Today's Message Index:
----------------------
1. 09:23 AM - 3 blade vs 2 blade (Richard Girard)
2. 10:59 AM - Help please - can't take off (cristalclear13)
3. 11:01 AM - Re: Vortex Generators (Thom Riddle)
4. 11:49 AM - Sat morn fly-out (zeprep251@aol.com)
5. 11:49 AM - Re: 3 blade vs 2 blade (John Hauck)
6. 11:53 AM - Re: Help please- can't take off (william sullivan)
7. 01:03 PM - Re: Help please - can't take off (zeprep251@aol.com)
8. 01:15 PM - Re: Help please - can't take off (Richard Girard)
9. 01:15 PM - Re: Help please - can't take off (cristalclear13)
10. 01:52 PM - Re: Re: Help please - can't take off (Jim Kmet)
11. 01:58 PM - Re: Re: Help please - can't take off (Carlos)
12. 03:37 PM - Re: Help please - can't take off (cristalclear13)
13. 04:34 PM - Re: Re: Help please - can't take off (Richard Girard)
14. 04:36 PM - Re: Re: Help please - can't take off (Jim Kmet)
15. 05:17 PM - Re: Help please - can't take off (zeprep251@aol.com)
16. 05:17 PM - Re: boom tube bolt question? (Arksey@aol.com)
17. 05:47 PM - Re: Re: boom tube bolt question? (robert bean)
18. 05:47 PM - Re: Help please - can't take off (Jack B. Hart)
19. 05:59 PM - Re: Help please - can't take off (cristalclear13)
20. 06:06 PM - Re: Help please - can't take off (cristalclear13)
21. 06:44 PM - Re: Help please - can't take off (Ralph B)
22. 06:48 PM - Re: boom tube bolt question? (Ralph B)
23. 07:55 PM - Re: Help please - can't take off (Richard Pike)
24. 11:20 PM - Re: Help please - can't take off ()
Message 1
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Subject: | 3 blade vs 2 blade |
Apparently my nervousness at testing the new prop led me to not notice just
how much more vibration was being generated. I put the three blade back
together yesterday and flew it this morning. Smoother. No measure of how
much, just a seat of the pants measurement.Almost all the tach problems went
away. There is still some oscillation of the needle at certain RPM's but
nothing like before.
I think the 7 hour old plugs are fouling a bit as the idle is getting
rougher. I'll put in new plugs and drop the needles one groove and see how
the next set of plugs does and if all tach problems go away.
On the flight testing program I validated what others have said here, that
the Mk III will not do a departure stall. At least I couldn't get it to do
one. I had the nose up so high it would have made the space shuttle proud.
All I could get was a vibration caused, I assume, by the flow separation at
the wing root that came and went as the flow separated and reattached at 37
mph IAS. Another data point to put in the log book.
Okay, out to change plugs and go up again before the storms arrive.
Rick Girard
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Subject: | Help please - can't take off |
[Crying or Very sad]
I put new choke seals on my Bing carbs. I am still having the same symptom...advance
the throttle and I can't get over 3500-4000rpm. This is the same symptom
she had before I took her apart. I took my carbs off and I thought the deteriorated
choke seal was the culprit causing it to run too rich so I replaced
it (and the other one at the same time even though it wasn't bad).
She is running real good at idle and slow taxi.
I took the air filter off and looked through the opening while it is not running
and can see that the cable is raising and opening up all the way at full throttle.
A technician made the suggestion to change my jets but I've flown with these jets
for over a year and a half now, through all seasons. I don't understand why
I would suddenly need to change the jets? While I had the carbs off I could
see the jets were not clogged.
I have a mechanical fuel pump so if it was that failing I would think I couldn't
even idle or taxi.
I put a new fuel filter in, just in case, but the old one wasn't clogged up at
all. I put new spark plugs in even though I probably didn't have to do that either.
What else?? What am I missing here? I wanna fly!
--------
Cristal Waters
Kolb Mark II Twinstar
Rotax 503 DCSI
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=263836#263836
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Subject: | Re: Vortex Generators |
This morning I was going to install VGs under the HS to see if I could get more
nose up pitch to enable an actual stall. As you may recall, with the VGs installed
I was able to get down to 42 mph IAS (no flaps) but ran out of elevator
and the SS wing was not stalled, just mushing with good roll control.
