The ST90 is the same size and weight as any of the current 60's (20.7 oz without muffler), so it's not an issue for me. With a Jett muffler it turns similar RPM as many of the screaming 60's and can also compete with the early long stroke 60's on the bigger props (on a standard muffler, not the Jett). I think the Hanno Special was a bit stronger, but it also ran a full pipe compared to the 90 on a muffler. I am going to be running in a NIB 90 this spring and I am going to try an experiment with a mousse can pipe on the stand to see how it does with that instead of a pipe or muffler. It may become my standard exhaust for the 90 if it works, it should give excellent performance and weigh almost nothing. I had a ST90 on a CG Ultimate bipe years ago and it ran very strong until I dumb thumbed it into the dirt one day. These engines are a well-kept secret, being very reasonably priced and running strong. If you are not stuck with a displacement limit and can live with the side exhaust configuration, they are a great deal.

Skylane, I bought the Deception plans from MAN and someone sent me a scan of the Tipo plans (I can't recall who, it was a couple of years ago).


Mark