Today's Message Index:
----------------------
1. 08:57 AM - Re: Carb Problem (Ellery Batchelder Jr)
2. 09:16 AM - Re: Carb Problem (pcking)
3. 11:56 AM - Re: Carb Problem (Richard Girard)
4. 12:27 PM - Re: New Firestar II owner - question about elevator oscillations (EricS)
5. 02:08 PM - Re: New Firestar II owner - question about elevator oscillations (EricS)
6. 02:19 PM - Re: New Firestar II owner - question about elevator oscillations (Jack B. Hart)
7. 02:21 PM - Re: Re: New Firestar II owner - question about elevator oscillations (John Hauck)
8. 05:03 PM - Re: Carb Problem (Ellery Batchelder Jr)
9. 08:38 PM - Re: New Firestar II owner - question about elevator oscillations (Richard Pike)
Message 1
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Subject: | Re: Carb Problem |
I have a 912 Rotax ULS 80 Hp on a Kolb MK3Classic and fuel is running out
of the vent line on one carb what should I look for to stop this?
Message 2
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Subject: | Re: Carb Problem |
If it's like most carbs, the vent is on the float chamber.
Either your float is full of fuel and no longer holding the needle in
the seat, or there is a bit of crud under the needle holding it open.
I suspect the latter.
You probably should clean your tank and lines when you open the carb.
----- Original Message -----
From: Ellery Batchelder Jr
To: kolb-list@matronics.com
Sent: Thursday, July 26, 2012 11:57 AM
Subject: Re: Kolb-List: Carb Problem
I have a 912 Rotax ULS 80 Hp on a Kolb MK3Classic and fuel is running
out of the vent line on one carb what should I look for to stop this?
Message 3
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Subject: | Re: Carb Problem |
Ellery, In addition to checking the floats and needle valve, check to see
that all passages from the float chamber to the carb throat are clear. Did
the engine sit for awhile? The crud in present day fuel makes a compound
that can seal those small, drilled passages like you'd poured epoxy into
them.
Rick Girard
On Thu, Jul 26, 2012 at 10:57 AM, Ellery Batchelder Jr
<elleryweld@aol.com>wrote:
> I have a 912 Rotax ULS 80 Hp on a Kolb MK3Classic and fuel is running out
> of the vent line on one carb what should I look for to stop this?
>
>
> *
>
> *
>
>
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
Message 4
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Subject: | Re: New Firestar II owner - question about elevator oscillations |
Thanks for your reply, Rick.
I don't have any trim controls on my Firestar, though I have considered installing
a "ground adjustable" trim tab on the elevator as I have for the rudder and
ailerons, or a simple bungie trim system. The elevator control cables have
no play in them and all bolts are tight on the tail feathers. One suggestion
was to tighten the elevator cable turnbuckle by 1/2 to 1 full turn. I have not
tried this yet.
There are 3 bolt holes to choose from at the front of the elevator to adjust the
angle of incidence and both sides are currently attached in the middle.
One of the lower elevator support cables (the cables that can be disconnected to
fold up the tail) on the left side was not as tight as the opposite side, so
I moved the connection to a different hole. They are now both nearly as tight
as a guitar string, but it made no difference.
The paint appears to be the original.
I will be happy to install counter balance rods on the elevator if necessary.
My thought was that maybe something simple in the set-up of my Firestar was off
since nobody else has had a problem with elevator flutter.
I will take a few pics of the tail when I go to the hangar this afternoon and maybe
someone with more Kolb experience will see something obvious that I'm missing.
Thanks,
Eric
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=379259#379259
Message 5
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Subject: | Re: New Firestar II owner - question about elevator oscillations |
Correction: I checked my notes and the suggestion to increase the elevator control
cable tension is only 1/4 to 1/2 turn of the turnbuckle.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=379271#379271
Message 6
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Subject: | Re: New Firestar II owner - question about elevator oscillations |
At 12:00 PM 7/25/12 -0700, you wrote:
>
>Hello fellow Kolbers,
>
...................>
>I dialed her in with rudder and aileron trim tabs and she'll fly straight
as an arrow, hands off, in calm conditions. But when she gets bounced
around in light turbulence, the elevator will occasionally begin to
oscillate if I don't keep a firm grip on the stick. It starts slowly and
will increase gradually, but I can easily stop it by changing airspeed or
pitch. I had a former Firestar pilot and multiple airplane builder fly with
me in his Rans to watch and he said the boom tube began flexing - that's not
good. The immediate solution has been to never let go of the stick.
