Terence Wilson wrote:
On Sun, 20 Jul 2008 08:31:45 -0500, "Steven P. McNicoll"
wrote:

Terence Wilson wrote:

In the course of trying to understand how a constant speed prop
works I came across the following passage in one of the Jeppesen
books:

"If the throttle is advanced without decreasing the pitch of the
prop blades to increase ___ rpm, the manifold pressure increases as
the prop mechanism attempts to keep ___ rpm constant by increasing
the blade angle. The combination of high manifold pressure and low
___ rpm can cause damage due to high internal manifold pressures."

I found this paragraph to be confusing because it makes several
references to rpm but doesn't clarify whether it is engine or prop
rpm. The blanks were inserted by me. Can someone help me out?

Thanks in advance.


It's engine rpm

Just to clarify, it's engine rpm for all the blanks?


Yes. Or propeller. Either would be correct as there is a fixed ratio
between engine rpm and prop rpm. In a direct drive engine that ratio is 1.