X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-qy0-f134.google.com ([209.85.221.134] verified) by logan.com (CommuniGate Pro SMTP 5.2.13) with ESMTP id 3543748 for flyrotary@lancaironline.net; Wed, 11 Mar 2009 11:49:06 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.221.134; envelope-from=rwstracy@gmail.com Received: by qyk40 with SMTP id 40so120319qyk.7 for ; Wed, 11 Mar 2009 08:48:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:sender:received:in-reply-to :references:date:x-google-sender-auth:message-id:subject:from:to :content-type; bh=aLM10ioPLGUZ9Lksslzs6CKf/lX94i7DdyyPI12yGIk=; b=UjkgAFQO0yTHenkwEsVRSWWV6+VrndKvc5tgho899K/Tggc+FF/yeXkWGARtUo1EAs BqH4g5asIAqP0Sgg6J2jwtiJS93nlI9F9PLq3NIconBlr5RGnrLkhTYq4VhqWt0t9+0p Amf3sMhGxk5RYI6+ORWR54oFT2QrxV+IXI2Mw= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:content-type; b=aR1HaWrj48JQFe+fg7Yro4klIHEEAxOdPUYCghb0DJCTojBxukBVLUpizbKBDehvPQ Th87zZQXDT00wom/a6nr/+VNXBzbzXfbRrZUD6btwzBwEx2nGJ7HHKq8KU2mUPlBcpLW xzQrKlph7BAs7vqOBH+EpDppNC2RZ+ZwQ8ePU= MIME-Version: 1.0 Sender: rwstracy@gmail.com Received: by 10.224.29.12 with SMTP id o12mr2834822qac.95.1236786487184; Wed, 11 Mar 2009 08:48:07 -0700 (PDT) In-Reply-To: References: Date: Wed, 11 Mar 2009 11:48:07 -0400 X-Google-Sender-Auth: 486607639132a417 Message-ID: <1b4b137c0903110848k54b6ee64i5dad5340546bdcd7@mail.gmail.com> Subject: Re: [FlyRotary] IVO Prop From: Tracy Crook To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0015175cde423b4edd0464d9cb9f --0015175cde423b4edd0464d9cb9f Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Yep, should have thought about pushers when I wrote that comment. The IVO seems to work well on pushers since the stalled inner part of the blades is in turbulent air and doesn't cost them the drag that it does on tractors. Tractors are pretty much stuck with high priced variable pitch stuff like MT to equal the performance of a *well matched* fixed pitch prop. What is well matched? If you are running an RD-1B the static rpm should be 5100 - 5500. With the RD-1C it should be 5900 - 6300 rpm. If you get less than that, it isn't a well matched prop. This also assumes that the engine is performing up to par of course. The exact number depends on what you want to optomize, climb performance or cruise economy. One more caveat: If you are putting it on a plane with a cruise speed below ~ 150 MPH, the IVO also works on tractors as well. On my RV-4 the IVO cut top speed about 15 mph. and around 10 mph from cruise compared to a well matched fixed pitch prop. Tracy On Wed, Mar 11, 2009 at 12:41 AM, John Slade wrote: > >I didn't know anyone had ever had any success with an IVO. Tell me more. > What do you want to know? Its a very well engineered piece of equipment. > The CF blades are hollow and have a steel rod running to the hub. Activating > the motor via brushes twists the steel and thus twists the blades equally. > The twist change is quite visible. There were problems with the individual > blades slipping on the hub. This has been solved by providing a knurled hub, > and not selling to guys with Lycomings. The IVO is available for rotary, > subaru, Franklin 6 and other less "pulsy" engines. After the first 15 hours > or so my blades have hardly taken any extra torque. > > My performance is greatly enhanced compared to the fixed pitch Performance > prop. Static with the wood prop was around 4500. With the IVO on full fine I > get closer to 5400 which gives me access to a lot more power on take off. > I've never done a "high speed" run with the IVO, but I've had 180 kts > indicated at 2000' a few times without much effort, and without ever going > to the full course setting. Another nice bonus is that throttled back on > full fine for landing, the prop acts like a brake. Its much easier to land > and stop than the fixed pitch that's pushing you along fairly well, even at > idle. > > I know a Velocity driver (Mike Watson) who also uses an IVO (Franklin 6) > and is very happy with it after around 5 years of use. > > The factory people are very easy to deal with and very helpful. > > The Cozy Girrrls are installing an IVO. What better recommendation could > you want? :) > > Regards, > John Slade > Turbo Rotary Cozy IV, N96PM > 98.1 Hrs. > > Mike Wills wrote: > >> >> >> Mike Wills >> RV-4 N144MW >> >> ----- Original Message ----- From: "John Slade" >> To: "Rotary motors in aircraft" >> Sent: Tuesday, March 10, 2009 10:30 AM >> Subject: [FlyRotary] Re: Ground Testing >> >> >> The IVO electric in-flight adjustable costs around $2350. I'm very >>> pleased with mine. My "spare" is a $2700 fixed pitch wood prop thats a piece >>> of art, but doesn't work anywhere near as well. >>> John >>> >>> Tracy Crook wrote: >>> A variable pitch prop would be nice to get the best of both worlds but >>> it's an expensive option and $10,000 buys a lot of gas. >>> >>> >>> >>> -- >>> Homepage: http://www.flyrotary.com/ >>> Archive and UnSub: >>> http://mail.lancaironline.net:81/lists/flyrotary/List.html >>> >>> >> >> >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: >> http://mail.lancaironline.net:81/lists/flyrotary/List.html >> >> > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > --0015175cde423b4edd0464d9cb9f Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Yep, should have thought about pushers when I wrote that comment.=A0 The IV= O seems to work well on pushers since the stalled inner part of the blades = is in turbulent air and doesn't cost them the drag that it does on trac= tors.=A0 Tractors are pretty much stuck with high priced variable pitch stu= ff like MT to equal the performance of a well matched fixed pitch pr= op.

