Prop to High RPM on downwind

Thomas Borchert writes:

When flying at 2200 RPM or so and going full power you run a
greater risk of breaking something than at full pitch (high RPM).

How?

Some airplanes have limitations on the space of usable RPM-vs-MP
settings. For example, on the pair of IO-540s in mine, prohibit
operation at MP25 with RPM2300, or MP20 with RPM2000. (I believe
the reason relates to resonance.) That is I push the blue levers
forward from 2200RPM (cruise) to do approaches at 2400RPM: this allow
harsher throttle swings if needed.

- FChE

Frank,

very interesting, thanks. Of course, as the first set of limitations
show, this has nothing to do with "oversquare", since the limit starts
at a "serious oversquare" condition.

--
Thomas Borchert (EDDH)

On Fri, 26 Nov 2004 18:23:13 +0100, Thomas Borchert
wrote:

Frank,

very interesting, thanks. Of course, as the first set of limitations
show, this has nothing to do with "oversquare", since the limit starts
at a "serious oversquare" condition.


Does this mean yo now understand my "way over square" comment, and why
I put over square in quotes?

z

Zatatime,

Does this mean yo now understand my "way over square" comment, and why
I put over square in quotes?


I think the word oversquare should never be used in this context, ever.
Too much mischief has been wrought by doing that.

--
Thomas Borchert (EDDH)