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Umm, guys? None of the above ... or both?
The rotor does in fact rotate around its own center, which is also the center of the eccentric (offset part of the shaft)
Since the eccentric shaft is also rotating, the center of the rotor is also in constant motion. That is why the shape traced by the apex seals is called a "trochoid ".
Dale R.
COZY MkIV #0497
Ch. 13
Richard Sohn wrote:
Sorry Al,
I was not clear, certainly was meaning to say " around the e-shaft lobe center, however, since the lobe center and the rotor center is co-located with the lobe center, it does rotate around its own center, or not?
Tricky, isn't it.
Richard Sohn
N2071U
----- Original Message ----- From: "Al Gietzen" <ALVentures@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, February 09, 2008 12:28 PM
Subject: [FlyRotary] Re: Rotor Weight Codes
the rotor is not sliding "back and forth" , it only makes a clean circular
motion around its own center. The weight only is significant for the
centrifugal force on the e-shaft lobe.
Richard;
Unless I'm mistaken, or misunderstand what you're saying; the rotor does not
rotate around its own center. And the CM of the rotor does not rotate
around the center of the e-shaft, but rather follows the center of the
e-shaft lobe. Watch the animation on Tracy's web site.
Al
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