Return-Path: <13brv3@bellsouth.net> Received: from imf20aec.mail.bellsouth.net ([205.152.59.68] verified) by logan.com (CommuniGate Pro SMTP 4.2b4) with ESMTP id 120343 for flyrotary@lancaironline.net; Wed, 02 Jun 2004 08:50:12 -0400 Received: from rad ([65.6.194.9]) by imf20aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040602124942.VARC18130.imf20aec.mail.bellsouth.net@rad> for ; Wed, 2 Jun 2004 08:49:42 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: 3rd flight Date: Wed, 2 Jun 2004 07:47:39 -0500 Message-ID: <01aa01c4489f$ca143b60$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01AB_01C44875.E13E3360" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_01AB_01C44875.E13E3360 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Steve, one possibility is that the Ivo prop's root section is creating = back pressure in flight. Years ago some canard flyers did testing in flight = and found there was reverse flow around the hub area. Ivo prop's first 1/3section from the hub has very little pitch, and the faster you go, it acts more like flat disk. Bulent =20 =20 Steve, =20 I agree that you should have enough exit area. Bulent may be onto = something with the prop theory. In tractor type planes, the IVO is believed to = create a lot of drag around the hub, which keeps the top speed down. I always figured that canards were immune to this, since the fuselage blocked the draggy area of the hub. Now that I think about it, I believe Tracy mentioned that it had an adverse effect on his cooling flow as well, = and his inlet, is your outlet. =20 =20 If this continues to be a problem, can you borrow a prop from someone = else as a test? This will be much easier for people using the -C box, since = it will be the same as a Lycoming. I guess a -B canard can exchange with a tractor Lycoming. Man, starting to get dizzy thinking of this :-) =20 Good luck, Rusty =20 ------=_NextPart_000_01AB_01C44875.E13E3360 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Steve, one = possibility is=20 that the Ivo prop’s root section is creating back pressure in = flight. Years ago=20 some canard flyers did testing in flight and found there was reverse = flow around=20 the hub area. Ivo prop’s first 1/3section from the hub has very = little pitch,=20 and the faster you go, it acts more like flat=20 disk.
Bulent  
 
Steve,
 
I agree=20 that you should have enough exit area.  Bulent may be onto=20 something with the prop theory.  In tractor type planes, = the IVO=20 is believed to create a lot of drag around the hub, which keeps the = top=20 speed down.  I always figured that canards were immune to this, = since the=20 fuselage blocked the draggy area of the hub.  Now that I think = about it, I=20 believe Tracy mentioned that it had an adverse effect on his = cooling=20 flow as well,  and his inlet, is your=20 outlet.  
 
If this=20 continues to be a problem, can you borrow a prop from someone else = as a=20 test?  This will be much easier for people using the -C = box,=20 since it will be the same as a Lycoming.  I guess a -B canard can = exchange=20 with a tractor Lycoming.  Man, starting to get dizzy thinking = of this=20 :-)
 
Good=20 luck,
Rusty
   
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