I’m glad you mentioned that. The pogo would be as the result of carrying too much speed on touchdown. Additionally, if you got this on tarmac you might well have had to refurbish the tips of the elevators, and maybe even the wingtips, nose and underside beneath the tailpipe if the pogo was bad enough. I have that tee shirt.

I’ve mentioned in other threads that a few mm of aileron droop will lower the landing speed, increase drag (induced drag from the increased lift) and allow a steeper approach with some engine on. But I generally get shouted down and no-one ever wants to try it. So here goes again

I had a Bandito 90mm EDF jet (4ft span fast 8lb weight Bandit lookalike) that would pogo at the drop of a hat on tarmac and slowing it down for a smooth landing was always a struggle and all too frequently not achieved. Happily I worked out a cure and suffered no more landings like that. I still have a Fox Composites Hawk (about 50oz/sq ft loading) that would do the same thing until I applied my cure. The cure in both cases was not to use crow, which made no difference to that characteristic, but to droop the ailerons.

The nose-up effect of crow ailerons needs counteracting with extra down elevator trim. On a low wing low-tail Bandit/Bandito-style model with anhedral tailplane, the down-trim coupled with the nose-up attitude needed to slow the model can put the elevator tips in contact with the tarmac with regular gravel rash resulting.

Using drooped ailerons causes a nose-down pitching moment which reduces the amount of down-elevator trim required, and also lets the model land in a more level attitude, the reduced nose-up requirement being due to the extra lift from the drooped ailerons.

The two main reasons guys come up with for not drooping ailerons are increased risk of tip stall, and risk of more adverse yaw.

The first is a minimal risk as the flaps already induce massive washout. The second is easy to counteract by coupling some rudder throw with aileron when the flaps/drooped ailerons are selected.

FWIW I’ve been using drooped ailerons as flaperons for landing strip-aileron-equipped aerobats continuously for 30+ years, with coupled rudder for steering during the landing phase. This began from experiments with control-line-style coupled flaperon/elevator for aerobatics and ended up as a standard feature for taking off and landing this type of model on short bumpy grass strips. The only time you might find significant adverse yaw is if there’s enough down-flaperon to prevent the up-going aileron from actually going up at full travel, and my long experience is that at this point the main effect is that at landing speed the ailerons produce very little rolling effect and only a little adverse yaw which is readily counteracted by the use of coupled rudder (but see the caveat below). I have tried setting the flaperons as spoilerons from time to time, but never liked the effect as much as with drooped flaperons.

There is one caveat. If your model rolls adversely with rudder (as does my Boomerang Nano but I don’t know if the other Boomers do the same), then clearly you won’t have the option of coupling rudder to the aileron channel to counteract adverse yaw in the circumstance described above at the point when all aileron effect has disappeared due to aileron droop.

Just my experience. Make of it whatever you will, or maybe even try it out on a spare model.

Gordon