When using our Elastino, it is important to note that the profile curvature changes automatically depending on the speed of the air flow.
This means that with increasing airspeed (but also the headwind speed), the profile curvature prautomatically decreases and thus the lift, drag and pitching moment decreases.
For flight practice, this means that the speed of the model increases with down elevators as usual.
However, when the down elevator is neutralized, the model does not tend to flare, but continues to increase speed and push the nose down, since the lift and pitching moment have different basic values due to the profile change!!!
For this reason, for flight tasks such as distance and speed flight, after accelerating with the elevator, the elevator must be pulled slightly again to increase the speed and thus to keep the angle of inclination of the model.
Conversely, as the airflow velocity around the airfoil is reduced, the camber increases, so automatically increasing lift and angle of attack in slow flight.
Thus, in this flight condition, after reducing the airspeed, you can slightly apply down elevator to thermal circles.
For a familiar roll function (aileron) response, we use a progressive expo function of 55%, resulting in larger deflections around the stick’s neutral position.
A “normal” EXPO function of about 30% is sufficient for the elevator. Otherwise, the control of the model is very sensitive.