However, before doing this I decided to test the stall speed with 1/2 flaperons,
which is as deep as I ever lower them since the SS sinks at 900 fpm at idle
power and approach speed of 65 mph and no flaps. Before the VGs stall with 1/2
flaps was 42-43 mph IAS. I was astonished to learn today that with 1/2 flaps
and VGs, I had enough elevator to get an actual stall break at.... 34-35 mph IAS.
Since I can get a stall break at such a low speed with 1/2 flaps (my normal
landing and take-off configuration) I decided I didn't need to have a stall
break without flaps. Therefore, I'm not adding the HS VGs.
I am one very happy VG Kolber!
--------
Thom Riddle
Buffalo, NY
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x34
A complex system that works is invariably found to have evolved from a simple system
that works.
- John Gaule
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=263837#263837
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Subject: | Sat morn fly-out |
Hi List,
? One of those picture perfect Kolb flying days.Geauga County ( former home field
of CGS Hawk) airport days fly-in drive- in buggy-in breakfast. Lots of Amish
present with a ton of questions about?
the MK-3.Should have taken some pictures of all the kids sitting in it,but took
a few on the way up.
?Here are a couple of the guys flying in with us,and for a few of the younger crowd,a
picture of the infamous, Kent State University and their Dix Stadium sports
complex.
? Food was mediocer but still a great day.
??? G.Aman
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Subject: | Re: 3 blade vs 2 blade |
Rick G/Gang:
Most every Kolb I have flown will climb with the stick full back to the
stop, if it has any guts at all. Most of the time it will do it with
two aboard with a mkIII.
A good exercise to stay ahead of the airplane would be full power climbs
with the stick full back (at a safe altitude, of course), then chop the
throttle (to simulate engine failure), and see how long it takes to get
the nose down or recover from the stall, if that should happen.
john h
mkIII
Rock House, Oregon
On the flight testing program I validated what others have said here,
that the Mk III will not do a departure stall.
Rick Girard
Message 6
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Subject: | Re: Help please- can't take off |
- Cristal- Just for form's sake, check to see if your fuel line is collap
sed.- Mine was sucked flat from a deteriorated hose.-
-
-------------------------
--------------- Bill Sullivan
-------------------------
--------------- Windsor Locks, Ct.
-------------------------
--------------- FS 447
Message 7
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Subject: | Re: Help please - can't take off |
Cristal,
?When you reassembled the round slide,was the needle with the clip and o-ring the
first thing you put in the slide?
?G.Aman
-----Original Message-----
From: cristalclear13 <cristalclearwaters@gmail.com>
Sent: Sat, Sep 19, 2009 1:59 pm
Subject: Kolb-List: Help please - can't take off
[Crying or Very sad]
I put new choke seals on my Bing carbs. I am still having the same
symptom...advance the throttle and I can't get over 3500-4000rpm. This is the
same symptom she had before I took her apart. I took my carbs off and I thought
the deteriorated choke seal was the culprit causing it to run too rich so I
replaced it (and the other one at the same time even though it wasn't bad).
She is running real good at idle and slow taxi.
I took the air filter off and looked through the opening while it is not running
and can see that the cable is raising and opening up all the way at full
throttle.
A technician made the suggestion to change my jets but I've flown with these
jets for over a year and a half now, through all seasons. I don't understand
why I would suddenly need to change the jets? While I had the carbs off I could
see the jets were not clogged.
I have a mechanical fuel pump so if it was that failing I would think I couldn't
even idle or taxi.
I put a new fuel filter in, just in case, but the old one wasn't clogged up at
all. I put new spark plugs in even though I probably didn't have to do that
either.
What else?? What am I missing here? I wanna fly!
--------
Cristal Waters
Kolb Mark II Twinstar
Rotax 503 DCSI
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=263836#263836
Message 8
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Subject: | Re: Help please - can't take off |
Check tank venting. If you have an electric start pull the fuel line and
make sure your fuel pump is actually putting out a good stream of fuel. Is
your pulse line soft? Poor pulse will make your fuel pressure soft too. Have
you pulled the tank tap(s) to make sure you haven't pulled a piece of junk
into the fuel line from the tank end?
If you have room to pull off the runway after an aborted take off, let the
engine get to stumble rpm, shut it off and drop the float bowl(s) to see if
it's full of fuel or empty.
DO NOT start messing around changing jets. If you know for sure they're
clear that's all they can be, clogged or clear.
