Konrad
Very Strong User
I'm seeing that a lot of higher end glider radio programing templets have a feature to tune the exponential response of the snap flaps.
I'd like to learn is why have this feature and how to use it?
In the old days we normally set up the servo for servo arm rotation to be 45° ether side of neutral measured at the airfoil chord line. Today most flap servos are set up the to be 90° and Zero degrees. Zero degrees being the locked* position for the down flap. Now most DSing ships have the flaps set up for zero degrees and 90° with the zero degree locked position being the up flap position (in profile). As the servo rotates away from the zero position the first few degrees (30°) of rotation results in very little linear response in the push rod.
I'm assuming that the radio templets that offer a way to adjust the exponential response of the snap flaps are doing this to balance the mechanical response from flap linkages that use this mechanical lock set ups.
So what I'd like to learn is what are you looking for in how the snap flaps respond in flight? I'm assuming that one wants the flaps to be dampened during the early (around center) elevator movement. And that as we pull more and more up elevator the flaps become more aggressive. I suspect this is done to keep the ship from having a jumpy feel as we make small elevator corrections.
*Locked servo linkage pertains to the condition where the servo output axis, the servo arm to push rod pin, and push rod pin the control horn are all in a straight line. This removes most if not all the rotational load on the servo gear train.
All the best,
Konrad
I'd like to learn is why have this feature and how to use it?
In the old days we normally set up the servo for servo arm rotation to be 45° ether side of neutral measured at the airfoil chord line. Today most flap servos are set up the to be 90° and Zero degrees. Zero degrees being the locked* position for the down flap. Now most DSing ships have the flaps set up for zero degrees and 90° with the zero degree locked position being the up flap position (in profile). As the servo rotates away from the zero position the first few degrees (30°) of rotation results in very little linear response in the push rod.
I'm assuming that the radio templets that offer a way to adjust the exponential response of the snap flaps are doing this to balance the mechanical response from flap linkages that use this mechanical lock set ups.
So what I'd like to learn is what are you looking for in how the snap flaps respond in flight? I'm assuming that one wants the flaps to be dampened during the early (around center) elevator movement. And that as we pull more and more up elevator the flaps become more aggressive. I suspect this is done to keep the ship from having a jumpy feel as we make small elevator corrections.
*Locked servo linkage pertains to the condition where the servo output axis, the servo arm to push rod pin, and push rod pin the control horn are all in a straight line. This removes most if not all the rotational load on the servo gear train.
All the best,
Konrad
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