I've used slotted flaps. Still do. And Miles' all-flying flaps, too.

They work great. The Miles' type are easy to retro-fit.

I've used them on models from 6ft span to around 8ft span, without problems.

Quite possibly the most fun you can have with your clothes on. They can lead to other "problems", though, such as a lack of control at the very low airspeeds which are sometimes possible; easy enough to just fly a little faster, of course.




I'll see whether I can find a photo.