X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-04.southeast.rr.com ([24.25.9.103] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1180284 for flyrotary@lancaironline.net; Fri, 16 Jun 2006 08:25:08 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-111-186.carolina.res.rr.com [24.74.111.186]) by ms-smtp-04.southeast.rr.com (8.13.6/8.13.6) with SMTP id k5GCOLTH021048 for ; Fri, 16 Jun 2006 08:24:22 -0400 (EDT) Message-ID: <000901c6913f$ecd61ca0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Engine rpm was [FlyRotary] Life without a turbo.... Date: Fri, 16 Jun 2006 08:25:16 -0400 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2869 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 X-Virus-Scanned: Symantec AntiVirus Scan Engine ----- Original Message ----- From: "Bulent Aliev" To: "Rotary motors in aircraft" Sent: Thursday, June 15, 2006 10:14 PM Subject: [FlyRotary] Life without a turbo.... > After working for a week on all the details I did tonight my first run in > NA mode. > Prop is 3 blade IVO Magnum 68" electric set for take off (fine pitch) > OAT 90F > Right off the box without any tuning made 4900 static (2260 prop) > I'm pleased, since the prop was ordered for my turbo setup. My turbo/ > muffler does a very good job. The noise was very close to the one I had > with the turbo. I basically gutted the turbo and left only the empty hot > section on. Makes very compact and sturdy muffler, with exhaust pointed > exactly where I want it without modifications. > John Slade tells me this static RPM is sufficient for flight. I wander > what other people think? I can trim the prop also and get a bit higher > RPM. John is running 64" (same prop) with his turbo application. > Buly > Buly Buly, I have no experience with an IVO, but I do want to remind you that maximum static rpm does not NECESSARILY mean you are getting adequate thrust. I recall one individual who concluded that maximum engine rpm = max thrust. He reduce the pitch until he had maximum rpm, unfortunately the thrust was just enough to get him airborne, but not enough to accelerate to a safe speed. He never gained altitude and impacted a cactus with fatal results. If your prop is set up similar to John's then you have a comparison and assuming your bird is similar in weight, etc, then is probably Ok to fly. I'd do a few taxi test and if your acceleration feels strong then you are probably generating good thrust. Any other "prop" guys want to advise Buly. Ed Ed