Rick Girard
On Sat, Sep 19, 2009 at 12:59 PM, cristalclear13 <
cristalclearwaters@gmail.com> wrote:
> cristalclearwaters@gmail.com>
>
> [Crying or Very sad]
> I put new choke seals on my Bing carbs. I am still having the same
> symptom...advance the throttle and I can't get over 3500-4000rpm. This is
> the same symptom she had before I took her apart. I took my carbs off and I
> thought the deteriorated choke seal was the culprit causing it to run too
> rich so I replaced it (and the other one at the same time even though it
> wasn't bad).
> She is running real good at idle and slow taxi.
>
> I took the air filter off and looked through the opening while it is not
> running and can see that the cable is raising and opening up all the way at
> full throttle.
>
> A technician made the suggestion to change my jets but I've flown with
> these jets for over a year and a half now, through all seasons. I don't
> understand why I would suddenly need to change the jets? While I had the
> carbs off I could see the jets were not clogged.
>
> I have a mechanical fuel pump so if it was that failing I would think I
> couldn't even idle or taxi.
>
> I put a new fuel filter in, just in case, but the old one wasn't clogged up
> at all. I put new spark plugs in even though I probably didn't have to do
> that either.
>
> What else?? What am I missing here? I wanna fly!
>
> --------
> Cristal Waters
> Kolb Mark II Twinstar
> Rotax 503 DCSI
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=263836#263836
>
>
Message 9
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Subject: | Re: Help please - can't take off |
williamtsullivan(at)att.n wrote:
> Cristal- Just for form's sake, check to see if your fuel line is collapsed.
Mine was sucked flat from a deteriorated hose.
> Bill Sullivan
>
Thanks for the reply Bill. My fuel line is in good shape.
A good friend wrote:
> What happens after you get the maximum power of 35 to 4000 rpm? Does the engine
run rough after you continue to increase throttle? or does the engine max out
smoothly at that power?
> I know you said throttle cable operation is fine, when its not running & you
are looking in carbs, but is it possible the Throttle cable end, (Either end,
in the plane or at splitter) slips, while the engine is running (Vibrating)?
>
When max power is reached it runs "sluggish". I don't know how else to describe
it. Maybe I can get a video with sound of it.
I don't know how I'd check to see if the throttle cable is slipping while it's
running. Could I tie it down and run it up with the air filters off and watch
it from the side (carefully away from the prop) while the throttle is advanced?
(Or would that make a mess or not run at all?)
What about the fan belt? This website:
http://www.ultralightnews.ca/rotax503/fanbeltadjustment.htm
says that a loose fan belt could cause loss of horsepower.
I've never been real good/accurate at checking the "proper 1/4 in deflection at
5 lbs pressure". They say to check it with your finger but how do I know when
I'm pushing at 5lbs of pressure? When I push it it seems to deflect at least
half an inch.
If that were the problem wouldn't it not run well at lower power settings too?
--------
Cristal Waters
Kolb Mark II Twinstar
Rotax 503 DCSI
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=263860#263860
Message 10
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Subject: | Re: Help please - can't take off |
Sluggish means it`s probably not the cables, probably one carb, or a fuel
supply problem.
Jim
----- Original Message -----
From: "cristalclear13" <cristalclearwaters@gmail.com>
Sent: Saturday, September 19, 2009 3:15 PM
Subject: Kolb-List: Re: Help please - can't take off
> <cristalclearwaters@gmail.com>
>
>
> williamtsullivan(at)att.n wrote:
>> Cristal- Just for form's sake, check to see if your fuel line is
>> collapsed. Mine was sucked flat from a deteriorated hose.
>> Bill Sullivan
>>
>
>
> Thanks for the reply Bill. My fuel line is in good shape.
>
>
> A good friend wrote:
>> What happens after you get the maximum power of 35 to 4000 rpm? Does the
>> engine run rough after you continue to increase throttle? or does the
>> engine max out smoothly at that power?
>> I know you said throttle cable operation is fine, when its not running &
>> you are looking in carbs, but is it possible the Throttle cable end,
>> (Either end, in the plane or at splitter) slips, while the engine is
>> running (Vibrating)?
>>
>
>
> When max power is reached it runs "sluggish". I don't know how else to
> describe it. Maybe I can get a video with sound of it.
>
> I don't know how I'd check to see if the throttle cable is slipping while
> it's running. Could I tie it down and run it up with the air filters off
> and watch it from the side (carefully away from the prop) while the
> throttle is advanced? (Or would that make a mess or not run at all?)
