X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Received: from [209.87.238.133] (HELO intldata.ca) by logan.com (CommuniGate Pro SMTP 5.1.3) with ESMTP id 1624317 for flyrotary@lancaironline.net; Thu, 30 Nov 2006 10:18:31 -0500 Received-SPF: none receiver=logan.com; client-ip=209.87.238.133; envelope-from=jwhaley@intldata.ca Received: from jwhaley ([209.87.238.175]) by intldata.ca (intldata.ca) (MDaemon.PRO.v8.1.3.R) with ESMTP id md50000367350.msg for ; Thu, 30 Nov 2006 10:17:23 -0500 From: "Jeff Whaley" To: "'Rotary motors in aircraft'" Subject: RE: Windmilling ... was EAA 782 meeting Date: Thu, 30 Nov 2006 10:17:23 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0036_01C71468.BA3B20E0" X-Mailer: Microsoft Office Outlook, Build 11.0.5510 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 Thread-Index: AccUHwtULYfCWoDCRJieccIva/zkhgAcnIvQ In-Reply-To: X-Spam-Processed: intldata.ca, Thu, 30 Nov 2006 10:17:23 -0500 (not processed: message from valid local sender) X-MDRemoteIP: 209.87.238.175 X-Return-Path: jwhaley@intldata.ca X-MDaemon-Deliver-To: flyrotary@lancaironline.net Reply-To: jwhaley@intldata.ca Message-ID: X-MDAV-Processed: intldata.ca, Thu, 30 Nov 2006 10:17:23 -0500 This is a multi-part message in MIME format. ------=_NextPart_000_0036_01C71468.BA3B20E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Thanks Rusty and Finn, glad to hear that they don't tend to windmill . I have the 2.85 drive. Can't say I understand why they don't, as the relative force to turn over the Rotary is significantly less than a Lycoming or any other auto conversion. The Lycoming won't windmill either, but they can be air-started in a dive. Jeff (hoping to never experience either) _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Russell Duffy Sent: Wednesday, November 29, 2006 8:29 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: EAA 782 meeting One concern I have is if the engine fails there is nothing in the design of any gear box and a Rotary engine to stop or reduce propeller wind milling. Has anyone experienced an engine out and have any testimonies as to what happens? Hi Jeff, I think it's pretty well established that there will be no windmilling at any reasonable speed. I can personally confirm that the 2.85 drive will not windmill up to 110-120 kts or so. I still have a perfectly clear mental image of the prop sitting at 10:00-4:00 position :-0 The 2.17 drive would be more likely, but I think it's been reported that it won't windmill either. If anything, that may be a plus for PSRU's. Cheers, Rusty (mentally working on the single rotor gyrocopter) 2.176:1 will definitely not windmill at pattern or glide speed for an RV-3 (about 100 mph). Might make a 1/3 turn and stop again if you point it down a bit. And that was with an engine that had rather low compression. Tested several times over Clearwater Airpark. Finn __________ NOD32 1892 (20061130) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com ------=_NextPart_000_0036_01C71468.BA3B20E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Thanks Rusty and Finn, glad to hear = that they don’t tend to windmill … I have the 2.85 = drive.

Can’t say I understand why = they don’t, as the relative force to turn over the Rotary is significantly less than = a Lycoming or any other auto conversion.

The Lycoming won’t windmill = either, but they can be air-started in a dive.

Jeff (hoping to never experience = either)

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Russell Duffy
Sent: Wednesday, November = 29, 2006 8:29 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = EAA 782 meeting

 

One concern I have is if the engine = fails there is nothing in the design of any gear box and a Rotary engine to = stop or reduce propeller wind milling.

Has anyone experienced an engine = out and have any testimonies as to what happens? 

=

 

Hi = Jeff,

 

I think it's pretty well established = that there will be no windmilling at any reasonable speed.  I can = personally confirm that the 2.85 drive will not windmill up to 110-120 kts or so.  I still have a perfectly clear mental image of the prop = sitting at 10:00-4:00 position :-0

 

The 2.17 drive would be more likely, = but I think it's been reported that it won't windmill either.  If anything, that may be a plus for PSRU's.

 

Cheers,

Rusty (mentally working on the = single rotor gyrocopter)  

 

=

2.176:1 will definitely not windmill at pattern or glide speed = for an RV-3 (about 100 mph). Might make a 1/3 turn and stop again if you point = it down a bit. And that was with an engine that had rather low compression.
Tested several times over Clearwater Airpark.

Finn

 

 

 

   



__________ NOD32 1892 (20061130) Information __________

This message was checked by NOD32 antivirus system.
http://www.eset.com

------=_NextPart_000_0036_01C71468.BA3B20E0--