I ran in my new TT 61 PRO yesterday.

The Engine appears to have the same quality as O.S. Max.
I used an OS helicopter carburetor (60K) and two different mufflers. The OS standard muffler and the Jett-Stream muffler.


Prop: 11x8 Graupner grey

Fuel: 20% Castor 80% methanol FAI mix

Plug: Enya 3

Temp: 68°F

Height: 300ft

After about 10 oz of fuel I got the following readings:

OS stock muffler: 11200 rpm

Jett-Stream muffler: 12900 rpm