Why change the original design? It would have probably flown very well on
Ailerons on a wing with significant dihedral and lots of drag will often cause
a lot of adverse yaw. Removing the dihedral will cure SOME of that. However,
barn door ailerons cause more adverse yaw than strip ailerons, so you're back
to square one there.
Less dihedral, differential throw and/or aileron/opposite rudder coupling may
My advice would be to build a new, stock wing, and fly it with three channels.
"There's a Hun in the sun!"
Got it backwards. You want your rudder to turn the same way as the
ailerons, because the problem is adverse yaw, causing the plane to turn
against the ailerons. Other than this detail, I wholeheartedly agree.
Differential throw is also a great idea.
Absolutely. When you add ailerons to a plane designed for three channel
flying you are opening a can of worms. You soon discover that you have
to change several things in order to make it fly right, and you end up
building a whole new set of wings. Just leave it like it is and have
By the way, when you think that you are finished with this plane because
it has nothing more to offer, try some new maneuvers. You will probably
discover that it has another entire performance envelope that you didn't
know about. I used to teach new RC fliers on a plane that I designed
for 049 and two channels. We would build the plane together (a 42" span
all sheet flat bottom trainer that looked a lot like a Goldberg Eaglet,
but smaller and a lot lighter), then fly it without a buddy cord. It
was a very stable, lightweight, durable and friendly airplane. One
friend of mine had such a successful time learning to fly it that within
a few lessons he was just buzzing it around at constant altitude and
looking great, and he proclaimed that he was ready for something new.
So I took the radio from him and did a split S, rolls, a snap roll, a
powered spin, an immelman, and a quick succession of tiny loops. He was
so impressed that he ended up flying this plane exclusively for the next
several months, and he didn't care about ailerons any more.
Differential will help. You could use two small servos in the wings, and a
computer radio to do the differential (good excuse if you don't have one),
or change out your 90 degree bellcranks for 60 degree (pre-computer
solution). If you have already installed 90 degree bellcranks, can't get
at them, and have a single rod to each aileron connected together at the
wing-center aileron servo, then you could still effect differential with a
funky linkage that connects each of the wing pushrods to the output wheel
of the servo at a different location (say 30 degrees apart from each
other) such that the "up" aileron movement is increased, and the "down"
reduced. The hard part about this would be if your horns are on the bottom
of the wing (as they probably are on a parasol), since the control rods
need to crossover; but it could be done.
If building a new wing, think about using a semi-symmetrical airfoil, and
reduce or eliminate the dihedral. Frise ailerons help with adverse yaw too
(where the leading edge of the "up" aileron hangs into the airflow below
the wing to increase it's drag).
The other posts about keeping it simple have a point. Maybe this isn't the
airplane for what you want to do. OTOH, it's a hobby -- knock yerself out.
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