Something that i do not really undestand came out after the reading of the bmw801 and the merlin 61/65/70/75 manual.
Maybe you'll be able to help me with that one!
In the 801 manual, the power quoted is 1730PS ON THE PROPELLER, i will call that "final power".
In the Merlin manual,the power quoted for the M61 is 1400BHP.
Now, the pb lies in the fact that the definition of the BHP is (from Wiki, but seems to be the same everwhere):
Brake horsepower (bhp) is the measure of an engine's horsepower without the loss in power caused by the gearbox, generator, differential, water pump, and other auxiliary components such as alternator, power steering, and AC compressor. Thus the prefix "brake" refers to where the power is measured: at the engine's output shaft, as on an engine dynamometer. The actual horsepower delivered to the driving wheels is less. An engine would have to be retested to obtain a rating in another system. The term "brake" refers to the original use of a band brake to measure torque during the test (which is multiplied by the engine RPM and a scaling constant to give horsepower).
now, i suppose (and only suppose) that if the BHP definition is right, in this case, we have to replace the wheels and gearbox with the reductor and the propeller.
So, my pb here is: if the BHP definition is right, was was the Final power of the merlin61? (in this case ,only as exemple)
How much power loss was due to the reductor and propeller?
Thanks for helping me out with that one
(1PS=0.7355Kw)
( =0.98632Hp)
(1BHP=0.7457Kw)
( =1.01389PS)
Maybe you'll be able to help me with that one!
In the 801 manual, the power quoted is 1730PS ON THE PROPELLER, i will call that "final power".
In the Merlin manual,the power quoted for the M61 is 1400BHP.
Now, the pb lies in the fact that the definition of the BHP is (from Wiki, but seems to be the same everwhere):
Brake horsepower (bhp) is the measure of an engine's horsepower without the loss in power caused by the gearbox, generator, differential, water pump, and other auxiliary components such as alternator, power steering, and AC compressor. Thus the prefix "brake" refers to where the power is measured: at the engine's output shaft, as on an engine dynamometer. The actual horsepower delivered to the driving wheels is less. An engine would have to be retested to obtain a rating in another system. The term "brake" refers to the original use of a band brake to measure torque during the test (which is multiplied by the engine RPM and a scaling constant to give horsepower).
now, i suppose (and only suppose) that if the BHP definition is right, in this case, we have to replace the wheels and gearbox with the reductor and the propeller.
So, my pb here is: if the BHP definition is right, was was the Final power of the merlin61? (in this case ,only as exemple)
How much power loss was due to the reductor and propeller?
Thanks for helping me out with that one
(1PS=0.7355Kw)
( =0.98632Hp)
(1BHP=0.7457Kw)
( =1.01389PS)