Tudor Miron wrote:
As I understand lengthening the rotor has almost linear relation with safe
available RPM that leads to almost linear relation with power?
What are other limiting factors? How much that phasing gear + hardware
weights? Are there drawings of those spring pins and why they are springed -
I understand that they are damping some sort of rotor lateral
vibration/misalignment
or waht there is, but what causes it and how it is related with rotor weight?
Reducing the rotor weight we're going to reduce the loads those pins have to
deal with.
What about automotive applications? We still need torque down low so some sort
of turbo is inevitable. But may be it's going to be a bit different than
current common practice?
3 rotor engine - how much RPM we can safely have with 6 lbs rotors? How
much power can we expect? What kind and how should we configure the turbines
to have lots of low end torque, excellent tractability and crazy power up high?

Remember I'm not an engine guy and I will definitely outsource engine
building to reputable shop. But I want to know as much as possible to set
realistic targets and requirements.
Thank You
Ted
The load on the rotor bearings is m*V^2 m vee squared.
m is the mass of the rotor. V is the velocity around the circle
path of the CG of the rotor.
So the RPM is the square root of the difference in rotor weight.
7/9 is .777 so my guess is 10 to 15% more RPM and power.
I would say maybe 12,000 RPM for a 7 pound rotor.
Normally aspirated it would be about 450 HP times 1.15
or about 520 HP for a 3 rotor. Turbo charged on alcohol and
nitrous oxide about 1400 HP.
For a 6 pound rotor 6/9 is maybe 25% more RPM or about 13,000 RPM.
HP 450 times 1.25 or about 560 HP.
Beryllium aluminum alloy rotor (density .076 pounds per cubic inch cast iron is
.3) would be one quarter the weight so the RPM would double and so too the HP.
Go for the gold :)
Those are off the shelf spring pins available world wide.
Paul Lamar
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