Well Mark as the late great jimmy Durante would say its all about the all about the 'Schnozzola' the nose, the airplanes nose that is. You have been talking a lot in a number of forums about two airplanes (and that's great), Of course the two are the large Cub and the Cadet senior. Now when you asked about the Cubs and what type gas engines I agreed with many here that the 20cc is two large but I felt that the an OS 15 was ideal and first one reason I like the OS best is that it has an OS carb in the front unlike some others. a rear rotor or reed valve engine normally has the carb in the rear and this can present installations problems. So ya the OS 15 is perfect in the Senior Cadet and the installation is easy, remember I have and fly one.

Now lets talk about that same OS 15 in that Cub Well maybe not at least not for me and here is why. The power match would be perfect "BUT" IT s its all about that nose. Look at the Senior Cadet: That nose is as wide as that naturally already wide fuselage and its easy to fit anything from a small glow .35 which I have done all the way up to the .15 gassor But now lets look at that Cub at least the J-2's to the J-5's full scale versons (note the Senior Cadet is not a scale airplane of anything) The scale cowling on any of those versions will have a cowl that goes from a narrow fuselage down to a vary narrow width just enough to cover the crankcase nothing more. The cylinders are left entirely in the breeze and just some sheet scoops on top called the "eyebrows".

Now normally on most cub J-2,3,5"s models the engines are normally mounted sticking out the right side and some sort of detailing on the left side to simulate the lovely cylinders. When engines very large are used too much of the little cowling needs to be cut away. In some cases you can use some gassers that are rear Carb and that carb can stick out on the left side. to simulate the left cylinders.

So to answer question about that .65LA for that ninty inch Cub. While it would have no fit problems but I feel it would just be a little to lethargic for that ninety inch Cub and you would soon be bored with it. If you no objections to two stroke I feel that either the .75AX or the OS .95AX would be just right.

John