My Sincere apologies Jim. I misread your post and thought you were putting on a smaller motor. Reading it again I see that you referred to another plane. I am Redfaced here.....
Ihave corrected my response.

Floats have more frontal area than wheels, but they are more streamlined, too. Drag is not increased as much as some think. Trainers with flat-bottom airfoils actually seem to be MORE aerobatic with floats.
Some seem to think that adding floats means you need to upsize your engine to a turbo-cosworth, but Ihave not found that true.



Tower says the Big Stik .60 "REQUIRES: .60-.91 2-stroke or .91-1.20 4-stroke Engine 4 Channel Radio minimum 5 Standard Servos Y-harness Building and field equipment</p>

COMMENTS: This kit has a fully symmetrical wing held on with the included nylon wing bolts. This plane can be built as a taildragger or with a tricycle landing gear."

An OS.61 will fly it. You might find that it climbs/accelerates/slows for spot landings better with a 14-4 than with a 12-6.

I'd probably grab a .90 4-stroke, and use an onboard glow lighter for a more reliable slow idle. That's what I used in my telemaster, and it's in a BTEFlyin'King now. </p>