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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2020822@logan.com>
Subject: Re: [FlyRotary] Can anyone tell me if this will work
Date: Wed, 2 May 2007 08:56:29 -0400
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Hi Tony,

This is one time  I agree with the "bearded one".  I tried using the same 
racing beat intake on two different intake designs - one using a 4 injector 
TWM Weber Throttle body and another using my own intake design.  This set up 
apparently workes well for the rotary road racers who could wind the engine 
past 9000 rpm.  However, it simply did not work well for me at our rpm 
regime.

  My conclusion was that the short, wide passages reduced the air/mixture 
velocity and thereby reduced  the amount of air/fuel mixture the inertia of 
the airstream could force into the combustion chamber.  When I redesigned my 
intake to use long, 1.25 and 1.5 inch dia tubes the low end torque and 
static rpm  improved considerably and so did aircraft performance.

However, your  set up will work, I just do not believe it is optimum for our 
rpm regime.

Also you may find the  rotor (next to the prop) may receive less air than 
your other rotor due to the curve of your plenum.  I would make the shallow 
end a bit more rounded (more height) than shown.  I presume you are going to 
make use of the ram air effect based on the orientation of your intake?

Tracy Crook found that using a short  RAM plenum did provide additional 
manifold pressure but the effect was mainly noticeable at air speeds around 
200 mph and higher.  He found that he gave up some lower rpm performance 
using this set up.  His intake on the Renesis is shaped (on the outside) 
rather like a enlarged shoe box - my guess is that he uses this plenum as a 
diffuser to convert the RAM air energy into increased static pressure inside 
the shoe box where it is then fed into his TB.  If memory serves me correct, 
he has reported close to 1 - 1 1/2" manifold pressure increase at high 
speeds - Tracy, step in if I am in error.

So it may be that given that your airframe is a Long EZ, this set up will 
likely work better at your higher cruise speed than it did on my slower RV.

Nice looking installation.  I do not recall anyone with a rotary in a Long 
EZ since Al Gowan, so will be very interested in hearing about your success 
when you get it airborne.

Ed

Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.dmack.net/mazda/index.html


----- Original Message ----- 
From: <tonyslongez@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, May 02, 2007 2:17 AM
Subject: [FlyRotary] Can anyone tell me if this will work


> what I'm trying to do is figure out how to set up my racing beat intake 
> without the intake tubes going over the top. the (bearded one) says it 
> will work but is only for engines in the 10,000 RPM range and it's not 
> good for 6500 -7000. does anyone. have any other suggestions. I will use 
> four injectors but what I want to do is keep the profile as low as 
> possible.
>
> BTW this is for a Long Ez I'm thinking forced air injection
>
> Tony


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