BTW, what is the advertised weight of that Tigre?

Tower shows the RC 40 at just under 20oz. The OS40LA-S shows a weight with muffler of 12oz. The ringmaster was designed for engines around 9 ounces without a muffler.

The OS25 actually is 9oz with it's muffler. And would work on the Ringmaster great.

I'd think the OS40 would do well, but would also do great if you moved on to Nobler etc.