It IS simple. You are not getting 100% horsepower at takeoff. You
are inventing the need for the constant speed prop. Great example
is the 180hp Tiger with a cruise prop!

Now, I want to learn something from this...

Why is it that maximum static RPM is independent of altitude?

Horsepower drops with altitude. But static RPM does not. Horsepower
is related to the cube of RPM for a fixed pitch prop IIRC. Why is it
that static RPM stays constant?

Good thing, actually, or a fixed pitch prop would be practically
useless.

Bill Hale


On Oct 9, 4:51 pm, "Stuart & Kathryn Fields" wrote:
Scott: It is simple. An 0320 is said to be a 150hp engine at 59 degrees,
sea level, short exhaust stacks and a certain humidity. At Rioduoso (sp?)
NM on a hot day the density altitude will make you wish that you had put an
0540 on there even if you have to limit it to 100 hp cause you ain't going
to get 100hp out of the 0320 with a Cessna Exhaust and intake system at a
high density altitude.

Stu Fields
Experimental Helo magazine"Scott" wrote in message

.. .



So why would a guy "upgrade" to an O-320 and limit it to 100 HP? What's
the "gain" ???

Scott

Orval Fairbairn wrote:

The placarding probably relates to the STC, which "limits you to 100 hp",
for certification purposes.

It is easier to get an STC for a higher power engine if you "limit, via
placards, the max power" to that called out in the original type
certificate.

--
Scott
http://corbenflyer.tripod.com/
Gotta Fly or Gonna Die
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