Vance and Emily Jaqua wrote:

Paul - You speak of the limiting speed of the E
shaft? It would seem that the real limiting speed
would be the rotor sliding velocities, and "G"
forces on the seals - much like piston speed is
frequently quoted as limiting piston engine life
(tho piston accelleration is a truer measure).
Do I correctly remember early Mazda engines with
 active rev limiters to protect the earlier seal
configurations and materials ? - Vance

Its the centrifugal loads on the rotor bearings that right
now limit RPM to about 10,000. In your case it would be
less as the drive shaft and u joint add mass in all
the wrong places :-)

Silicon carbide tip seals are half the density of cast
iron so they don't "jump off the hump" at 10,000 RPM.

BTW I figured out how to get rid of the unbalance couple.

Paul Lamar
 
The Aircraft Rotary Engine Newsletter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org