There are so many unknowns in this that it would be very difficult to judge.
The loading on a rudder depends on so many things such as; Displacement, Speed, Rudder Size, Rudder angle etc that I can only suggest you try it out.
You can buy quite a wide range of servo's now in all sizes and with many differrent torque outputs so I am sure that you will find one that will do the job.
My only experience with mini servo's so far is one to steer my Revell 1/72nd scale U-Boat, which hasn't been used in anger yet and one to control the gas valve in my steam boat.
I don't feel I'm being a lot of help but I would suggest that you don't jump into the first Ebay item you see but talk to some people in the know and have a good search on the Internet in the big manufacturers sites such as Hitec.
I would have a chat with the guys at Scoonies Models. They are very helpfull and very accomodating and were a great help when I was looking for a mini receiver for my Sub.
I actually think the one on Ebay would do the job and if it stays cheap you have nothing to loose by giving it a go.
I'm surprised you haven't got much room in a 32 inch boat, just what is a Blue Flue? |