>
> What about the fan belt? This website:
> http://www.ultralightnews.ca/rotax503/fanbeltadjustment.htm
> says that a loose fan belt could cause loss of horsepower.
> I've never been real good/accurate at checking the "proper 1/4 in
> deflection at 5 lbs pressure". They say to check it with your finger but
> how do I know when I'm pushing at 5lbs of pressure? When I push it it
> seems to deflect at least half an inch.
> If that were the problem wouldn't it not run well at lower power settings
> too?
>
> --------
> Cristal Waters
> Kolb Mark II Twinstar
> Rotax 503 DCSI
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=263860#263860
>
>
>
Message 11
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Subject: | Re: Help please - can't take off |
Hi Cristal,
Sorry to hear about your "Tales of Woe" For what ever it's worth I'd would
check the engine compression to see if the engine is in good mechanical
conditon. Your compression should be around 160psi or so. It should also be
close to the same pressure for both cylinders.
What color are the spark plugs? If they are dark and or covered with soot
than you are getting too much fuel thru the engine. If the plugs are pale
tan to white then the engine is running too lean.
It could also be that one of the ignition coils is breaking down under load
or perhaps the spark is not reaching the plug. You might check for loose or
chafed ignition wires. A wet looking spark plug would indicate a lack of
ignition.
Hope this helps.
Carlos G
AKA
BaronVonEvil
----- Original Message -----
From: "cristalclear13" <cristalclearwaters@gmail.com>
Sent: Saturday, September 19, 2009 1:15 PM
Subject: Kolb-List: Re: Help please - can't take off
> <cristalclearwaters@gmail.com>
>
>
> williamtsullivan(at)att.n wrote:
>> Cristal- Just for form's sake, check to see if your fuel line is
>> collapsed. Mine was sucked flat from a deteriorated hose.
>> Bill Sullivan
>>
>
>
> Thanks for the reply Bill. My fuel line is in good shape.
>
>
> A good friend wrote:
>> What happens after you get the maximum power of 35 to 4000 rpm? Does the
>> engine run rough after you continue to increase throttle? or does the
>> engine max out smoothly at that power?
>> I know you said throttle cable operation is fine, when its not running &
>> you are looking in carbs, but is it possible the Throttle cable end,
>> (Either end, in the plane or at splitter) slips, while the engine is
>> running (Vibrating)?
>>
>
>
> When max power is reached it runs "sluggish". I don't know how else to
> describe it. Maybe I can get a video with sound of it.
>
> I don't know how I'd check to see if the throttle cable is slipping while
> it's running. Could I tie it down and run it up with the air filters off
> and watch it from the side (carefully away from the prop) while the
> throttle is advanced? (Or would that make a mess or not run at all?)
>
> What about the fan belt? This website:
> http://www.ultralightnews.ca/rotax503/fanbeltadjustment.htm
> says that a loose fan belt could cause loss of horsepower.
> I've never been real good/accurate at checking the "proper 1/4 in
> deflection at 5 lbs pressure". They say to check it with your finger but
> how do I know when I'm pushing at 5lbs of pressure? When I push it it
> seems to deflect at least half an inch.
> If that were the problem wouldn't it not run well at lower power settings
> too?
>
> --------
> Cristal Waters
> Kolb Mark II Twinstar
> Rotax 503 DCSI
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=263860#263860
>
>
>
Message 12
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Subject: | Re: Help please - can't take off |
I pulled out the Rotax repair manual and in the troubleshooting section it has
three conditions under the "no" answer for "Is the engine running well at high
speed?"
1. Engine "four-stroking"
2. Backfiring through carb
3. Prevailing pinking of engine
and it lists lots of possible faults under each one of those.
However...I don't know which section applies to my engine, except I don't hear
any backfiring.
This is something that started at the beginning of summer (June when I flew my
dad to Douglas and some thought it was carb ice upon landing), but it just happened
once or twice since then and things would go back to normal after pulling
the throttle back to idle and then advancing it again. But it has just recently
gotten so bad it doesn't clear up on its own.
That choke seal was probably bad since I had it because that spark plug would always
come out black and wet. Maybe something is messed up from running too rich
for so long. The repair manual mentions exhaust port or exhaust pipe blocked
by deposits. (That is the exhaust that has been leaking, but it didn't look
blocked when I had it off a month or two ago.) It also mentions heavy carbon
deposits in combustion chamber causing pre-ignition. (When I look in through
the spark plug hole the middle of the top of the piston head looks clean but
the sides of the top of the piston head look black from what I could see.)
