Hello,

Two years ago, I bought a new Super Tigre GS.40 from Tower ($49.99).  I ran it briefly on my test stand and that was it.  I put it back in the box and on the shelf.   At 13.05 oz. without a muffler, I figured it was way too heavy for a stunt plane.

I have more planes than engines. One of those planes without an engine is a Brodak P-40. Recently, I decided to try out the St.40 on that plane.  I borrowed the venturi, NVA and Adamisin muffler from my ST control line .51 and installed them on the ST.40.  Went to the field this past Saturday and gave it a try.  What a powerful engine!  4.2 second laps with an APC 10.5X4.5 prop. on 60' lines.  Ended up with an APC 12X4 and, after several needle adjustment flights, I got it slowed to 5.3 second laps.  Not a dramatic 4 to 2 cycle break but it's there.  Pulls the plane effortlessly  straight up and through tight turns. The fuel I'm using is 10% nitro with 22% oil. (11 castor/11% syn.).

With this engine the P-40 is nose heavy but, at least for me, the plane handles very well.

I didn't expect much out of the ST.40 but now I'm quite happy with it.

I'm not saying that a GS.40 will make a great competition engine for everyone.  It is heavy but if you are looking for an inexpensive engine that performs really well, you might want to give this thing a try.

Joe

Forgot to add that, if you want to use a tube type muffler, the muffler for the Tower 46  bolts right on and eliminates that silly stack deal.  The muffler is long, but fairly light, and quietens the engine better than the ST "Silent muffler".  Glen