X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: flyrotary Date: Sun, 24 Apr 2005 17:54:23 -0400 Message-ID: X-Virus-Scanned: clean according to Sophos on Logan.com X-PolluStop-Diagnostic: X-PolluStop-Score: 0.00 X-PolluStop: Scanned with Niversoft PolluStop 2.1 RC3, http://www.niversoft.com/pollustop X-Original-Return-Path: Received: from sccrmhc13.comcast.net ([204.127.202.64] verified) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 912292 for flyrotary-request@lancaironline.net; Sat, 23 Apr 2005 13:57:55 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.202.64; envelope-from=rv-7a@comcast.net Received: from HP1706 (pcp09769723pcs.albqrq01.nm.comcast.net[69.240.77.235]) by comcast.net (sccrmhc13) with SMTP id <2005042317571001600agthge>; Sat, 23 Apr 2005 17:57:11 +0000 X-Original-Message-ID: <001101c5482d$df117a80$6401a8c0@HP1706> From: "rv-7a" X-Original-To: Subject: Upper Airspeed Data on Rotary-Powered Van's RV X-Original-Date: Sat, 23 Apr 2005 11:56:29 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000E_01C547FB.7C31D090" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_000E_01C547FB.7C31D090 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I've been lurking the flyrotary list on occasion for the last year. I = plan to hang a Renesis w/Tracy's RD-1C on my under construction RV-7A.=20 =20 My questions:=20 1) Has anyone flown an RV with a super or turbo charged = rotary/RD-1C combination? If yes, I'd like to know how much flight data = is available - specifically upper airspeed under what flight and = aircraft conditions (fairings on? prop diameter/pitch/model/type? RV = model? ...). 2) For anyone flying a normally aspirated rotary with the RD-1C on = a Van's RV. If you've tested the upper airspeed of your aircraft in = cruise flight would you be willing to share your data with me?=20 Background: The reason for this inquiry is that I naively planned to supercharge the = Renesis installation because I thought the airframe could SAFELY cruise = up to 200 KTS IAS (RV-7 Vne) in smooth air. At my typical NM altitude = (12,500 MSL), that would be 248 KTS TAS (285 MPH)! =20 =20 However, my bubble was busted by the Van's RVAtor article on flutter = (6th issue 2004). Van's engineers instructed their readership on flutter = - that Vne is really a TAS limit, not an IAS limit. A US Air Force pilot = and RV commuter corroborated the Van's article by telling his disturbing = TAS flutter story (first 2005 RVAtor issue). If you haven't read this, I = recommend it for all pilots, no matter what they fly. =20 I've decided to follow Van's advice and restrict my upper airspeed to = limit to 200 KTS TAS in smooth air. I don't want to be a test pilot. = Therefore, I'm reconsidering my plan to supercharge the Renesis/RD-1C = installation. The weight penalty may not be worth climb performance = increase if 200 KTS TAS cruise can be easily achieved with a normally = aspirated installation. If I can collect empirical data from RV Rotary = flyers, it would sure help my decision. =20 Thanks, John Burns rv-7a@comcast.net http://mywebpages.comcast.net/jgburns/Engine/Engine.html for my engine = webpage. ------=_NextPart_000_000E_01C547FB.7C31D090 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I've been lurking the = flyrotary list=20 on occasion for the last year. I plan to hang a Renesis w/Tracy's RD-1C = on my=20 under construction RV-7A.

My=20 questions:

1) =20 Has = anyone flown=20 an RV with a super or turbo charged rotary/RD-1C combination? = If yes,=20 I'd like to know how much flight data is available - specifically = upper=20 airspeed under what flight and aircraft conditions (fairings on? prop=20 diameter/pitch/model/type? RV model? ...).

2) =20 For = anyone=20 flying a normally aspirated rotary with the RD-1C on a Van=92s RV. If = you=92ve=20 tested the upper airspeed of your aircraft in cruise flight would you be = willing=20 to share your data with me?

Background:

The reason for this = inquiry is=20 that I naively planned to supercharge the Renesis installation = because=20 I thought the airframe could SAFELY cruise up to 200 KTS IAS (RV-7 = Vne) in=20 smooth air. At my typical NM altitude (12,500 MSL), that would = be 248=20 KTS TAS (285 MPH)! =20

However, my bubble was = busted by the=20 Van's RVAtor article on flutter (6th issue 2004). Van=92s = engineers=20 instructed their readership on flutter =96 that Vne is really a TAS = limit, not an=20 IAS limit. A US Air Force pilot and RV commuter corroborated the Van=92s = article=20 by telling his disturbing TAS flutter story (first 2005 RVAtor issue). = If you=20 haven=92t read this, I recommend it for all pilots, no matter what they=20 fly.

I=92ve decided to follow = Van=92s advice=20 and restrict my upper airspeed to limit to 200 KTS TAS in smooth air. I = don=92t=20 want to be a test pilot. Therefore, I=92m reconsidering my plan to = supercharge the=20 Renesis/RD-1C installation. The weight penalty may not be = worth climb=20 performance increase if 200 KTS TAS cruise can be easily achieved=20 with a normally aspirated installation. If I can collect = empirical data=20 from RV Rotary flyers, it would sure help my = decision.

Thanks,

John = Burns

rv-7a@comcast.net

http://mywebpages.comcast.net/jgburns/Engine/Engine.html<= /A> for=20 my engine webpage.

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