Return-Path: Received: from relay02.roc.ny.frontiernet.net ([66.133.131.35] verified) by logan.com (CommuniGate Pro SMTP 4.1.3) with ESMTP id 2575907 for flyrotary@lancaironline.net; Thu, 11 Sep 2003 09:58:10 -0400 Received: (qmail 31863 invoked from network); 11 Sep 2003 13:58:09 -0000 Received: from unknown (HELO frontiernet.net) ([65.73.142.80]) (envelope-sender ) by relay02.roc.ny.frontiernet.net (FrontierMTA 2.3.6) with SMTP for ; 11 Sep 2003 13:58:09 -0000 Message-ID: <3F6071CF.43295AB8@frontiernet.net> Date: Thu, 11 Sep 2003 08:59:59 -0400 From: Jim Sower X-Mailer: Mozilla 4.77 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: turbo wastegate requirements References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Yeah. I've been off the list for about 9 months and missed your posts. Before I left, I wasn't that interested in turbocharging. While I was "on sabbatical" the notion developed that a turbocharger is the most effective muffler available for a rotary - with the collateral benefit of boost :o) I would simplify (the mechanical aspects) by using independent levers for throttle and wastegate, but aside from that I am right there with you. Rusty tells us that there is -some- boost is there even with the wastegate wide open but that is manageable. The arrangement of using boost last - after WOT is reached - will minimize intercooling requirements. I like your pop-off valve that goes at an absolute MAP and not some over pressure. We seem to be on the same page .... Jim S. Marvin Kaye wrote: > Jim Sower wrote: > > >>>I would have a manual internal waste gate. The waste gate would > be normally open (dumping all exhaust past the turbo). On > takeoff, I would run WOT (say 29"), no boost. I could close the > waste gate a little and get 33" for example for a hot day or > short field. As I climb out at WOT, I gradually close the waste > gate to maintain 30" MAP. ......<<< > > I have outlined essentially this same system here several times during the > last few years, as it is the simplest and probably the least complicated way > (read less plumbing and parts) to get the job done. My intention is to setup > the throttle lever so 50% travel gives me WOT at the throttle body. As I > further advance the throttle lever the wastegate begins to close and brings > the turbo online. With the throttle lever wide open the wastegate will be > fully closed. The popoff on the intake manifold is referenced to MAP and not > boost, and set to blow off at my intended 34" MAP redline... this way the > overboost protection is unaffected by ambient pressure. Just thought I'd > share this once again as it's a hot topic revisited. > > > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html -- Jim Sower Crossville, TN; Chapter 5 Long-EZ N83RT, Velocity N4095T