On Sat, 18 Mar 2006 01:20:59 +0000, Mark Rand
wrote:

On Fri, 17 Mar 2006 11:39:22 GMT, wwsjr wrote:

.


Horsepower is an extrapolation to describe output condition at a point
in time. A marketing number, hence: "horse."
Torque is a constant over time, above time. The usable number.
HP curves describe volumetric effenciency, tunable over a wide range.
A 1 cu. in. model engine can produce 5 HP. At 25,000 rpm. But not enough
torque to power a go cart.


That's what gearboxes are for :-|


Mark Rand
RTFM
Conversely, you can hang a V8 block from the end of a lever and
produce 1200 ft lbs of torque - it will move the go-cart a couple of
feet when you let it drop. No speed - no power.

That 5 HP 25000 RPM engine is producing just a hair over 1 ft lb of
torque at that RPM, and may produce 2 ft lbs at 12,500 for 4.6 HP. It
MIGHT even produce 3.5 ft lbs at 6000 RPM for 3.9HP

It will still be rated as a 5HP engine, when in reality, it is a real
nice 3.5 HP engine. The rating will be; A, accurate, and B,
Misleading, at the same time.
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