CONTROL SURFACES

[Michael]

1. CA hinges should be OK. You can go to the pinned nylon hinges if you are
doubtful. Increasing control surface area with respect to the total area of
the surface it is part of increases the opportunity for flutter, so you need
to be very sure to seal hinge lines, use stronger control linkages, and with
"no" play in them. Counter-balancing obviously will help offset the larger
threat of flutter.
2. DO you use dual rates when you fly pattern? If so, you will want three
rates to fly both 3-D and pattern (Two for pattern, the outrageous throws
for 3-D). You will probably want more expo with increasing throws..
3. The only design question is whether you will need to move the c.g. aft
for 3-D. With a good pattern design, it seems that all you will need is to
increase the throws (and change the prop?). A good design is: (1) uncoupled,
and (2) stays uncoupled as yaw and pitch angles increase to their maxima
associated with your pattern sequence (3-D flying usually only goes beyond
the sequence limits after the 3-D model is below stall speed).

Hey, good luck!

Mike Nauman
NSRCA 1062
AMA 7044
N6QZ

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