What is well matched? =A0=A0 If you are running an RD-1B the static rpm= should be 5100 - 5500.=A0=A0 With the RD-1C it should be 5900 - 6300 rpm.= =A0=A0=A0 If you get less than that, it isn't a well matched prop.=A0 T= his also assumes that the engine is performing up to par of course. The exa= ct number depends on what you want to optomize, climb performance or cruise= economy.

One more caveat:=A0 If you are putting it on a plane with a cruise spee= d below ~ 150 MPH, the IVO also works on tractors as well.=A0 On my RV-4 th= e IVO cut top speed about 15 mph. and around 10 mph from cruise compared to= a well matched fixed pitch prop.

Tracy


On Wed, Mar 11, 2009 at 12:= 41 AM, John Slade <sladerj@sbcglobal.net> wrote:
>I didn't know anyone had ever had any success with an IVO. Tell me = more.
What do you want to know? Its a very well engineered piece of equipment. Th= e CF blades are hollow and have a steel rod running to the hub. Activating = the motor via brushes twists the steel and thus twists the blades equally. = The twist change is quite visible. There were problems with the individual = blades slipping on the hub. This has been solved by providing a knurled hub= , and not selling to guys with Lycomings. The IVO is available for rotary, = subaru, Franklin 6 and other less "pulsy" engines. After the firs= t 15 hours or so my blades have hardly taken any extra torque.

My performance is greatly enhanced compared to the fixed pitch Performance = prop. Static with the wood prop was around 4500. With the IVO on full fine = I get closer to 5400 which gives me access to a lot more power on take off.= I've never done a "high speed" run with the IVO, but I'v= e had 180 kts indicated at 2000' a few times without much effort, and w= ithout ever going to the full course setting. Another nice bonus is that th= rottled back on full fine for landing, the prop acts like a brake. Its much= easier to land and stop than the fixed pitch that's pushing you along = fairly well, even at idle.

I know a Velocity driver (Mike Watson) who also uses an IVO (Franklin 6) an= d is very happy with it after around 5 years of use.

The factory people are very easy to deal with and very helpful.

The Cozy Girrrls are installing an IVO. What better recommendation could yo= u want? :)

Regards,
John Slade
Turbo Rotary Cozy IV, N96PM
98.1 Hrs.

Mike Wills wrote:


Mike Wills
RV-4 N144MW

----- Original Message ----- From: "John Slade" <sladerj@sbcglobal.net>=
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, March 10, 2009 10:30 AM
Subject: [FlyRotary] Re: Ground Testing


The IVO electric in-flight adjustable costs around $2350. I'm very plea= sed with mine. My "spare" is a $2700 fixed pitch wood prop thats = a piece of art, but doesn't work anywhere near as well.
John

Tracy Crook wrote:
A variable pitch prop would be nice to get the best of both worlds but it&#= 39;s an expensive option and $10,000 buys a lot of gas.



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