Mark
Thanks for the advice. I have studied your webpages for some time now
and it is clear you have good experience!
Regards
Deon
On 13/01/2017 02:18, Mark Langford via KRnet wrote:
Virg wrote:
> Pitch sensitivity is an overblown item, Virg
Now that I have put over 1100 hours on a KR2S, and almost 300 on a
KR2, I feel qualified to say that there is a pretty large difference
in pitch stability between the two. Yes, the KR2 is entirely
controllable, but then mine is flown at the very forward end of the CG
envelope. Having said that, I did PIOs (pitch induced oscillations)
for many of my first KR2 flights.
Jim Hill, who put several hundred hours on his KR2 before he broke it
in half and extended it to become a KR2S, once said "let go of the
stick?...You can't let go of the stick...YOU'LL DIE if you let go of
the stick!
By contrast, my KR2S is simply not an issue to fly. Keeping the CG
forward cannot be overstressed, either way. From my experience, any
speed penalty is practically impossible to quantify.
To answer the question of how to lengthen the horizontal stabilizer,
Troy Petteway did it (and reported a big improvement in stability) by
adding 6" onto the tips of the stab by simply adding foam, sanding to
shape, and wrapping with two or three layers of carbon fiber. That
plane is still flying, last I heard. He also decreased the size of
the elevator to lessen the over-control tendency. See
http://www.n56ml.com/troy/ for photos, both near the top and near the
bottom (actual construction of both horizontal stab mods and "new
airfoil" wings.
One thought on rebuilding the elevator is to simply cut it in half and
remove it, and built another one from the template set at the bottom
of http://www.krnet.org/as504x/ . Build the new h/s spar with a
"ship lapped" joint in the middle, with a widened bellcrank plate as a
metal splice joint. The aft deck is non-structural, so turning some
of that into a removable fairing will provide access to the bellcrank
for dealing with the hardware.
There are other ways to deal with it, but this is one way I'd consider...
Mark Langford
m...@n56ml.com
http://www.n56ml.com
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