RE: Sig senior ready to soar
It'll be fun, I hope. Still, even with the seniorita, the 81's are really best for foamies and light electrics. Darn good servos, but not really best suited for this application.
Just my opinion, of course. But then, I like fast high-torque servos and LOTS of throw. I'm sure the 81's will 'work', but I don't think they will be as durable as a quality standard servo would be. It might be best to save a bit of weight somewhere else if you have an option.
Good Luck and Have Fun!!