Carrico Todd wrote:

he had the pilots change from running 22" at 2200 rpm
to running only 1600 rpm. The history of the 475th Fighter Group
(http:/ / www.475thfg.org/ lindbergh.htm) states that Lindbergh
recommended that they slightly increase manifold pressure as
well.

According to the web site:
"reduce the standard 2,200 rpm to 1,600, set fuel mixtures to "auto-lean,"
and slightly increase manifold pressures."

I read an article where the author was comparing bearing loads.  The "over
square" operation actualy reduced bearing loads.

In this article the author surmized that Lindberg would set RPM and then
increase manifold pressure to keep up with the rest of the flight.  He did
not have specific numbers that I recall.  For the same power output, the
oversquare engine was turning less RPM.  Centrifical force of the faster
turning engine actually casued higher loads on the bearings.  The article
was trying to point out that there was not a mechanical explanation for
"Over-square".

Acording to the 475th web site the information was in the flight manual all
along, and Linberg used this as suport of his theory.

I wonder how this approach would look when using the Rotary for comparison.
Do we know more about the affects fo "boost" than we did in WWII, or is this
just like the water cooling information (We forgot the good stuff when jets
came along)

tc

 
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