X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtp111.sbc.mail.re2.yahoo.com ([68.142.229.94] verified) by logan.com (CommuniGate Pro SMTP 5.1c.2) with SMTP id 1222676 for flyrotary@lancaironline.net; Mon, 03 Jul 2006 20:38:47 -0400 Received-SPF: none receiver=logan.com; client-ip=68.142.229.94; envelope-from=sladerj@sbcglobal.net Received: (qmail 28008 invoked from network); 4 Jul 2006 00:38:03 -0000 Received: from unknown (HELO ?192.168.1.65?) (taskswap@sbcglobal.net@75.21.24.135 with plain) by smtp111.sbc.mail.re2.yahoo.com with SMTP; 4 Jul 2006 00:38:03 -0000 Message-ID: <44A9B869.5070805@sbcglobal.net> Date: Mon, 03 Jul 2006 20:38:01 -0400 From: John Slade Reply-To: sladerj@sbcglobal.net User-Agent: Thunderbird 1.5.0.4 (Windows/20060516) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] IvoProp Brushholder Mounting Question References: In-Reply-To: Content-Type: multipart/mixed; boundary="------------010808040505020607050309" This is a multi-part message in MIME format. --------------010808040505020607050309 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Dave, Buly's looks like a fine solution. I used 1/8 steel plate cut in a horseshoe and bolted under 4 or 5 of the small bolts on the end of the redrive. (I checked with Tracy to be sure this is ok). The brushes are mounted at the end of a short threaded rod. This way there's not as much length for vibration. Less moving parts. :) I don't have a picture, but here's a drawing. One thought to keep in mind. A Hershey kiss spinner looks good, covers the motor and is supposed to help significantly with drag & cooling. The spinner mount plate MUST be AL, not fiberglass, and goes forward of the forward knurled pressure plate. Removing the spinner to check torque can be a pain, so you might want to leave it off until the torque settles - 5 - 10 hours. Here's the main point - the hershey kiss spinner is usually fitted with a flow-guide that helps the air out of the cowl. Getting the brush mount UNDER the flow guide is going to be a challenge, but is probably worth doing. If you can engineer this please make one for me. :) Regards, John 77.1 hours and still hmmmin David Staten wrote: > I am posting this to both groups.. rotary and Canard.. in hopes of > getting some good ideas.. > > I will be mounting a Ivo Magnum on the back of a rotary powered > velocity.. I've heard the horror stories with the horizontally opposed > engines and IVO's but will give it a shot on a smoother running > engine.. The inflight adjustable propellors have a reversible motor > in the hub, and its power is provided to the prop by a graphite two > conductor brush assembly in a plastic housing. > > What I am having difficulty in doing is devising a sturdy enough brush > mounting arrangement. 1st arrangement (meant for ground use ONLY > consists of some home depot aluminum angle, threaded rod and a few > nuts and locknuts.. I tried building a 2nd arrangement tonight out of > 26 ga galvanized sheet steel with stiffeners built into two opposing > layers (back to back). In the absense of workable feedback, 3rd > arrangement will be out of 16 ga sheet steel.. to try and develop > rigidity, and will have it form an L or J channel with a horseshoe > cutout on the long side to straddle the propshaft and engage as many > bolts on the PRSU bearing retainer hub as possible. Currently all my > mounting schemes involve the bearing retainer ring mounting bolts on > my redrive. > > I have a RD-1B redrive from real world solutions as the most likely > anchoring point.. just want to get ideas (and pictures) from those who > have actually made this work. > > Dave > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ > --------------010808040505020607050309 Content-Type: image/jpeg; name="brushes.jpg" Content-Transfer-Encoding: base64 Content-Disposition: inline; filename="brushes.jpg" /9j/4AAQSkZJRgABAQEBLAEsAAD/2wBDAAUDBAQEAwUEBAQFBQUGBwwIBwcHBw8LCwkMEQ8S EhEPERETFhwXExQaFRERGCEYGh0dHx8fExciJCIeJBweHx7/2wBDAQUFBQcGBw4ICA4eFBEU Hh4eHh4eHh4eHh4eHh4eHh4eHh4eHh4eHh4eHh4eHh4eHh4eHh4eHh4eHh4eHh4eHh7/wAAR CACrAOQDASIAAhEBAxEB/8QAHwAAAQUBAQEBAQEAAAAAAAAAAAECAwQFBgcICQoL/8QAtRAA AgEDAwIEAwUFBAQAAAF9AQIDAAQRBRIhMUEGE1FhByJxFDKBkaEII0KxwRVS0fAkM2JyggkK 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