Mailing List flyrotary@lancaironline.net Message #8738
From: Russell Duffy <13brv3@bellsouth.net>
Subject: RE: [FlyRotary] Re: Rev-2.1 part 1
Date: Mon, 31 May 2004 21:43:39 -0500
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Message
Your new intake looks good from the bottom, err I guess for you, its the side {:>).  Lets see some of the other side.
I don't think working on these fiberglass ducts is going to substitute for flying, I'd come visit you, but its a single seater {:<( 
 
Hey, I've got duct tape.  I can tape you to the belly :-)   
 
Thanks.  Let me know if you want any other pics. 
 
I am thinking about something along the same lines for my next manifold.  Part of the lack of any thing (increase or decrease) in the air with my variable manifold I believe in part due to having the two tubes too close.  The turn at the top was so tight that it probably looked a lot like the end of a tube to the wave.  Also I know the bottom manifold was bad for air flow.  
 
I was sorry to hear that didn't work as well as you had hoped, but since it works on the ground, it must be capable of working in the air too.  I'm sure this isn't he first disappointment you've had, and you'll overcome it.  
 
Using the IDA type manifold spreads the tubes from 90mm CL to 120 mm CL apart and that would permit a gentler bend for the wave.  Well, something to do when I get finished with the ducts. 
 
I really like the fit of the Mazdatrix intake for a 4-port engine.  The port match is good, and the shape of the curves is nice.   It's a good starting point for an intake.
 
BTW, are you worried about your 1.75" runners being restrictive when you go to the -C drive, and 7000+ rpm?    
 
So keep reporting as I am very interested. 
 
You know there's no avoiding it :-) 
 
Rusty
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