I am scratch building a 60 size (YS91) plane that will see some occasional 3-D flying with a lot of hot dog sport flying. I have some questions on the control surfaces (aileron, elevator and rudder). The plane will be 60” wing span and firewall to rudder tip is 48-3/8”

How thick should the control surfaces be 1/4” or 3/8”?
How wide would you make them? (I was thinking 2-1/2” tapering to 1-3/4” wide for the ailerons and 4-3/8” tapering to 3-1/2” on the elevator)
Should they be built-up or solid?
Should the chord be straight or tapered?

Thanks very much for your opinions.

just build em built up and big- thats all i can say from experience.
Luke

I would recommend that your control surface on elevator and rudder be 60% of total area with 60 degrees of throw each way. The Aileron should be 20% of total area with 45 degree throws.

What about thickness then? Make them a constant thickness?

On a 60 size, I would make them flat.

Get ready for some flutter in the tail planes. A YS91 is powerful and will vibrate loose 1/4 thick built up elevators. I would suggest adding flying wires that connect the fin, stab and bottom of fuselage. You should not have CG issues with that engine.