yapjy
Key Veteran
Location: Singapore
My Posts This: Topic Forum | 93T Main and 11T pinionI fly F3C and I'm using 93T main and 11T pinion. (i.e gear ration is 8.45)
This gives a rotorhead rpm of ~1900 when running at the OS70 optimum rpm of 16000.
Of course I use 1900 rpm for headspeed while the Freya is upstairs. Consecutive loops and rolls are good and it can only screw up if you pump the collective too much.
While hovering at ~1550rpm, the OS70 runs at ~13000rpm which is very smooth. Anyway, there's no need for the power while hovering.
The max rpm for the OS70 is 18000.
I felt that the OS70 will run better with 20% or 30% nitromethane fuel. It feels sluggish if runs on 15% nitromethane.
Hope that this helps. |
