Today's Message Index:
----------------------
1. 06:37 AM - Re: Re: New alternate engine on my MKIII (frank.goodnight)
2. 07:28 AM - Re: New alternate engine on my MKIII (lucien)
3. 07:42 AM - Re: Deviation cards (pj.ladd)
4. 10:26 AM - FireWorks (possums)
5. 10:43 AM - Lexan windshield question (Rex Rodebush)
6. 10:51 AM - Re: New alternate engine on my MKIII (dalewhelan)
7. 11:10 AM - Re: FireWorks (Jim Kmet)
8. 11:24 AM - Re: Lexan windshield question (robert bean)
9. 12:31 PM - Re: FireWorks (possums)
10. 01:24 PM - Re: Lexan windshield question (Mike Welch)
11. 03:33 PM - Re: FireWorks (Richard Girard)
12. 05:27 PM - Re: FireWorks (russ kinne)
13. 06:58 PM - Re: Lexan windshield question (John Bickham)
14. 08:08 PM - Re: New alternate engine on my MKIII (dalewhelan)
Message 1
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Subject: | Re: New alternate engine on my MKIII |
Hi,
Re RPM- Seems like I remember from some school I attended a long
time ago , that RPM
doesn't have much to do with engine life . Piston speed is what
counts. Short stroke and
high Rpm equal a certin piston speed and a longer stroke and lower Rpm
can equal the
same piston speed.As long as the engine is balanced and the parts are
built to take the
stress of the piston starting and stopping- No problem. Of course the
valve train is there
to be worried about.
I'm not trying to present the above as a fact, Only thats what I
was taught I don't even
remember what school I was in, some navy school I think. But it made
sense the way it was explaned to me.
Frank Goodnight
FireStar 4 stroke
On Jul 3, 2009, at 8:07 PM, JetPilot wrote:
>
> I doubt the engine would last long at 7000 RPM. On a snowmobile,
> they use full throttle in short bursts, very little time is actually
> spent at 7000 RPM. Think about it, a 120 HP snowmobile would be up
> to over 100 MPH in about 5 seconds at full throttle, most time is
> spent at far less RPM and power. That being said, maybe the Yamaha
> engine would last a long time if it were limited to 100 HP and maybe
> 5500 RPM on a Kolb. One other thing I really like about this
> conversion is the Rotax Gearbox, that should solve a lot of
> potential problems right there. This sounds like a very interesting
> alternative engine, I hope it works out ! Please keep the
> information coming, a lot of people will be interested in how this
> engine works for you.
>
> Mike
>
> --------
> "NO FEAR" - If you have no fear you did not go as fast as
> you could have !!!
>
> Kolb MK-III Xtra, 912-S
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=251391#251391
>
>
Message 2
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Subject: | Re: New alternate engine on my MKIII |
frank.goodnight(at)att.ne wrote:
> Hi,
>
> Re RPM- Seems like I remember from some school I attended a long
> time ago , that RPM
> doesn't have much to do with engine life . Piston speed is what
> counts. Short stroke and
> high Rpm equal a certin piston speed and a longer stroke and lower Rpm
> can equal the
> same piston speed.As long as the engine is balanced and the parts are
> built to take the
> stress of the piston starting and stopping- No problem. Of course the
> valve train is there
> to be worried about.
>
> I'm not trying to present the above as a fact, Only thats what I
> was taught I don't even
> remember what school I was in, some navy school I think. But it made
> sense the way it was explaned to me.
>
> Frank Goodnight
> FireStar 4 stroke
> On Jul 3, 2009, at 8:07 PM, JetPilot wrote:
>
>
It's probably more how hard you work a lump of metal of a given size. In a very
general way, the more power you try to extract out of an engine, the lower it's
reliability and/or TBO.
This is just a simple function of the extra stresses you impose on it as the power
output goes up. More stress put on the bearings, rods, more sideloads on
the piston against the cylinder walls, etc.
I.e. the 912 series are so reliable because they're generally not nearly as suped
up as they could be in other applications. Even tho they spin at 5000 to 5500
on a continuous basis, they can go all the way out to TBO at those rpms because
they're "only" producing 80 to 90bhp.
