If you want to use a .40, the LT -40 would be a better choice. I have had both planes and presently have a tailwheel version of the LT-40 under construction. I think I like the lighter balsa construction of the LT-25 better than tha plywood used in the fuselage of the LT-40, but the 40 is probably stronger.

Either one is a blast to fly, and large enough to be easy to see.

Larry