Anyone know what "four-stroking" vs "pinking" is?
--------
Cristal Waters
Kolb Mark II Twinstar
Rotax 503 DCSI
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=263873#263873
Message 13
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Subject: | Re: Help please - can't take off |
Cristal, Two stroke engines fire the plug each time the piston comes to the
top of its stroke. When it is four stroking it is missing. It usually
happens when the mixture is so rich that the plug can't spark. Pinking is
the same as pinging, ie cylinder has a hot spot that is causing combustion
to begin before the plug fires. Usually caused by a lean mixture while
loading the engine excessively.
Rick Girard
On Sat, Sep 19, 2009 at 5:37 PM, cristalclear13 <
cristalclearwaters@gmail.com> wrote:
> cristalclearwaters@gmail.com>
>
> I pulled out the Rotax repair manual and in the troubleshooting section it
> has three conditions under the "no" answer for "Is the engine running well
> at high speed?"
> 1. Engine "four-stroking"
> 2. Backfiring through carb
> 3. Prevailing pinking of engine
>
> and it lists lots of possible faults under each one of those.
> However...I don't know which section applies to my engine, except I don't
> hear any backfiring.
>
> This is something that started at the beginning of summer (June when I flew
> my dad to Douglas and some thought it was carb ice upon landing), but it
> just happened once or twice since then and things would go back to normal
> after pulling the throttle back to idle and then advancing it again. But it
> has just recently gotten so bad it doesn't clear up on its own.
>
> That choke seal was probably bad since I had it because that spark plug
> would always come out black and wet. Maybe something is messed up from
> running too rich for so long. The repair manual mentions exhaust port or
> exhaust pipe blocked by deposits. (That is the exhaust that has been
> leaking, but it didn't look blocked when I had it off a month or two ago.)
> It also mentions heavy carbon deposits in combustion chamber causing
> pre-ignition. (When I look in through the spark plug hole the middle of the
> top of the piston head looks clean but the sides of the top of the piston
> head look black from what I could see.)
>
> Anyone know what "four-stroking" vs "pinking" is?
>
> --------
> Cristal Waters
> Kolb Mark II Twinstar
> Rotax 503 DCSI
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=263873#263873
>
>
Message 14
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Subject: | Re: Help please - can't take off |
Back in My old R/C flying days, we called 4 stroking an excessively rich
mixture. One thing I recall reading in the Mike Stratman columns was that if
you experienced a rough running engine, pulling the choke lever during this
time could help in determining the problem, in that if it got worse, it was
already recieving to much fuel before the enricher ciciut was open, & if it
ran better, it was starving for fuel. This might help in the diagnosis, but
wouldn`t solve it of course. I don`t remember if you said if you talked to
Ronnie yet, But That seems to be what`s next.
??
Jim
----- Original Message -----
From: "cristalclear13" <cristalclearwaters@gmail.com>
Sent: Saturday, September 19, 2009 5:37 PM
Subject: Kolb-List: Re: Help please - can't take off
> <cristalclearwaters@gmail.com>
>
> I pulled out the Rotax repair manual and in the troubleshooting section it
> has three conditions under the "no" answer for "Is the engine running well
> at high speed?"
> 1. Engine "four-stroking"
> 2. Backfiring through carb
> 3. Prevailing pinking of engine
>
> and it lists lots of possible faults under each one of those.
> However...I don't know which section applies to my engine, except I don't
> hear any backfiring.
>
> This is something that started at the beginning of summer (June when I
> flew my dad to Douglas and some thought it was carb ice upon landing), but
> it just happened once or twice since then and things would go back to
> normal after pulling the throttle back to idle and then advancing it
> again. But it has just recently gotten so bad it doesn't clear up on its
> own.
>
> That choke seal was probably bad since I had it because that spark plug
> would always come out black and wet. Maybe something is messed up from
> running too rich for so long. The repair manual mentions exhaust port or
> exhaust pipe blocked by deposits. (That is the exhaust that has been
> leaking, but it didn't look blocked when I had it off a month or two ago.)
> It also mentions heavy carbon deposits in combustion chamber causing
> pre-ignition. (When I look in through the spark plug hole the middle of
> the top of the piston head looks clean but the sides of the top of the
> piston head look black from what I could see.)
>
> Anyone know what "four-stroking" vs "pinking" is?