Same with the rotax 2-strokes. The original sno-mo 503 that the current 503 was
based on was, IIRC, rated at 75bhp. The 582 was derived from an engine that put
out nearly 100bhp (this is all from old memory so I'm hoping I'm remembering
this right). The current a/c motors, of course are significantly detuned over
the old engines (mainly due to the exhaust used) and are even beefier in the
bottom end. That's partly why they work in a continuous-duty environment.
As for conversions, you can actually get a good bit of continuous-duty reliability
out of them by simply running them less hard than they're capable of assuming
you still have a good power to weight at the lower power settings. I.e. the
mazda rotary conversions are becoming pretty successful because they're tough
as stink to begin with but can also still produce good power/weight ratios at
power settings they can run for a long time at. That's all putting aside the
installation issues, of course.
In fact, the main killer of auto conversions is insurance, not the engines themselves.
The insurance companies are more powerful than FAA when it comes to the
rules of flight we have to fly under; auto conversions that don't have some
person or business behind them that they can dishonorably sue generally can't
get affordable insurance coverage if they can get it at all.
LS
--------
LS
Titan II SS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=251447#251447
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Subject: | Re: Deviation cards |
My FAA Designee was not interested in my compass card,>>
Hi John,
I have never seen a microlight in the UK with a decent compass let alone a
deviation card. Most have a stick on car compass which may be good to the
nearest 5 degrees. I dont think most light aircraft pilots can fly within 3
degrees anyway and in a very light a/c like ours it is even more difficult.
Difficult, but not impossible to get lost here in the UK. You just lose
height and read the pub signs. Most pilots know every pub within 50 miles.
I have a mate who is a raiIway buff and he will suddenly point and say
"Look at that. That straight hedge is where the old line from Bratchester to
Oxbridge used to run.The line was taken up in 1956 but that town over there
must be....etc..All knowledge is useful.
Cheers
Pat
Message 4
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Anyone ever see a fireworks display from the air? (Flak don't count
in this case).
Thinking about flying up the road to tonight/afternoon if it
starts early enough. It's at the horse track west of our field we sometimes
fly around. Should make some good pictures from the air?
"One-of-a-kind Fourth of July celebration, with integrated, simultaneous
fireworks, show horses, pony rides and RC planes all in a rural setting.
If you're planning to attend we will start early, and don't be
in a hurry to leave as it can take an hour or more to clear roadways
after the show. This huge low-level show, which you're not going to see
in a big city skyline, can be much more up close and impressive."
http://www.atlantasteeplechase.org/
Message 5
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Subject: | Lexan windshield question |
I'm fitting up the windshield. Do I just push it down and attach along the sides?
I can do this but it takes a fair amount of pressure. Does anyone use heat
to reduce the tension?
Thanks,
Rex Rodebush
Mark III X-tra
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=251478#251478
Message 6
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Subject: | Re: New alternate engine on my MKIII |
Some things about the Yamaha motor
It is loosely related to a Yamaha R-1, very loosely.
I have seen a few of those in street trim loose connecting rods.
I have ridden people around race track at speeds of 160MPH with no problems.
The snow mobile motor chosen here is lower RPM that an R-1 or RX-1 snow mobile
motor.
The area I would be worried about is the fact that the motor has a cam chain and
a tensioner for that chain that I have often seen go bad.
Many automatic cam chain tensioners fail, I regularly replace them with APE manual
tensioners.
The valve train is a shim and bucket design, I expect you will never wear out the
valve guides.
You may contact Dyno-Jet for carb tuning components, my experience has been that
you can usually get the motors to run well with th components provided. I you
follow the directions exactly, you will have some tuning to do. Apologies to
the engineers that designed the kits.
I have also found that most often fuel economy is noticeably reduced, throttle
response is better, top end power is similar, mid range power is sometimes increased,
some times the only difference is throttle response.
Just for the record, I used to teach Yamaha snowmobiles, 2 and 4 stroke motor performance
tuning and Dyno Jet operation.
The factors I look at for a motors life are
BMEP, Crank, rods, pins, bearings, cases, cylinder head hold down.
