flyrotary@lancaironline.net Mailing List Archive

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 -------------------------------------------------------------------------------- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html