>
> --------
> Cristal Waters
> Kolb Mark II Twinstar
> Rotax 503 DCSI
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=263873#263873
>
>
>
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Subject: | Re: Help please - can't take off |
Cristal,
?Make certain that the gaskets on the intake and on the exhaust are properly in
place.Check to see if one of the spark plugs is wetter,darker than the other.?
You have points ignition I believe,so you may have to check there also .
?G.Aman
-----Original Message-----
From: cristalclear13 <cristalclearwaters@gmail.com>
Sent: Sat, Sep 19, 2009 1:59 pm
Subject: Kolb-List: Help please - can't take off
[Crying or Very sad]
I put new choke seals on my Bing carbs. I am still having the same
symptom...advance the throttle and I can't get over 3500-4000rpm. This is the
same symptom she had before I took her apart. I took my carbs off and I thought
the deteriorated choke seal was the culprit causing it to run too rich so I
replaced it (and the other one at the same time even though it wasn't bad).
She is running real good at idle and slow taxi.
I took the air filter off and looked through the opening while it is not running
and can see that the cable is raising and opening up all the way at full
throttle.
A technician made the suggestion to change my jets but I've flown with these
jets for over a year and a half now, through all seasons. I don't understand
why I would suddenly need to change the jets? While I had the carbs off I could
see the jets were not clogged.
I have a mechanical fuel pump so if it was that failing I would think I couldn't
even idle or taxi.
I put a new fuel filter in, just in case, but the old one wasn't clogged up at
all. I put new spark plugs in even though I probably didn't have to do that
either.
What else?? What am I missing here? I wanna fly!
--------
Cristal Waters
Kolb Mark II Twinstar
Rotax 503 DCSI
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=263836#263836
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Subject: | Re: boom tube bolt question? |
Hi group,
I was looking over the boom tube on my firestar ll the other day and
got to wondering if a person should remove the large bolt that goes thru the
boom tube where it attaches to the rear of the cockpit cage when a person
does a annual inspection to see if the bolt is ok. Do you think it is
necessary to do that? I have been doing a lot of flying the last couple of
weeks, weather is good up here in Michigan...went to fly in last weekend and
meeting some people today for lunch today. The firestar is getting a work
out, already been over to a breakfast get together for coffee and donuts,
cool ride even with a coat this morning at 9 am. thanks in advance....jswan
do not archive
JIM SWAN
firestar ll, 503, N663S
Eaton Rapids, Mi. 48827
PH 517-663-8488 runway 2300' E & W (42-28.58N 084-44.69 W )
Message 17
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Subject: | Re: boom tube bolt question? |
Jim, it would be interesting to do a one time inspection after
several hundred hours and report to the list.
I doubt that bolt would show anything unless it was loose and
spinning around. Better to check what visible rivets
you can see on the tube, cracks around them, etc. The bolt goes in a
sleeve built into the H-frame.
The rivets inside the cage are tougher to see. The bolt mount area
on the cage is usually covered with enough paint (or fabric) that
visual inspection can't reveal any early problems. Maybe some owners
who have done some damage could report
what failed first.
The Kolb's H-frame is designed to taper the load at the boom and on
the spars. The Rans aircraft didn't
have this feature and had a few shear failures on their tails.
BB
On 19, Sep 2009, at 7:55 PM, Arksey@aol.com wrote:
>
> Hi group,
> I was looking over the boom tube on my firestar ll the other
> day and got to wondering if a person should remove the large bolt
> that goes thru the boom tube where it attaches to the rear of the
> cockpit cage when a person does a annual inspection to see if the
> bolt is ok. Do you think it is necessary to do that? I have been
> doing a lot of flying the last couple of weeks, weather is good up
> here in Michigan...went to fly in last weekend and meeting some
> people today for lunch today. The firestar is getting a work out,
> already been over to a breakfast get together for coffee and
> donuts, cool ride even with a coat this morning at 9 am. thanks in
> advance....jswan
>
> do not archive
>
> JIM SWAN
> firestar ll, 503, N663S
> Eaton Rapids, Mi. 48827
> PH 517-663-8488 runway 2300' E & W (42-28.58N 084-44.69 W )
>
>
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Subject: | Re: Help please - can't take off |
At 10:59 AM 9/19/09 -0700, you wrote:
>
Cristal,
Since this has been a slow onset, it may be caused by carbon build up under
the rings. When was the last time the engine was
decarbed?
