Turrbie@aol.com wrote:

Paul,
After viewing the picture of how the 20b eccentric shaft was laid out, I
became curious on the details of how the single rotor shaft is done.  The
biggest puzzle to me is how the oil jet is positioned for the rotor cooling
oil. There isn't as much room between the rear main bearing and the rotor to
place such a jet. Anybody know?

What is the lobe separation and firing order on a 20b?  120 degrees, 1-2-3?
Bruce Turrentine

Perhaps Paul Yaw or  Gerry Hess <GVH@yellowknife.com
can answer the one rotor question.

Here is the various arrangements and balance of
all the configurations.

I would guess the firing order is 123.
The three rotor is indeed 120 degrees.

balchart.jpg

Paul Lamar

 
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