Would do a Sig Kadet Sr. in a heartbeat for the Saito .56. It is an incredible plane to fly and do touch and go's with as well as about the perfect plane for float flying. No, you don't have to add more power for the floats. I have one with that engine. Great plane to teach you cross wind take offs and landings as well. Have all kinds of other planes to fly but always enjoy the Kadet and fly it every chance I get.