X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 1 [X] Return-Path: Received: from [66.219.56.248] (HELO qnsi-xch.qnsi.net) by logan.com (CommuniGate Pro SMTP 5.1.3) with ESMTP id 1624355 for flyrotary@lancaironline.net; Thu, 30 Nov 2006 10:24:54 -0500 Received-SPF: none receiver=logan.com; client-ip=66.219.56.248; envelope-from=bhughes@qnsi.net X-MimeOLE: Produced By Microsoft Exchange V6.5.6944.0 Content-class: urn:content-classes:message Return-Receipt-To: "Bobby J. Hughes" MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C71493.98FF5CAE" Disposition-Notification-To: "Bobby J. Hughes" Subject: RE: [FlyRotary] Re: Windmilling ... was EAA 782 meeting Date: Thu, 30 Nov 2006 09:24:13 -0600 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: Windmilling ... was EAA 782 meeting Thread-Index: AccUktqFBcaV0crESiefhu/MrsMdxwAAF7bw From: "Bobby J. Hughes" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C71493.98FF5CAE Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable If the redrive shaft breaks in the air it would not be turning the rotors so it might be a different story. Or am I missing something? =20 Bobby ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Jeff Whaley Sent: Thursday, November 30, 2006 9:17 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Windmilling ... was EAA 782 meeting 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) =20 ________________________________ 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 =20 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?=20 =20 Hi Jeff, =20 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 =20 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. =20 Cheers, Rusty (mentally working on the single rotor gyrocopter) =20 =20 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 =20 =20 =20 =20 __________ NOD32 1892 (20061130) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com ------_=_NextPart_001_01C71493.98FF5CAE Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message=
If the redrive shaft breaks in the air it would = not be=20 turning the rotors so it might be a different story. Or am I missing=20 something?
 
Bobby

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of Jeff=20 Whaley
Sent: Thursday, November 30, 2006 9:17 AM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: Windmilling ... = was EAA=20 782 meeting

Thanks Rusty = and Finn,=20 glad to hear that they don’t tend to windmill … I have the = 2.85=20 drive.

Can’t = say I understand=20 why they don’t, as the relative force to turn over the Rotary is = significantly=20 less than a Lycoming or any other auto = conversion.

The Lycoming = won’t=20 windmill either, but they can be air-started in a=20 dive.

Jeff (hoping = to never=20 experience either)

 

From:=20 Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On=20 Behalf Of Russell Duffy
Sent: Wednesday, November 29, = 2006 8:29=20 PM
To: = Rotary motors in aircraft
Subject: [FlyRotary] Re: EAA 782=20 meeting

 

One concern I = have is=20 if the engine fails there is nothing in the design of any gear box and a = Rotary=20 engine to stop or reduce propeller wind = milling.

Has anyone = experienced=20 an engine out and have any testimonies as to what = happens? 

 

Hi=20 Jeff,

 

I think it's = pretty well=20 established that there will be no windmilling at any reasonable = speed.  I=20 can personally confirm that the 2.85 drive will not windmill up to = 110-120=20 kts or so.  I still have a perfectly clear mental image of the prop = sitting=20 at 10:00-4:00 position :-0

 

The 2.17 drive = would be=20 more likely, but I think it's been reported that it won't windmill=20 either.  If anything, that may be a plus for=20 PSRU's.

 

Cheers,

Rusty = (mentally working=20 on the single rotor = gyrocopter)  

 

2.176:1 will definitely not windmill at = pattern or glide=20 speed for an RV-3 (about 100 mph). Might make a 1/3 turn and stop again = if you=20 point it down a bit. And that was with an engine that had rather low=20 compression.
Tested several times over Clearwater=20 Airpark.

Finn

 

 

 

   



__________ NOD32 1892 (20061130) = Information=20 __________

This message was checked by NOD32 antivirus = system.
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