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Hi Tom
I haven't used a slider for camber control in over 10 years (since the
Airtronics Vision). For a given angle of attack there is only one flap setting
that will result in minimum drag, be it positive camber for high AOA or negative
camber (reflex) for lower AOA's.
Airfoils obviously are designed to need no camber changing devices when
near their "normal" AOA (for soaring, this would be near Best or
Max L/D AOA). Deviations from Max L/D AOA may benefit from small changes in
camber to reduce drag.
Some airfoils respond well to camber changing. Some thin, low cambered
airfoils, don't like high AOA's and respond well to a little camber at high AOA
(the Nyx comes to mind here). Higher cambered airfoils like the 7037 do fine
without camber. Although they may benefit with a little camber near the stalling
AOA, the benefit won't be as noticeable as with the low cambered airfoil. You
really need to deviate quite a bit from Max L/D AOA to need positive or negative
camber, i.e. flying very slow in a thermal or pushing hard and fast. If you're
using more than a few degrees either way, you're probably using too much. Play
with 1/16 to 3/16 inch of positive and negative camber on a toggle switch and
save yourself the hassle of messing with the slider. I'll agree with George
Voss--The odds of you selecting the correct camber setting with the slider while
thermalling is slim to none.
Try putting Launch/Cruise on a 2 position switch and Thermal/ Speed on a 3
position switch (all as presets) and do away with the slider.
Sorry, I know I haven't answered your original question (my 9303 is too new
for me to have figured out the answer to that. If you figure it out, let me know
just for my general knowledge). Try Tom Copp at www.F3X.com. He might be able to give you an
answer since he's proficient with the radio. He also has a couple JR manuals on
his website that have instructions for setting up a sailplane.
Ben Clerx
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