You have mentioned that one choker seal was bad and one cylinder was running
rich. What happens is the carbon or coke can build up under the ring. This
prevents the ring from expanding back into the slot. As the engine runs at
higher speed, the ring, piston and cylinder all heat up. The aluminum
piston expands faster than the cast iron cylinder. With the carbon under
the ring the steel ring cannot move deeper into the slot and the ring is
forced out against the cylinder. If the carbon is severe enough this force
will become high enough (drag) to prevent the engine from running
faster.
It might be best to pull the heads and cylinders, and to check for carbon
under the rings. If you do not find any all well and good. If you do you
may prevent scoring the piston and cylinder.
FWIW
Jack B. Hart FF004
Winchester, IN
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Subject: | Re: Help please - can't take off |
aslsa.rng(at)gmail.com wrote:
> Cristal, Two stroke engines fire the plug each time the piston comes to the top
of its stroke. When it is four stroking it is missing. It usually happens when
the mixture is so rich that the plug can't spark. Pinking is the same as pinging,
ie cylinder has a hot spot that is causing combustion to begin before
the plug fires. Usually caused by a lean mixture while loading the engine excessively.
>
> Rick Girard
>
>
Ok, I'm not pinging and not backfiring so looking at the possible faults for "four-stroking":
a.) Clogged airfilter element (I don't know how much you can tell by looking, but
it doesn't look clogged. Maybe I'll go ahead and clean it.)
b.) Worn needle jet (I can take it apart and see how that looks)
c.) Carb jets too large (I have the standard sizes, but Ronnie did suggest dropping
from 158 to 155 and 45 to 40 back when I first called him. I didn't call
him today because I heard he was on vacation. I only have Saturdays to work
on my plane, makes it hard to find help.)
d.) Mixture too rich (I thought fixing the choke seal would fix this.)
e.) Wrong ignition timing (I'd have to take it somewhere to check this, but I could
look at the wiring as Carlos suggested)
f.) Exhaust port or exhaust pipe blocked by deposits (I could take the muffler
off. I've been meaning to put on the muffler I got from Jimmy anyways.)
g.) Needle position too high (The o-ring is on the top slot of the needle and the
clip is in the second slot.)
h.) Choke activated (It is not activated. When I activate it it runs rough.)
i.) Float stuck or faulty (I will have to investigate this further.)
Thanks for your tips and suggestions. Now I just need some cooler weather to work
in the hanger comfortably and some extra Saturdays in the week. :)
--------
Cristal Waters
Kolb Mark II Twinstar
Rotax 503 DCSI
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=263896#263896
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Subject: | Re: Help please - can't take off |
jbhart(at)onlyinternet.ne wrote:
>
> Cristal,
>
> Since this has been a slow onset, it may be caused by carbon build up under
> the rings. When was the last time the engine was
> decarbed?
>
> You have mentioned that one choker seal was bad and one cylinder was running
> rich. What happens is the carbon or coke can build up under the ring. This
> prevents the ring from expanding back into the slot. As the engine runs at
> higher speed, the ring, piston and cylinder all heat up. The aluminum
> piston expands faster than the cast iron cylinder. With the carbon under
> the ring the steel ring cannot move deeper into the slot and the ring is
> forced out against the cylinder. If the carbon is severe enough this force
> will become high enough (drag) to prevent the engine from running
> faster.
>
> It might be best to pull the heads and cylinders, and to check for carbon
> under the rings. If you do not find any all well and good. If you do you
> may prevent scoring the piston and cylinder.
>
> FWIW
>
> Jack B. Hart FF004
> Winchester, IN
That makes sense Jack. I don't have the tools to do this so I may just take her
down to Gerry at Green Sky. He is closer to me than Ronnie. I trust them both.
--------
Cristal Waters
Kolb Mark II Twinstar
Rotax 503 DCSI
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=263898#263898
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Subject: | Re: Help please - can't take off |
Cristal, make sure the jet needle and clip are under the white cup in the carb
slide. It's easy to get it on top which would make it run very rich and give you
the problem that you are seeing.
Ralph B
--------
Ralph B
Original Firestar 447
N91493 E-AB
970 hours
22 years flying it
Kolbra 912UL
N20386
1 year flying it
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=263902#263902
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Subject: | Re: boom tube bolt question? |
I removed the main fuse tube bolt after 19 years of flying and found absolutely
no wear.
