rijakits wrote:

Hi Paul,

glad you made it back and curious on all the news from the

Mazda-Universe!

Recently someone mentioned that on the 13B or Renesis size engine the

main bearing loads go nearly t ozero around 6500 rpm.

I think you posted a graph to this.
I thought I saved this post, but can't find it.

Could you please point me to that info again and also WHY the loads seem

to disappear?

Thanks,

Thomas J.

They don't go to zero but the combustion force tends to cancel the

centrifugal force

depending on the weight of the rotors. It varies from year to year. This

is

published in Mazda SAE papers or the book Rotary Engine. The equivalent

number

is about 3600 RPM for a piston engine. Also this is the RPM limitation to

the rotary.

Paul Lamar

Thanks for the quick reply!
What do you mean with rpm limitation to the rotary 3600 rpm?? Is that shaft
rpm or Rotor rpm?
Or do you mean generally when centrifugal overcomes combustion sooner or
later this will "get" the engine?
If so could you recall some general rpm limits for different racing classes?
I guess in 1/4 mile straight runs the rpm limits are quite bit higher than
in road racing?

Thanks,
Thomas J.

Shaft RPM. The rotor RPM is 1/3 shaft RPM. The weight of the rotor causes
high centrifugal loads on the rotor bearings at high RPM above 11,000 to 12,000 RPM.
That is why the racing guys use high oil pressures in the neighborhood of 100 psi.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2003 All world wide rights reserved.