I just mounted an OS 50 SX engine on the stock motor mount that comes with the ARF. I made a mistake and the left part of the motor mount is about 1/16 to 1/8 of an inch forward of the right part creating some left thrust. I have a large washer that will fill the gap and make it flush. Is there any problem with doing it like this? How about using 2 or 3 smaller washers instead of a larger one? By using smaller washers or by getting larger washers I can put in some right thrust.

Using washers to adjust the thrust is fine.

Whatever you do, don't leave it with the left thrust though!. That will definitely give you problems when flying!

-David C.

If your description of left and right is from the pilots point of view (as sitting in the cockpit) then you have right thrust which is what you want.

Good point! I didn't notice that!



-DC

No, I really mean LEFT thrust.

I'm helping a friend build this SE and I am trying to get this bird perfect. Can there be too many washers? 1/4 of an inch is the absolute most it will be spaced... but 1/8 is a more realistic number. 1 large washer puts it where it needs to go in this case.

You might consider a thicker spacer than a washer, but even washers should be OK as long as the bolts are tight enough, and the washers aren't pushed into the ply of the bulkhead.

-David C.

RS2K,
No offense but if your first post was worded correctly then you have left and right on an airplane mixed up. When you stated that the left side of the motor mount was forward of the right side were you facing the front of the plane perhaps? When you are facing the front, your left is the plane's right. Again, I'm not trying to be sarcastic, just trying to understand the condition that you actually have. At any rate, washers will be fine as mentioned.

No offense taken. When ever I talk about left and right I talk as if I am in the pilots seat. When I said the left part of the motor mount was causing left thrust, I meant that if I was in the pilots seat the left part of the motor mount was pushed forward about 1/8th of an inch causing the nose of the engine to move toward the left. Sorry, about the confusion. In the end 2 washers was all it needed to give it about 1 or 2 degrees of right thrust.