Mr Selfish,
I didn't have a Beta II chart handy. Just wanted to show that alpinehelicopter was hovering at or close to full throttle.
All those graphs and figures assume a perfect engine, (and correct weights!?). It only needs the timing or valve adjustment to be slightly out (even old oil) and you've got less power than expected.
Maybe the engine was hot from being over worked at that PA?
I still think he overpitched. Carb icing is for small throttle openings, where the pressure difference across the butterfly is great.
Either way I don't think he's gonna strip the engine. . .
