Today's Message Index:
----------------------
1. 02:50 AM - Re: Re: Aileron trim (Patrick Ladd)
2. 02:40 PM - Horizontal stabilizer seals (Richard Girard)
3. 07:59 PM - Re: Horizontal stabilizer seals (Richard Pike)
Message 1
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Subject: | Re: Aileron trim |
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Message 2
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Subject: | Horizontal stabilizer seals |
It's miserably cold outside, the dogs are walked and snoozing and my chores
are done so I thought I'd put up something for Kolbers.
A few years ago I wrote a lot about my adventures trying to get a poorly
built Mk III C/X to fly like a Kolb ought to. The airplane had started life
as a "C" but after a crash the cage was replaced with one for an "X" and
with only 25 hours on it, it had been through 4 owners by the time it came
to me. I called it the "Plane from Hell".
One of the things I did when I was trying to get the elevator to trim out
was make seals for the horizontal stabilizer. The seals did nothing for the
pitch trim problem but it gave an impressive improvement to rudder
effectiveness. Originallly, the testing was done with seals made with duct
tape. When I found the improvement to the rudder I decided to make more
permanent seals from fiberglass.
The rudder improvement I found was that the seals made it possible to pick
up a dropping wing during stall with rudder alone, just like I was taught
in the C172. Without the seals, neither my IIIC nor the IIIC/X would do
that. I should add that by the time I reached this point I had reset the
wing angle of incidence to the current recommendations so the airplane was
a full "X" by that time. Anyway, with the seals in place I could hold the
stick back against frame tube and pick up a wing with the rudder. In my "C"
I tested it at up to 1100 lb. gross weight. With the "X" I held it at stall
at a weight of 1280 lb. In both airplanes I held it for at least 1000 feet
of altitude loss and it was no problem at all to keep the wings level.
I didn't make any photos of the duct tape seals but I did of the seals made
from fiberglass. I made them right on the aircraft using duct tape as a
release agent, a standard Burt Rutan method. On the "X", since the
horizontal stabilizer is straight down the boom tube, I made two seals for
each side then bonded them together. If I had it to do again, I'd tape off
the underside, too, shoot some house sealing foam into the gap then sand
the top to shape so I could get a better form around the forward stab
mounting hinge. Another thought I've had is that I could probably have made
good seals that would have allowed easy folding with foam tape like that
used for sealing a camper shell to a pick up bed.
So, it's winter and a good time to do projects and making horizontal
stabilizer seals is a good one to make your Mk III a better, safer aircraft
.
Rick Girard
--
=9CBlessed are the cracked, for they shall let in the light.=9D
Groucho Marx
<http://www.goodreads.com/author/show/43244.Groucho_Marx>
Message 3
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Subject: | Re: Horizontal stabilizer seals |
Good topic. I noticed a substantial difference in elevator effectiveness when I
gap sealed the elevator on my MKIIIC to the horizontal stab (Not likely that
I could gap seal it to the vertical stab...) and also added vortex generators
to the underside of the horizontal stab at the 10% cord line of the stab and elevator
combined cord line.
Please post pictures of your results, and be sure to not resize them; we got to
keep Herb happy and lazy!
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Would you consider yourself to be a good person?
https://www.youtube.com/watch?v=VWcDXT6pH7A
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=451794#451794
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