This way to pilot model gliders is very common in the South-West of France. It allows
to extend drastically the range of the flight (if the wing section is compatible).
We use the throttle stick to move up&down the flap(s) and/or the elevons (ailerons used as flaps too).
HOW TO DO IT :
2 options :
A) The most used : disable the notches of the flap stick and mount the neutral return spring;
B) Make a big notch on the flap stick to mark out the neutral position.
Setting of the control :
- When you pull the stick, the flaps move down (more lift, less speed).
- When you push the stick, the flaps move up (less lift / more negative lift).
a) The main advantage is the possibility to make smooth real-time adjustements of the wing lift.
You move the flap down :
- to slow down in a thermal;
- to slow down during the landing;
- to jump over the the bushes when the lift is very light on the slope;
- to make radical turns without loosing any speed. A snap-flap mix is very usefull.
You move the flap up :
- to have an higher sink rate;
- to improve inverted flights.
b) It allows you to use flaps with a simple 4 channels radio.
If you have only a simple 4 channels radio, you can use the flap manual trim to have 2 flap positions.
It's very helpfull when you want to keep the best glide ratio during a long time.
Set up your controls in the way that :
- pushed trim => flap neutral (standard flight)
- pulled trim => flap a little down (best glide ratio)
- then the flap stick is used :
- to have the maximum lift (thermal, quick turns, jumps over bushes)
- to move the flaps up (diving, inverted flights).