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Date: Tue, 19 Jun 2007 11:20:37 -0600
From: H & J Johnson <hjjohnson@sasktel.net>
Subject: Re: [FlyRotary] Different Rotary Port configurations
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Hey Bill, it's been a while. So, in essense you should be able to negate the issue via intake and exhaust lengths. Sorta like a 2 stroke.. do we have any data to show exactly what that would be or is this more of a guess number? I remember Ed doing a trial w/ a variable length intake to solve this question but I don't remember the results. If a person could make it work it'd sure help I'm sure. 

Also, has anyone ever done anything like Kent Paser did w/ his Mustang II exhaust? [He wrote the book "Speed with Economy"] He put small cones in the end of the exhaust which bolted up to the block. The exhaust ran through these but because of their shape they would not allow a reflected wave to re-enter the port, this created a lower pressure exhaust which scavenged the cylinder better. He's flying w/ a 0-320 but the theory might work w/ a 13b?

The Mill is coming along very well. I took the time to add a movable console on a track, mounted on the side of the machine. This will allow me to traverse the console down the length and save walking 30+ft each time I want to touch off a part. The wiring is done, w/ the exception of the 240vac plug on the end of the power cable [I couldn't find it last night at 11pm] and the limit switchs, which have the wire run, I just need to mount the switchs and wire them into the control [12 wires to connect ttl]
I've had it running but took it down to install the console. [which took about 4 months longer than I planned.] As always, time is in short supply in the summer, I'm still working two jobs and getting ready for a new addition to the family in a month here so things just take longer than planned. Anyway I'm still working on getting a website up.. the last guy who was going to do it for me bailed so.. gotta find someone else :-) All in all.. I'm happy w/ it.. I just can't wait to start making parts w/ it.. d:-)

Best
Jarrett


> 
> 
> Hi Jarrett,
> How's the "big machine" install coming along? The key to the 
> overlap 
> problem is proper exhaust tuning. If the out flow of the exhaust 
> is 
> adaquate there will be very little cross flow. In fact the outflow 
> can 
> assist the intake. My "best" system would be direct injected so 
> there 
> wouldn't be any fuel in the intake charge.
> Bill Jepson