Ralph B
--------
Ralph B
Original Firestar 447
N91493 E-AB
970 hours
22 years flying it
Kolbra 912UL
N20386
1 year flying it
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=263903#263903
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Subject: | Re: Help please - can't take off |
[/quote]
Ok, I'm not pinging and not backfiring so looking at the possible faults for "four-stroking":
a.) Clogged airfilter element (I don't know how much you can tell by looking, but
it doesn't look clogged. Maybe I'll go ahead and clean it.)
b.) Worn needle jet (I can take it apart and see how that looks)
c.) Carb jets too large (I have the standard sizes, but Ronnie did suggest dropping
from 158 to 155 and 45 to 40 back when I first called him. I didn't call
him today because I heard he was on vacation. I only have Saturdays to work
on my plane, makes it hard to find help.)
d.) Mixture too rich (I thought fixing the choke seal would fix this.)
e.) Wrong ignition timing (I'd have to take it somewhere to check this, but I could
look at the wiring as Carlos suggested)
f.) Exhaust port or exhaust pipe blocked by deposits (I could take the muffler
off. I've been meaning to put on the muffler I got from Jimmy anyways.)
g.) Needle position too high (The o-ring is on the top slot of the needle and the
clip is in the second slot.)
h.) Choke activated (It is not activated. When I activate it it runs rough.)
i.) Float stuck or faulty (I will have to investigate this further.)
Thanks for your tips and suggestions. Now I just need some cooler weather to work
in the hanger comfortably and some extra Saturdays in the week. :)[/quote]
Cristal, one of the guys mentioned that you have points - Ka-Ching! Check your
points, as they wear down, the timing retards, the engine runs smooth, but won't
rev up. The problems you describe are exactly what happened to me a number
of years ago when I still had my 532 on the MKIII. I bought a set of points from
a company that (hopefully) is no longer in business, Airstar Discount Sales.
Installed the points the week before leaving for Oshkosh, flew for several hours,
and checked them. OK. By the time we got to Illinois, the engine was running
exactly like yours. It never occurred to me that the points could have been
wearing down that fast, so I repitched the prop to allow the engine to rev
up and we kept going.
Spent most of my time at Oshkosh fooling around with the engine, but didn't check
the points. (duh) By the time we got back to Illinois heading south, I was
really getting tired of repitching the prop, and the two Maxair Drifters were
no longer the slowest airplanes of our threesome...
Finally one of the other guys suggested that I check the points, and they had worn
excessively and quickly. Reset them and added a hair because I knew they would
keep wearing, repitched the prop again, (sigh) back to normal and continued
home without incident.
Perhaps it is as simple as that. Good luck.
Richard Pike
MKIII N420P (420ldPoops)
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http://forums.matronics.com/viewtopic.php?p=263916#263916
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Subject: | Re: Help please - can't take off |
Have you tried running it with the airfilter off. If the airfilter gets
gloged with oil it will limit RPM. have had this happen a few times.
Regards
Tony
Downunder
MK111c
----- Original Message -----
From: "cristalclear13" <cristalclearwaters@gmail.com>
Sent: Sunday, September 20, 2009 5:59 AM
Subject: Kolb-List: Help please - can't take off
> <cristalclearwaters@gmail.com>
>
> [Crying or Very sad]
> I put new choke seals on my Bing carbs. I am still having the same
> symptom...advance the throttle and I can't get over 3500-4000rpm. This is
> the same symptom she had before I took her apart. I took my carbs off and
> I thought the deteriorated choke seal was the culprit causing it to run
> too rich so I replaced it (and the other one at the same time even though
> it wasn't bad).
> She is running real good at idle and slow taxi.
>
> I took the air filter off and looked through the opening while it is not
> running and can see that the cable is raising and opening up all the way
> at full throttle.
>
> A technician made the suggestion to change my jets but I've flown with
> these jets for over a year and a half now, through all seasons. I don't
> understand why I would suddenly need to change the jets? While I had the
> carbs off I could see the jets were not clogged.
>
> I have a mechanical fuel pump so if it was that failing I would think I
> couldn't even idle or taxi.
>
> I put a new fuel filter in, just in case, but the old one wasn't clogged
> up at all. I put new spark plugs in even though I probably didn't have to
> do that either.
>
> What else?? What am I missing here? I wanna fly!
>
> --------
> Cristal Waters
> Kolb Mark II Twinstar
> Rotax 503 DCSI
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=263836#263836
>
>
>
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