3D ONdaEDGE wrote:
Dude you might better check your calculations again. You are crazy if you think a standard servo is gonna stand a 60 mph Wall. No way. Not on a 90 size plane and probably not on a 60- size.
You are misinterpreting the results.
First of all, I have never stated that a standard size servo should be enough for this kind of aircraft!
Second, the calculated values are the torque needed to deflect the surfaces to the given angle at the given speed. Nobody does 3D at 60 mph. but I had to choose some airspeed for my calculation and I know for sure that this aircraft will now and again be flying at that speed.
Third, servo torque figures are often given for a stalled servo. This means that if the servo is expected to operate at loads close to its maximum torque it will move VERY slowly. Also the gear train in the servo is not designed to operate at maximum torque, but for very brief periods of time.
From my experience if I choose servos that has a torque rating that is double that of the calculated values, the servos will be O.K. and perform with adequate speed. For pattern planes were I want a really quick and exact response I use servos that have torque values trice the calculated torque.
Now on some planes both elevators halves put together may be larger than the rudder so then they would need more power than the rudder.
Sure, but in my example the elevator torque is for the left and right elevators together.
/Red B.