BTW, Tower lists the Fox .35 in their catalog. It's about the same price. That adds a third engine to the list.

If I were going to buy one of the three, my first choice would be the OS40LA-S. It probably will run much like the 35S of old.

Super Tigre's popular CL stunt engines were pretty much just one, the 46, that would come close to fitting a Ringmaster. It was a hugely popular engine. I would bet that this new one probably isn't very much like the original. But I don't have any experience with the Chinese tigres. So it's just a guess.

I really wouldn't bother with the Fox.