The following is from the Sky Ranch Engineering Manual written by John
Schwaner.
Page 436, chapter 11 entitled "forces, vibration and Balance."
"With four-cylinder engines the propeller can be indexed so the blade
center lines are contained in the plane of the crank pins. This means tht
the propeller blades are horizontal when any cylinder is at the top of the
compression stroke. This is the point of minimum crankshaft rotation
inertia. Historically, propellers are indexed 60 degrees ahead of
horizontal so the propeller is in a convenient position for hand propping.
However, if you do not intend to hand-prop the engine, this index
configuration will minimize transmitted vibration levels."
This book is a very good reference manual for anyone who wants to know
more
about their engine, why it works and why it failed. It is very detailed
covering; fatigue analysis, engine inspection, engine performance,
cylinder
repairs, lubricants and wear, hose assemblies, fastners and failures,
calibration, troubleshooting, performance limits and forces, vibration and
balance.
I got mine from Sacramento Sky Ranch, (916)421-7672.
Richard Blair
N99997 - 415D
St. Marys, Ga. 4J6
[EMAIL PROTECTED]
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