Today's Message Index:
----------------------
1. 12:11 AM - Re: : Stabilizer Angle (JC Gilpin)
2. 05:20 AM - Re: Stabilizer Angle (Richard Pike)
3. 09:42 AM - Re: Stabilizer Angle (Rex Rodebush)
4. 10:01 AM - Re: Stabilizer Angle (Frankd)
5. 12:43 PM - Re: Stabilizer Angle (John Hauck)
6. 01:14 PM - Re: Stabilizer Angle (Richard Pike)
7. 02:30 PM - Re: Stabilizer Angle (John Hauck)
8. 05:23 PM - Re: Stabilizer Angle (Bill)
Message 1
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| Subject: | Re: : : Kolb-List:Stabilizer Angle |
It's gonna be real interesting to find out what the real reason is for all
this....
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Message 2
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| Subject: | Re: : Kolb-List:Stabilizer Angle |
victorbravo(at)sbcglobal. wrote:
> To answer the recent questions...
>
> I do have 3/4 of a gap seal between the wings. What I mean by that is that I
have an aluminum "airfoil" shaped leading edgee piece that slides on from the
front,a nd extends back to just behind the thickest part of the wing. This aluminum
piece ends right at where the main spar pins are installed. THEN I have
a fabric cover that Velcro's btween the wings from there to the rear carry-through
where the wing fold U-joints are. The front of this fabric cover overlaps
and Velcro's to the back of the aluminum piece. So there is not a huge hole where
the air can flow upward between the wings. But there is nothing on the TOP
of the wing behind the aluminum leading edge fairing and in front of the engine.
Maybe 18 inches of wing chord with no cover on the TOP. All of the gap on
the bottom is covered back to the wing fold U-joints.
>
>
> Bill Berle
I think we may have found the problem: you have replaced the normal gap seal -
a KFM-1 airfoil - with what is in effect a modified KFM-2 airfoil. Kline-Fogelman
airfoils are know to have high drag. This would explain your inability to
go very fast. Since the normal Kolb center section underside is full of tubes
and stuff, turbulence associatd with the windshield, pilot's head, etc the normal
high drag associated with the KFM-1 airfoil is not so evident, but with yours
being a modified KFM-2 center section, and the upperside being comparitively
less cluttered, the drag is more pronounced.
Picture the fabric billowing up in flight under load: your modified KFM2 airfoil
is doing something that the normal Kolb center section does not do. With the
normal Kolb KFM-1 airfoil, the fabric bulges up in flight on the top, but you
have a KFM-2 airfoil on your center section and now when the fabric is bulging
up in flight it bulges from the bottom - who knows what that does?
I suggest going to a normal type of center section. There is a typical one on pages 30-34 of "The Yellow Book"; here: http://oh2fly.net/oldpoops/Lexan%20rear%20enclosure.html
For more information on the Kline-Fogelman airfoil; here: https://en.wikipedia.org/wiki/Kline%E2%80%93Fogleman_airfoil
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=482482#482482
Message 3
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| Subject: | Re: : Kolb-List:Stabilizer Angle |
Don't worry about anyone giving you s_ _ t when you find your problem. It could
be caused by a half dozen things or a combination of them. You are logically
working through the possible causes and that's all anyone can ask. No one has
a crystal ball, only ideas and suggestions.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=482490#482490
Message 4
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| Subject: | Re: : Kolb-List:Stabilizer Angle |
Hi Bill/Kolbers,
I am happy you have had more successful flights, even tho everyone thinks something
is still wrong with your stab angle.
IF the CG is OK, the wing incidence is good to the motor mount, your tube is
the correct length and the stabilizer angle is correct to the wing, then the only
thing I can think of is that the angle of your tail tube could be off.
If you lower that angle towards the rear, you will have to reset your stabilizer
angle back to where everyone thinks it should be. Worth checking it out?
I try to fly my MkIII Xtra at 60MPH and above. gap seals and a windshield will
help but if your tube is set wrong that would certainly slow you down as well.
I would be very nervous if I could only get 55MPH.
Keep that airspeed up lest the ground rise up and smith ye..
We all want you to have a safe plane and fly for a long time.
(Thanks Richard for the resize app. )
My 2 cents
FrankD
1014S.
Do not archive
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=482492#482492
Message 5
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| Subject: | : Kolb-List:Stabilizer Angle |
Is the tail boom adjustable?
john h
mkIII
Titus, Alabama
-----Original Message-----
From: owner-kolb-list-server@matronics.com
[mailto:owner-kolb-list-server@matronics.com] On Behalf Of Frankd
Sent: Friday, August 17, 2018 12:01 PM
Subject: Re: Kolb-List:Stabilizer Angle
Hi Bill/Kolbers,
I am happy you have had more successful flights, even tho everyone thinks
something is still wrong with your stab angle.
IF the CG is OK, the wing incidence is good to the motor mount, your tube
is the correct length and the stabilizer angle is correct to the wing, then
the only thing I can think of is that the angle of your tail tube could be
off.
FrankD
1014S.
Message 6
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| Subject: | Re: : Kolb-List:Stabilizer Angle |
John Hauck wrote:
> Is the tail boom adjustable?
>
> john h
> mkIII
> Titus, Alabama
>
> --
Well, it sorta is - but then the airplane gets even more difficult to trim...
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=482500#482500
Attachments:
http://forums.matronics.com//files/outoftrim_133.jpeg
Message 7
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| Subject: | : Kolb-List:Stabilizer Angle |
Richard P had me scratching my head until I saw the attachment. I hadn't
thought about that particular adjuster. ;-) Good comment. Goes well with
the photo.
john h
mkIII
Titus, Alabama
Message 8
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| Subject: | Re: : Kolb-List:Stabilizer Angle |
We are trying to arrange a second weight and balance to be done Monday. All evidence
points to the airplane being tail heavy, as so many Kolbers have mentioned
since the beginning.
John H thank you for taking time to talk to me yesterday. I will be incorporating
some or all of your ideas, but I do need to make sure I am not flying a dangerously
tail heavy airplane regardless of the aileron adjustment. But after speaking
with you I am confident I can slightly lower the ailerons without a safety
risk.
Sent from my Samsung Captivate(tm) on AT&T
Richard Pike <thegreybaron@charter.net> wrote:
>
>
>John Hauck wrote:
>> Is the tail boom adjustable?
>>
>> john h
>> mkIII
>> Titus, Alabama
>>
>> --
>
>
>Well, it sorta is - but then the airplane gets even more difficult to trim...
>
>--------
>Richard Pike
>Kolb MKIII N420P (420ldPoops)
>Kingsport, TN 3TN0
>
>Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=482500#482500
>
>
>Attachments:
>
>http://forums.matronics.com//files/outoftrim_133.jpeg
>
>
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