Piston speed, Piston, rings
Piston acceleration, ring flutter
RPM valve train wear
>From what math I have done the people at Yamaha build good stuff. The piston speeds
are higher than what used to be thought possible.
Yamaha has built motors the end up in show rooms with piston speeds in the area
of 4,500 feet per minute.
I am suspect of the 1000 4 cylinder and the 500 twin, I think the triple is the
best choice of those motors and am very interested in how it works for you.
I kinda like the idea of Jet ski motors, the piston to cylinder clearance is Too
high, but the jet pumps only work to about 6,000 RPM so the 2 stroke motors
are tuned for that speed, a good match for the 2.58 Rotax gear box and the prop
I use.
The four stroke boat motors are gear reduced.
The carbs or fuel injection system are far less effected by negative Gs if you
ever got an aerobatic inclination.
--------
Dale Whelan
503 powered Firestar II
Projection, A simple and interesting Psychological concept
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=251479#251479
Message 7
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2 Years ago, I took my wife & 2 daughters in a C-182 up at dark & circled
slowly while the town`s fireworks display went on for twenty minutes. They
still tell all their friends about how cool it was. I recommend to anyone,
if you get the chance, do it!
Jim Kmet
MK-3C
Cookeville, TN
----- Original Message -----
From: "possums" <possums@bellsouth.net>
Sent: Saturday, July 04, 2009 12:26 PM
Subject: Kolb-List: FireWorks
>
> Anyone ever see a fireworks display from the air? (Flak don't count in
> this case).
> Thinking about flying up the road to tonight/afternoon if it
> starts early enough. It's at the horse track west of our field we
> sometimes
> fly around. Should make some good pictures from the air?
>
>
> "One-of-a-kind Fourth of July celebration, with integrated, simultaneous
> fireworks, show horses, pony rides and RC planes all in a rural setting.
> If you're planning to attend we will start early, and don't be
> in a hurry to leave as it can take an hour or more to clear roadways
> after the show. This huge low-level show, which you're not going to see
> in a big city skyline, can be much more up close and impressive."
>
> http://www.atlantasteeplechase.org/
>
>
>
Message 8
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Subject: | Re: Lexan windshield question |
My windshield is non standard but...
Do one side first, (should be zero resistance) then push it down to
the other side and clamp it before drilling.
BB
On 4, Jul 2009, at 1:42 PM, Rex Rodebush wrote:
>
> I'm fitting up the windshield. Do I just push it down and attach
> along the sides? I can do this but it takes a fair amount of
> pressure. Does anyone use heat to reduce the tension?
>
> Thanks,
>
> Rex Rodebush
> Mark III X-tra
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=251478#251478
>
>
Message 9
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At 02:09 PM 7/4/2009, you wrote:
>
>2 Years ago, I took my wife & 2 daughters in a C-182 up at dark &
>circled slowly while the town`s fireworks display went on for twenty
>minutes. They still tell all their friends about how cool it was. I
>recommend to anyone, if you get the chance, do it!
>Jim Kmet
That settles it then, what could possible go wrong.
Message 10
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Subject: | Lexan windshield question |
Hi Rex=2C
Bob's right about attaching one side first (with clecos). Then=2C bend t
he windshield in place=2C and drill the opposite side. Do NOT use any heat
!! The Lexan is so tough=2C I doubt you could break it by bending it.
A couple pointers=3B
When attaching my Lexan=2C after fastening the first side with clecos=2C
I noticed the opposite side post wanted to deform from it's normal position
when trying to bend the Lexan in place=2C and secure it with clamps. My s
olution was to secure a couple of temporary cross braces between the posts
=2C thereby helping to insure the installation of the Lexan didn't distort
the side posts when clamping it in place.
I decided to predrill the side posts before attaching the Lexan. It is v
ery easy to see the underlying hole in the post=2C and then drill each Lexa
n hole=2C cleco-ing as you go. Since the Lexan hole is supposed to be over
sized anyway=2C there isn't much of a problem if you are off a little with
your Lexan holes.
