ORIGINAL: Balsacutter
I've never heard of anyone trusting S3101/Hitec HS-81 mini/micro type servos in gas-powered aileron service, even on a sedate model like a .60-size Cub.
I used dual HS81MG as aileron servos on my 60 size top flight mustang.... =) Worked fine. But perhaps the were a bit weak. But On a cub they would work fine i think.