I've used flaperons on conventional planes, but a tailless plane like a delta only has elevons, a combo of elevator and aileron. There is no other control to drop down.

The same photographer with his long lens Nikon also caught me on takeoff. I was dragging the rear of the floats. I finally went to full up elevator and let the power yank it off. I have since added a 3/16 ply shim to the front struts. Hopefully, this will give me a little better takeoff.

I have used tail dragger, old timer floats and love them. I may need to figure a way to mount them on the delta. I had them on a Stinger 40 and it made the best takeoffs and landings.