I have a H-9 1/4 scale cub on floats with a G 26, which comes off the water pretty good, Im wondering if adding flapperons will help

Will help with what? You say it comes off the water "pretty good", do you want it to come off the water better?

If so, try this:

First, put a level on top of the floats and block them up so they are level (Or use an incidence meter to check this)

Once they are level, put an incidence meter on the wing. You should show 1.5 - 2 degrees positive incidence (that is, the leading edge should be higher than the trailing edge)

If you have less than that, shim the float mounts to get the proper incidence.

If the incidence is good, shorten the aileron pushrods by about 2 full turns each. This will drop both ailerons just a little which will provide extra lift.

Adding flaperon function to a cub style wing effectively adds wash-in to the wing since the ailerons are being lowered at the outer extreme of the wing panels only. This will cause the tip to stall first rather than the root, which makes for a very uncomfortable flying plane.

I've put flaperon function on a goldberg cub which uses full span strip ailerons. Lowering these ailerons does create a flap effect that is most useful on landing. I am careful to avoid letting it get slow, because I don't want to get near the point of tip stall. Other cubs have a more correct (for a cub) arrangement of the aileron- a barn door style that does not extend all the way along the trailing edge to the wing root. Those types I would definitely not bother with flaperons. They will only cause problems.

Jeff

Not a good idea...unless you are really agile with your rudder thumb, there is a really good chance of an unplanned tip stall. The risk outweighs any possible benefit.

If you have the barn door set up you could cut out a set of flaps from the wing, a la super cub. I have thought of doing this to my great planes 40 size cub I have had for a few years. If nothing else it would be fun to try to do.

I had a cub that had the inner panel (between the aileron and fuse) as a flap (my dad built it this way, kind of Super Cubbish).. It did make a "BIG" difference for takeoff and slow flight. This was a 60" WS cub with a .19 Enya on it.. If you want to do surgery on your wing, you can add them in.. But I wouldn't go with flaperons, because of what has been said already...