X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mx2.netapp.com ([216.240.18.37] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with ESMTPS id 5065209 for flyrotary@lancaironline.net; Wed, 27 Jul 2011 11:04:23 -0400 Received-SPF: softfail receiver=logan.com; client-ip=216.240.18.37; envelope-from=echristley@nc.rr.com X-IronPort-AV: E=Sophos;i="4.67,276,1309762800"; d="scan'208";a="565929629" Received: from smtp1.corp.netapp.com ([10.57.156.124]) by mx2-out.netapp.com with ESMTP; 27 Jul 2011 08:03:19 -0700 Received: from [10.62.16.167] (ernestc-laptop.hq.netapp.com [10.62.16.167]) by smtp1.corp.netapp.com (8.13.1/8.13.1/NTAP-1.6) with ESMTP id p6RF3Ivt018799 for ; Wed, 27 Jul 2011 08:03:19 -0700 (PDT) Message-ID: <4E3028A6.7060002@nc.rr.com> Date: Wed, 27 Jul 2011 11:03:02 -0400 From: Ernest Christley Reply-To: echristley@nc.rr.com User-Agent: Thunderbird 2.0.0.24 (X11/20100623) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Injector mounting in top of block? References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Bryan Winberry wrote: > > Having said that, How many injectors would be required? 4 traditional? > Or would there only be room for two large injectors(one per rotor)? > Effect on staging? > > As usual, I have more questions than solutions. > > Bryan > > > One 1000cc injector per rotor would work, if such a thing is even made. It may be easier to use 4, leaving the stock rotor mounted injectors in place, as they are nearly in the chamber as it is. Staging goes away in every airplane installation I've heard of. The staging is where Mazda closes off one intake in order to keep the velocity up on the other. In conjunction, they have to shut down one bank of injectors. We don't shut off any of the runners, so we don't have to worry about shutting down any injectors. With the MegaSquirt, I alternate between the injectors and I get a very smooth idle down to 800rpm. The other thing that would need to occur is injector timing. The benefit for a rotary is to try to keep fuel away from the apex seal area. If you can spray the the fuel into the center of the chamber and keep it there, two of the rotary's biggest drawbacks go away. You won't loose efficiency by having unburnt fuel, because the combustion was quenched in the apex seal area. AND you'll have a cooler and quiter exhaust, since that unburnt fuel won't be there to burn in your exhaust pipe. The MegaSquirt has the ability to adjust the injector timing, but I haven't played with it yet.