George,

 

I had focused on the 38mm and was doing pretty good with it, until I realized I could not maintain a good mixture over the whole operating range. Obviously, that is why the specification says it is good for up to 65hp.

Even so the carb is 44mm now, my intake runner is still 38mm maintaining the intake tuning.

 

Richard Sohn
N2071U

----- Original Message -----

From: George Lendich

To: Rotary motors in aircraft

Sent: Monday, June 21, 2010 4:59 PM

Subject: [FlyRotary] Re: Peripheral Port 13B Rotary Engine

 

Richard,

Ah The magic 44mm. I know you are running a 12A but at what rpm are you running out of breathing, provided you have had the single that high. I would have to run the numbers but thought you would get away with a 38/40mm carb and push up the velocity. 

George (down under),

 

this flywheel is my design, it is steel with the cut outs for balancing. The steel section is 14mm thick, and the ring gear is 250mm diameter, coming off a Metro Geo engine.

I calculated my hp from fuel flow using a BFSC of .5 . May be a little optimistic. Mixture was slightly rich at the tests.

I am running now a Mikuni VM44 carb.

 

Richard Sohn
N2071U

 

 

----- Original Message -----

From: George Lendich

To: Rotary motors in aircraft

Sent: Monday, June 21, 2010 3:39 AM

Subject: [FlyRotary] Re: Peripheral Port 13B Rotary Engine

 Richard,

We seem to be singing from the same sheet of music in regard to projected HP at RPM, at optimum performance. So what weight have you got on that flywheel, it seems to be a cut down manual cast flywheel from a past photo. I figured I might need a heavier flywheel than the flexplate and was considering having one of those aftermarket steel ones made and have mounting holes included to suite what ever damper I incorporate.

BTW this is single rotor specific if anyone was confused.

George (down under)

Is anyone flying with a Mazda 13B peripheral port engine?  If so, how is it working?  Can you describe the advantages and disadvantages?

 

Thanks,

 

Bob Rogers