Mike Welch
MkIII turbo GEO
> Subject: Kolb-List: Lexan windshield question
> From: rrodebush@tema.net
> Date: Sat=2C 4 Jul 2009 10:42:44 -0700
> To: kolb-list@matronics.com
>
>
> I'm fitting up the windshield. Do I just push it down and attach along th
e sides? I can do this but it takes a fair amount of pressure. Does anyone
use heat to reduce the tension?
>
> Thanks=2C
>
> Rex Rodebush
> Mark III X-tra
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=251478#251478
>
>
>
>
>
>
>
===========
===========
===========
===========
>
>
>
_________________________________________________________________
Hotmail=AE has ever-growing storage! Don=92t worry about storage limits.
http://windowslive.com/Tutorial/Hotmail/Storage?ocid=TXT_TAGLM_WL_HM_Tuto
rial_Storage_062009
Message 11
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When I was in high school many years ago I worked as a line boy for a flying
club at KFUL. One of the members took his out of town in laws up to see the
lights of the city and just happened to be over Disneyland at 9:00 pm. When
the fireworks show started one of those big shells went off right under his
right wing. Next day there was a notice on the bulletin board warning all
the other pilots to "Watch out for flak over Disneyland".
Rick
do not archive
On Sat, Jul 4, 2009 at 2:28 PM, possums <possums@bellsouth.net> wrote:
>
> At 02:09 PM 7/4/2009, you wrote:
>
>>
>> 2 Years ago, I took my wife & 2 daughters in a C-182 up at dark & circled
>> slowly while the town`s fireworks display went on for twenty minutes. They
>> still tell all their friends about how cool it was. I recommend to anyone,
>> if you get the chance, do it!
>> Jim Kmet
>>
>
>
> That settles it then, what could possible go wrong.
>
>
Message 12
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Dare I say "out of town in-laws" are better than "in-town outlaws???"
On Jul 4, 2009, at 6:32 PM, Richard Girard wrote:
> When I was in high school many years ago I worked as a line boy for
> a flying club at KFUL. One of the members took his out of town in
> laws up to see the lights of the city and just happened to be over
> Disneyland at 9:00 pm. When the fireworks show started one of those
> big shells went off right under his right wing. Next day there was
> a notice on the bulletin board warning all the other pilots to
> "Watch out for flak over Disneyland".
>
> Rick
> do not archive
>
> On Sat, Jul 4, 2009 at 2:28 PM, possums <possums@bellsouth.net> wrote:
>
> At 02:09 PM 7/4/2009, you wrote:
>
> 2 Years ago, I took my wife & 2 daughters in a C-182 up at dark &
> circled slowly while the town`s fireworks display went on for
> twenty minutes. They still tell all their friends about how cool
> it was. I recommend to anyone, if you get the chance, do it!
> Jim Kmet
>
>
> That settles it then, what could possible go wrong.
>
> ==========
> arget="_blank">http://www.matronics.com/Navigator?Kolb-List
> ==========
> http://forums.matronics.com
> ==========
> le, List Admin.
> ="_blank">http://www.matronics.com/contribution
> ==========
>
>
Message 13
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Subject: | Re: Lexan windshield question |
On my last lexan replacement I used the small ratcheting straps to pull the lexan
down for drilling and clecoing. Of course, you need to use the appropriate
padding to avoid scratches to lexan and damage to fabric. This helped with the
problem that Mike W pointed out with a lot of pressure on clecos and clamps.
Made the one man job a bit easier for me anyway.
Next replacement gotta put clear tape under door hinges. Helps keep the water
out when caught in those light rains on those XC flights. John H and John W trick!
Wouldn't use heat but might do it in the sun!
--------
Thanks too much,
John Bickham
Mark III-C w/ 912UL
St. Francisville, LA
I know many pilots and a few true aviators. There is a distinct difference that
I have the greatest respect for.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=251532#251532
Message 14
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Subject: | Re: New alternate engine on my MKIII |
Forgot to mention, valve wear has been an issue with many Yamaha 5 valve motors.
Just check the clearance, if they start to tighten up you may want to replace
the valves. They get tighter as they wear and will not make noise.
If you need the valve seats cut I can do that for you.
--------
Dale Whelan
503 powered Firestar II
Projection, A simple and interesting Psychological concept
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=251540#251540
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