"Thomas Tornblom" -to-reply wrote in message
...
Steve writes:

Sport Pilot wrote:


More speed is NOT more power any more than more torque at the same
speed is more power.

uh?


Yeah, that was my reaction! (?) ;-)


More torque at the same speed *is* more power.

power = torque * speed

Had the gas engine produced the same torque at 5000 rpms as the diesel
do at 2900, then it would have had about 560 hp at 5000.

Thomas

Actually, the equation to calculate power (or horsepower (HP) in this case)
is HP = Torque X rpm / 5252.

Torque being a measurable force that turns the crankshaft and ultimately the
wheels, main rotor, or propeller (I just noticed that this is going to two
aviation and one automotive newsgroups). Horsepower is defined as a
"measurement" of work performed. By the equation, at least as it applies to
internal combustion reciprocating engines, you can't have HP without torque!
So, if you can increase the torque value at a given rpm, you'll increase the
power output at that rpm. Likewise, if you can maintain a given torque
value at a higher rpm, you'll produce more power in that case too. It
doesn't matter what kind of engine you're talking about or the fuel burned.
Gasoline, diesel, methanol, it makes no difference. The equation still
applies.

FWIW!
Fly/Drive Safe,
Steve R.