Barry,
I believe that it would sure be easier to try the trim tabs first
before going to all the work of changing the engine location. The trim
tab on my aileron is still just taped on and has been for 125 hours. Just
a quick word on the C/G which I know is not your concern but my 2S was
set up that the most forward condition was 1/4 inch in front of the
limits. At full gross flying I still felt it was moved to far back and
felt just a little funny. I added a larger oil pan recently and the 2
extra quarts of oil has made the plane feel more solid. I will recheck
the weight and balance soon to see exactly where it falls. I flew off 2
tanks of fuel over a 6 hour period the other day and only touched the
trim 2 times. That is with burning off over half the header tank and
transferring from the wing tanks once per hour. I know there are a lot
more things involved like the airfoil, tail incidence, total weight and
so on. The point is anyone C/G range may not be correct for every KR out
there. I believe mine is more like 1" in front of the forward limit and
close to 3" in front of the rear limits.
If you are really worried about the drag from the trim tabs try
them as a temporary and keep reducing them in size until they are optimum
in size and effect. They really don't produce much in the scheme of
things and there are plenty of other places to reduce drag on a plane.
Good Luck,
Joe Horton, Coopersburg, Pa.
[email protected]
On Wed, 29 Nov 2006 09:01:45 +1000 "Barry Kruyssen" <[email protected]>
writes:
> Thanks for all the comments.
>
> A few people mentioned my C of G, it is at the forward limit with me
> and a
> full load of fuel in the header tank. At MTOW less fuel, it only
> move back
> 5.46 inches (138.65mm). This has been weighed on certified scales
> by a
> LAME. When fitting up my 132.28lbs (60kg) Jabiru motor I had to
> move the
> engine a long way forward to get the C of G right, the engine mount
> is 17.32
> inches (440mm) long.
>
> While fitting a trim tab is an option, I want to try to correct it a
> bit
> first by moving the engine as trim tabs produce drag.
>
> Thanks and Regards
> Barry Kruyssen
> Cairns, Australia
> [email protected]
> http://www.users.bigpond.com/kr2/kr2.htm
>
>
>
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Joe Horton, Coopersburg, Pa.
[email protected]
