There are two basic types of .40 engines from OS. One is a bushing engine FP and the other is a ball bearing engineSF,. Both are worth $40 and can be used in a number of RC aircraft. Some examples would be:

PT-40, Ugly Stick 40, almost any lightly built .40 size kit can be flown with these engines and don't break the bank on fuel.

If you don't buy it send me the address off line please


Philip in Texas