Mailing List flyrotary@lancaironline.net Message #20236
From: Richard Sohn <unicorn@gdsys.net>
Subject: Re: [FlyRotary] Re: Fw: Rx-8 Rotors useable in 91 13B?
Date: Wed, 13 Apr 2005 22:45:11 -0700
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Kelly,
absolutely!
 
Richard Sohn
N-2071U
 
 
----- Original Message -----
Sent: Wednesday, April 13, 2005 6:41 PM
Subject: [FlyRotary] Re: Fw: Rx-8 Rotors useable in 91 13B?

Richard,
     But we would include the side seals and springs ,end seals,springs (and plugs ),
and oil seal rings and respective O-rings ? Is that asumption correct ?
--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2




-------------- Original message from "richard sohn" <unicorn@gdsys.net>: --------------

George,
I got the information from my engineering education, and also Leon confirmed it in one of his recent postings on the subject.
One more thing, the difference between the two rotors balancing each other and needing balance weights anyway, is static balancing vs. dynamic balancing.
 
Richard Sohn
N-2071U
----- Original Message -----
Sent: Wednesday, April 13, 2005 5:02 PM
Subject: [FlyRotary] Re: Fw: Rx-8 Rotors useable in 91 13B?

Richard,
This goes against my advice as all components in movement affect the rotating mass.
It would be like not allowing for rings in a piston in the balance equation.
However I will check on that aspect. Where did you obtain that information
George ( down under)
Sent: Wednesday, April 13, 2005 12:02 AM
Subject: [FlyRotary] Re: Fw: Rx-8 Rotors useable in 91 13B?

Bill,
If you find out before I do will you let me know about the additional depth to be cut.
On the balancing; I have to cover all that with my one rotor ( no biggie), I can give you all that stuff a little down the track it will only require lightening the counter balance weights a little.
 
The e-shaft is the same, the rotors lighter = lighter balance weights.
There may be some oil volume difference (read weight) , but I should have that soon, as well the rotor weight. BTW Tracy's apex seals are 33 grams ( per rotor) - got them to-day.
 
Has anyone got a set of new Mazda apex seals handy to weigh - I guess there wouldn't be much in it anyway - just curious!
 
George ( down under) 
I am going to look into this a bit more and find out how much to mill a rotor.  A lighter rotor => more rpms without increasing stress?
 
Ed Don't forget lighter rotors would require different balance weights. I have heard from various sources that the Renesis rotor was lighter and then that they weigh the same! Both from usually reliable sources, go figure.
Bill Jepson
 
George,
the apex seals do not go into the balance equation because they are not attached to the rotor.
Just my 2c.
 
Richard Sohn
N-2071U
 
 
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