>
Eric,
Pitch stability is much like a pendulum of a clock, in that the greater the
distance the vertical cg is below the wing and the larger the mass (weight
of the aircraft) the more stable the aircraft is in pitch. Each plane will
seek to oscillate in pitch at its own natural frequency. As the vertical cg
moves forward it puts more load on the nose and this causes the nose to
drop. As the speed builds and the cg moves toward the rear more lift is
generated and the nose will rise, etc.
If your boom tube to cage connection is flexing, I would check out cage and
boom tube integrity with in the cage.
Pitch stability can be aggravated and corrected by stick input.
Jack B. Hart FF004
Winchester, IN
Message 7
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Subject: | Re: New Firestar II owner - question about elevator oscillations |
Correction: I checked my notes and the suggestion to increase the elevator
control cable tension is only 1/4 to 1/2 turn of the turnbuckle.
Eric S/Kolbers:
You have a unique situation. First time I have heard of elevator flutter
with any Kolb aircraft, except a fatal accident many years ago that involved
a Twinstar with adjustable elevator trim tab that was a stock item on
Twinstars.
Why they all don't flutter, I do not know. They are all very much
unbalanced, hanging from the leading edge, as does the rudder and ailerons.
I like my tail brace wires tight, as in fiddle string tight, no slack.
Elevator cables I also like tight. When the elevators locked (have someone
hold them snug), there should be no play in the control stick, fore and aft.
We were just talking about rudder flutter. One way to eliminate rudder
flutter is to keep your feet firmly planted on the rudder pedals. Another
way is to double up on the rudder springs. Both ways keep the rudder cables
tight.
I'm guessing tight elevator cables would eliminate elevator flutter. If
not, tight elevator cables will certainly give the Kolb a much better
control feel in pitch.
john h
mkIII
Titus, Alabama
Message 8
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Subject: | Re: Carb Problem |
Thanks Guys yes it did sit for a while but the problem was some meat head u
sed silicone to hold the gasket up in side the carb base and he used it gen
erously and it squeezed out inside the carb and that was what I found in th
e seat so I checked other carb and found the same I cleaned both carbs an
d now there is no problem, now to have an annual done and get her in the wi
nd
Ellery Batchelder Jr.
-----Original Message-----
From: Richard Girard <aslsa.rng@gmail.com>
Sent: Thu, Jul 26, 2012 2:56 pm
Subject: Re: Kolb-List: Carb Problem
Ellery, In addition to checking the floats and needle valve, check to see t
hat all passages from the float chamber to the carb throat are clear. Did t
he engine sit for awhile? The crud in present day fuel makes a compound tha
t can seal those small, drilled passages like you'd poured epoxy into them.
Rick Girard
On Thu, Jul 26, 2012 at 10:57 AM, Ellery Batchelder Jr <elleryweld@aol.com>
wrote:
I have a 912 Rotax ULS 80 Hp on a Kolb MK3Classic and fuel is running out
of the vent line on one carb what should I look for to stop this?
get="_blank">http://www.matronics.com/Navigator?Kolb-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
Message 9
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Subject: | Re: New Firestar II owner - question about elevator oscillations |
This is a new one, and it sounds like you already have the bases covered. Something
that you might try is to put a trim tab on the elevator to get it out of
dead center, because that can get it hunting to try and find the place where it
wants to live. Use the trim tab to load it postitively in one direction, and
then - if necessary - put a spring loaded in flight adjustable trim to restrain
it in the opposite direction so that you can live with it. Then go test fly
very cautiously and see what happens.
You do know that any time flutter occurs, the quickest way to stop it is to kill
the airspeed by chopping the throttle and easing back on the stick?
Regardless, you need to fix it. Keep us posted.
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
richard (at) bcchapel(dot)org
Kingsport, TN 3TN0
Now faith is the substance of things hoped for, the evidence of things not seen.
Hebrews 11:1
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=379304#379304
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