On Sun, 20 Mar 2005 03:35:51 GMT, "tony thomas"
wrote:

~` snippage ~~

There is no way to know what is the correct prop without knowing how many
rpms your turning at wide open throttle. You select prop based on max rpms.
You want the engine to run in the power band.

Now this is interesting. I've always assumed that the power band is
exactly that - a range of RPM in which the real horsepower is being
generated - it would follow that the power band would fall off going
towards WOT rather than being the peak of the band.

Yes/No?

Later,

Tom

On a car engine the max hp may be at 3000 rpms but red line is 5000.
On an outboard the rated hp is at the rated max rpm. For example. A 1990
Evinrude/Johnson 200 was rated at 5000 rpms. However at 6200 rpms the
engine would crank out 220 hp or more.
Every engine is different but in general a 2 stroke makes its max hp on the
top end. A 4 stroke makes its max hp at a rpm specified by the cam profile.

--
Tony
my boats and cars at http://t.thomas.home.mchsi.com
"Short Wave Sportfishing" wrote in message
...
On Sun, 20 Mar 2005 03:35:51 GMT, "tony thomas"
wrote:

~` snippage ~~

There is no way to know what is the correct prop without knowing how many
rpms your turning at wide open throttle. You select prop based on max
rpms.
You want the engine to run in the power band.

Now this is interesting. I've always assumed that the power band is
exactly that - a range of RPM in which the real horsepower is being
generated - it would follow that the power band would fall off going
towards WOT rather than being the peak of the band.

Yes/No?

Later,

Tom

On Sun, 20 Mar 2005 16:09:18 GMT, "tony thomas"
wrote:

~~ snippage ~~

Every engine is different but in general a 2 stroke makes its max hp on the
top end. A 4 stroke makes its max hp at a rpm specified by the cam profile

I should have thought of the way two strokes make power - your right
of course.

D'Oh!!!

Later,

Tom