Hey Mike,

How come some planes seem to span better one direction or the other? What is the fix when you encounter this? Are there any tests to see what the probable is caused by if there are multiple possibilities?

Thanks

Rob

There are various reasons for that to happen. First be sure its not a mechanical issue where there is a pushrod flexing when its pushing. Take a look and see if the model is weak in the direction that the rudder is pushing as opposed to pulling.
If thats not an issue, be sure you have equal rudder and aileron throw left and right.
If thats not the case, start to look for servo blowback as a culprit. See if the model snaps more similar left and right if its at low speeds. Check that by snapping power off on vertical down lines.

If all of that proves to be ok, compensate by changing the rudder and/or aileron throw in the weak direction to make the snaps look the same.

Thanks for the info Mike.

Mike I just learned to do a negative snap while inverted. I have always used same side stick movements for upright positive snaps. INverted negative used opposite stick movements. What are the things I should do to not get burried into the snap so that I don't bleed off as much airspeed as I do. I know a reduction in rudder is in order, but when I do that, I don't get good stall turns!

Forst, unload the snaps. That is initialt the snap w/ sticks in corners (opposite corners for negative snaps) but immediately pull the elevator out as the model starts to rotate. Secondly, you do need to reduce rudder. I flip to high rate rudder for stall turns.


On the subject of unloading snaps, that technique works extremely well on SA models. It doesnt typically work on pattern models. Because the wing loading is so low on a pattern model, it becomes unstalled if you unload the elevtaor and stopps snapping. Just wanted to add that.