Temperature penality on turbine heli
Temperature penality on turbine heli
(OP)
Does anyone know the weight penalty for a one degree outside temp increase if at max take off. Especially a sk76. If not, any other reference such as a chart or equation. Thank you very much.





RE: Temperature penality on turbine heli
Why don't you do a web search on density altitude?
B.E.
RE: Temperature penality on turbine heli
RE: Temperature penality on turbine heli
RE: Temperature penality on turbine heli
Also, which model do you mean? The (twin engined) SK-76 has been around a long time. The maximum certificated gross weight of 'A' models is 10,800 lbs whereas on the later SK-76s (B, C, C+) it is 11,700 lbs.
The limiting factor is usually transmission torque (100/100%), limited by the pilot watching the Tq gauge and moderating his input on the collective lever. The engines automatically give whatever power is required to achieve the torque output.
If it helps, the C+ can maintain guaranteed safe single engine performance at max gross weight of 11,700 lbs up to an outside air temperature of 30C at sea level for takeoff over a clear area. Above that, max gross weight must be reduced in order to guarantee certified performance. The max. ambient temperature limit is plus 50C, towards which the gross weight should be reduced incrementally to 10,200 lbs.
PEW