Supposedly the SM F-18c does not allow for a standard sized servo on ailerons.
I have read that some have used the JR DS3421 mini.
Specs are:
* Size Category:Minis and Micros
* Type

igital
* Torque:65 oz/in @ 4.8V , 75 oz/in @ 6V
* Speed:.18 sec/60° @ 4.8V, .15 sec/60° @ 6V
* Dimensions (WxLxH):0.58 x 1.30 x 1.02
* Weight:1.04 oz
* Bushing Or Bearing:Bearing
* Bearing

ual
* Motor Type:Coreless
* Gear Type:Metal
I really would like a bit more then 75 oz. Any alternatives?