>> What torque pulses? Today was the first run with the complete engine in
>> flight configuration,
>> meaning engine - psru - prop. No vibration out of the ordinary. It, off
>> curse, is shaking
>> at 1300 RPM idle, just as my Soob does. Once it goes over 1700 running
>> like an electric
>> motor, almost. Didn't go over 5k yet, have to make sure everything >> stays
>> together.
>> I am using the testing now for power optimizing and just running it >> until
>> something
>> wears out or brakes. In the meantime the flyable components still >> missing
>> will be
>> designed and built for the final configuration.
>>
>> Richard Sohn
>> N2071U
>
>> This is a p-port engine folks.
>>
>> Paul Lamar ...No rotor no motor.
>
> Congratulations!
>
> A p-port no less. Carb or FI?
>
> Doc Custer
> Retired Software Engineer and sometime Audiologist
>
> Its a carb.
>
> --
> Paul Lamar ...No rotor no motor.

The intake system  is not final. I am presently running a 36mm Mikuni,
flowing 5gph gas at 5000rpm.

Richard


What Richard is saying here is 5 gph is 30 pounds per hour at a BSFC
 of .5 that is about 60 HP. 36 mm is of course about 1.4 inches in diameter
so this will give you a good idea how much HP a 2 rotor p-port engine with that size
runner will generate at 5000 RPM. Probably a bit more with a longer runner
around 30 inches. So for a two rotor you are looking at 120 HP at 5000 RPM.
Assuming for the moment the HP curve is still a straight line at 5000 to 6500 RPM
you will get 156 HP at 6500 RPM. If the straight line function still holds 168 HP at
7000 RPM.

1.400 inches inside diameter has an area of 1.54 square inches.
1.875 inches inside diameter has an area of 2.76. Pushing the linear extrapolation
envelope here..... the HP for the larger dia. runner P-port is then estimated
at 300 HP. We are NOT getting that. We are getting 240 HP on the dyno so obviously
power is not directly proportional to intake port area. We are now obviously
in the convex portion of the p-port HP curve.

Paul Lamar ...No rotor no motor.


How are you connecting the reduction to the output shaft?  Can we get
some pics of that?  Is that a Notax C box?

What are your weights coming in at, NOT counting the reduction?

Keith

My e-shaft has a Rotax style 10 : 1 taper.
The gear box is a Hirth G40, which also has a 10 : 1 taper at the input.
There is no need for any extra coupling.
The engine with fly wheel and waterpump on it is 90 lb. I am expecting 170lb
FF.

Richard


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