Spoilerons

[A6INTRUDER]

I would like to see if anyone has ideas why spoilerons seem to work well on some planes and not other.
I fly mostly slope planes and I have some that seem to take well to spoilerons and some that just dont.
I have had sevral Art Hobby Colibris, I always build them with full span ailerons, and they work so well when using spoilerons. I use the throttle stick and just feed them in as needed to slow down and land. The Colibri will just hover with them fully up, and it can be moved ahead and back using elevator, and it retains pretty good roll control too.
One of the worst planes I had was a NSP Sparrow composite. Even just a little spoilers and it would get very squirley, to the point of out of control. I tried adding down elev too, but it just didnt help.
I understand that different airfoils probably respond differently but does anyone have any other ideas on this subject.

thanks

TIM

[Sparky Paul]

Spoilers, the usual kind, at the airfoil peak, and short spanned, and directly in front of the elevators are different animals than full-span spoilerons due to where they're located and the effect on the downstream components.
Mark Drela has a 36" or so span spoiler on his Allegro, a 2M plane.. it must come down like an anvil.
Spoilerons in essence are camber changers, adding reflex instead of airflow disturbance. And the reflex lowers the pitching moment which helps the longitudinal response, as you've seen.

[A6INTRUDER]

Thanks Sparky Paul,
What you say makes sense to me.
I am trying to figure out what makes each plane respond so much differently to them.
I understand that airfoil, length of spoilerons, tail moment are different on each plane, but I guess I am trying to figure out why it affects them in such different ways, and which types of airfoils, tail moments, etc work the best.
I like to build my own planes and I would like to figure out how to make ones that
respond well to spoilerons. They place I fly(slope) most has a very nasty LZ so getting the plane down in a good spot is very important.

thanks again

TIM