On or off floats, I assume the rule's the same. Is there a formula as to percentage of wing surface vs flap area? I have a couple of planes with strip ailerons that I want to split and have a designated flap, but not sure how much of the aileron I should give up. One of them is the VMAR 60 ARF Beaver

Usually you don't really need them for landing. The extra drag of the floats mean that most planes land with a bit of power anyways (throttle = rate of descent). They do look cool though...I would start by looking at the wing of a full size beaver and do the math from there.

On takeoff, some planes with semi- or full symetrical wings can make use of flaps for additional lift..

I always wanted to put flaps on my Senior Telemaster because the glide is so flat. Flaps would steepen that up so I wouldn't have to be so close to the bushes on the opposite shore when I'm coming in. Real flaps, though....not flaperons.

I have not been happy when I tried flaperons. Flaperons always seem to cause my plane to have tipstalling problems and adverse yaw. Adverse yaw and tip stalling are not the kinds of things that add enjoyment to my flying experience. I DO use the elevator/flaperon mixer on my "Jerry's Little Boy". When I put a Hanger9 superstik on floats rigged with zero incidence I found it necessary to use the flap mixing to get it off the water.

My beaver (8 ft. wing span) has 18" ailerons and 22" flaps. Hope this helps..........Seaplane

This is on a VMAR DeHaviland Beaver with a 71" wing, fully-symmetrical. You should see the kit (ARF) very well done and would impress most builders. The hardware is so so. Maybe I'm too easy to please. But, I have read nothing but bad reports on flight characteristics. All seem to indicate a tip stall and then a non retrievable snap roll as the plane banks on a turn. I even contacted a dealer in S. Africa who states the opposite, that it is a popular plane and flies well. Thats three bad reports from costumers and one from a dealer. You figure.

I will attempt to put about a 3 degree wash out and hope it helps. The plane will weigh around 8-9# with floats and hope the flaps help on take off and landings, preventing the infamous snap roll.

Have a brand new saito 72 that will power it.

What kit you have and any pictures?

A bit of trivia, did you guys know that full size Beavers use flaperons along with flaps? And yes, just like the models, aileron control is diminished and there is a lot more adverse yaw when the flaperons are down.

A little more trivia, and just like the Real Beaver, when using too much Flaperons, and cutting a turn to tight, it may have a tendency to snap into a quick spin... makes for an unhappy camper!
Doc

JIM :: ever try having your flaperons go UP ( spoilers ) instead of down on the telemaster. Just like the glider boys!!
ENJOY !!! RED