I have a turbine that is claimed to put out 13.9kilos thrust at 10deg C. I do not know at what barometric pressure (altitude) this was at.

Can someone give me the formula for calculating expected thrust at a different temp and baro pressure.

Sure would be nice for all turbine manufacturers to spec their motors at Standard Temp and Pressures.This is the only way to properly claim thrust output for the consumers (I.E. brand "a" turbine claims thrust at 30lb( S.T.P.) , brand "b" claims 30lb BUT AT 10deg C. --brand "b " isn't a true 30lb motor .)

Jake