Originally Posted by romanov
Yeah, I do understand that, but yet the elevators angle
difference is not very big, is it cause eventually it is
achieved by very small angle of elevator?
There is no direct connection between how many degrees of travel the elev. the elevators have up and down from neutral, and how much travel the trim tabs have up and down from neutral.
The elevators travel range is based on how much travel the pilot needs for all flight conditions, to control the aircraft.
Example - enough nose down elevator for stall recovery, etc.
The trim tab travel is based on how much travel is required to attain hands off trim in any normal flight condition.
Example - pitch trim will never be used to recover from a stall so the trim tab doesn't need to have enough trimming authority to induce full down elevator.
A general rough guide line on all of the RV's (except the 10 and the 12), the trim system should be adjusted so that the trim tab will proved about twice as much nose up trim (tab travel down) as it does nose down trim.
If the parts supplied with the RV-14 kit are installed per the plans, this is approx what the travel ratio will be, and in flight the pitch trim will provide sufficient trim authority for all modes of flight.