RE: Info on a GP engine needed
In reality, it is not 1.45, nor is it 2.45 HP for a .91 two-stroke engine.
The 'rated' HP numbers advertised by most glow engine manufacturers, cannot be produced by the engine, in any realistic situation, as it comes equipped from the factory...
If one shims-up the head, loads the tank with the highest nitro fuel recommended AND installs an optimally length-adjusted open tuned-pipe, the engine might make that output on a 'toothpick' prop, that no-one will bother to fly a normal model with...
For most .46 engines, 0.9 - 1.1 HP are achievable, while spinning usable size props (10x6 - 11x7).
A .91 two-stroke engine, running on a muffler, will typically make ~1.8 HP and with a tuned muffler; about 2.0 - 2.2HP.
EDIT: Language...