Originally Posted by goneflyin
Dave, good points for sure.
You would definitely want to build in the best compensation using engine thrust and wing incidence. The mixes would be minimal then. But at least you can adjust the mixes to suit pretty much any airframe that you might encounter.
Even the best built aircraft will benefit from a throttle to elevator mix. You would probably see a 1-3% down elevator mix on low throttle to get the straightest downlines. There comes a point where you've made the best cg choices, the straightest airframe, etc, and still there will be 'patches' necessary to bring it all in line.
Some guys like to turn off that mix in landing mode but i don't bother. I'm hanging on to the elevator on approach anyway and don't feel a 1% down mix there.
I actually don't turn any of my mixes off. There's the down line throttle to elevator mix, and a rudder to elevator mix (2-3% up elevator both ways).
They run all the time. Seems like it's not been a problem.
I agree that if you have some large numbers in those mixes that it might cause a problem, but i think it's a rarity.
Good discussion, thx,
I agree Don. I have 3% down mixed in my SBach at off throttle - it used to gradually climb out of the downline after stall turns and such..now it drops straight. Since i usually have to have some throttle when landing this mix doesn't come into play. Also, the rudder/elevator mix (about 4% down on either knife edge) isn't apparent when landing. Like you I'm hanging onto the elevator anyway....