Humans are getting close to being able to duplicate the aerodynamics of the bumblebee, but we are far from being able to provide the power and energy in such a small package. Our other planes would benefit very little from it, or in the end be hurt by the complexity and weight of sealing. Also, the gas tends to leak through the plastic rapidly, quickly eroding any possible benefit. Direction of motion in the fluid is say 30 out away from the boat heading, so the lift, being 90 from the paddle motion through the water, is 60 relative to the boats heading which means thrust. Bring the paddle toward you, and again get the forward thrust.
Propellers make flight for humans comfortable and efficient.
Birds, and all natural fliers, can't use rotary motion and so must get by on flapping. The AMA and NFFS have good connections to indoor models. An AMA membership gives you automatic liability insurance. AMA sells Detta Dart entry level kits, and videos, books and manuals. Lew Gitlow, Box 5311, Salem, OR 97304.