X-Virus-Scanned: clean according to Sophos on Logan.com From: Received: from resqmta-ch2-07v.sys.comcast.net ([69.252.207.39] verified) by logan.com (CommuniGate Pro SMTP 6.1.14) with ESMTPS id 9386318 for flyrotary@lancaironline.net; Thu, 19 Jan 2017 22:23:28 -0500 Received-SPF: pass receiver=logan.com; client-ip=69.252.207.39; envelope-from=hoursaway1@comcast.net Received: from resomta-ch2-09v.sys.comcast.net ([69.252.207.105]) by resqmta-ch2-07v.sys.comcast.net with SMTP id UPnCc0Ctrj8tqUPnCcWC1z; Fri, 20 Jan 2017 03:23:10 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20161114; t=1484882590; bh=mjF0nwo7R3FQp80aF1CA7jbpvrMc+qDligwKb290l5Y=; h=Received:Received:Date:From:To:Message-ID:Subject:MIME-Version: Content-Type; b=nHOsE8FgN7MDjBjgC2cHOM/jLLLmHhvMl40x3OKbbO9Q6uN26G7/buqu6HewCgrrE AtfqIupZYj/AKHdASBAAqdZhoS3Pwn2obwOP3q4E4sjF6l+sO3SW3kSEhC75P4X440 QT3KgZQtj7EK0nie++9A0ApEMT0G/LWH6/p4ws3eXp8oY+Vj1l71zDtjXOO3W9CnPW 3vDB60wX5R5UbddKFc9yr3rWB3R3ln7DgM8l+kSt3Aek1XjoArW6/WEDRfO5spN1fr jGhRyy3whioeSb7NCbJz2Kh5eI9dQ3SRagMv6xG2WPohcl2nPV69M9fM7j92wUnYQp qogETEqm3LfWg== Received: from resmail-ch2-632v.sys.comcast.net ([162.150.50.156]) by resomta-ch2-09v.sys.comcast.net with SMTP id UPnCc0W2bxFqGUPnCcVGSB; Fri, 20 Jan 2017 03:23:10 +0000 Date: Fri, 20 Jan 2017 03:23:10 +0000 (UTC) To: "Fly rotary blog, e-mail" Message-ID: <2077857046.98237824.1484882590446.JavaMail.zimbra@comcast.net> In-Reply-To: References: Subject: Re: [FlyRotary] IVO prop slip-ring improvements MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_98237823_866042395.1484882590442" X-Originating-IP: [::ffff:68.49.229.174] X-Mailer: Zimbra 8.0.7_GA_6031 (ZimbraWebClient - GC51 (Win)/8.0.7_GA_6031) Thread-Topic: IVO prop slip-ring improvements Thread-Index: oGukQatoJ7BCyJEr/3vQwH0JLraKIw== X-CMAE-Envelope: MS4wfEmvDjYZOnzN+R+bPIaKSgKlMOIgYbrGZvacmBysCck3eCrEVtrc0ePGZ1tXbrgzcM6x497y06NHcamAf92eEemfkpOGdHTaw/xS6k9TZL9fd0zVwMvP j2c7O5VNLCcuXdXALyh6OkGr3JzSy5zw706Lfhbg1iYro3lbxCg+08Fh2KEDd//NYUWX2MOwyPgImVZqUjNIESEK+wY/dGDX+Lw= ------=_Part_98237823_866042395.1484882590442 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Todd, I fabbed a setup similar to that very simple, only have about 70 hours total on it so far but looking/holding up ok. send me your email address & I'll email photos. hoursaway1@comcast.net David R. Cook RV6A Rotary Lansing MI. ----- Original Message ----- From: "Todd Bartrim" To: "Rotary motors in aircraft" Sent: Thursday, January 19, 2017 7:47:20 PM Subject: [FlyRotary] IVO prop slip-ring improvements I wasn't going to post anything about this until I'd run it and had a proper test, but since you're all be so quiet... IVO props always get some people talking good or bad. Personally I feel they are good bang for the buck, but they do have some shortcomings. One that always bugged me, no actually I hated it, was the slip ring arrangement. I wish I had some current pics of the original set-up, but those that are interested in this will probably already know it well. It prevented use of the rear spinner bulkhead, or required using IVO's goofy little spinner. I wanted to move the slip-rings to a mount on the backside of the rear spinner bulkhead. The pics at the link below, show what I did. https://goo.gl/photos/oV3uphNoCapBwPpE6 The first pic was just a proof-of-concept that I made on my wood lathe. Next I made it out of a piece of micarta (electrical insulating board) which I cut some grooves into then had some brass rings machined to fit. I drilled and tapped a shallow screw hole into the back of each ring and have a brass stud insulated as it passes through the bulkhead. I also took apart the drive motor and replaced the lead wires with longer ones rather than just splicing and extension as due to centrifugal force, I didn't want even the extra weight of a splice on those wires as well as the stress points of a splice. I also didn't care for the IVO brushes and holder design, so I found that the replacement brushes for a Honda generator are far more robust as well as cheap and plentiful, I bought 5 for $5. So I redesigned this mount as well. As undoubtedly there will be some sharp eyes out there and will question this, the ring of rivets that hold the micarta to the bulkhead have several evenly spaced rivets that are inset closer to the outer slip ring. This was due to the original set of holes that I used when I first mounted the ring, but before I determined the required ring diameters. Also one rivet is missing as this is the location where the magnet is mounted for the prop speed sensor. Todd Bartrim C-FSTB RV9 13Bturbo ------=_Part_98237823_866042395.1484882590442 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Todd, I fabbed a setup similar to that= very simple, only have about 70 hours total on it so far but looking/holdi= ng up ok. send me your email address & I'll email photos.  hoursaway1@comcast.net David R. Cook=   RV6A Rotary Lansing MI.

From: <= /b>"Todd Bartrim" <flyrotary@lancaironline.net>
To: "Rotary= motors in aircraft" <flyrotary@lancaironline.net>
Sent: Th= ursday, January 19, 2017 7:47:20 PM
Subject: [FlyRotary] IVO prop= slip-ring improvements

  I wa= sn't going to post anything about this until I'd run it and had a proper te= st, but since you're all be so quiet... IVO props always get some people ta= lking good or bad. Personally I feel they are good bang for the buck, but t= hey do have some shortcomings. One that always bugged me, no actually I hat= ed it, was the slip ring arrangement. I wish I had some current pics of the= original set-up, but those that are interested in this will probably alrea= dy know it well. It prevented use of the rear spinner bulkhead, or required= using IVO's goofy little spinner. I wanted to move the slip-rings to a mou= nt on the backside of the rear spinner bulkhead. The pics at the link below= , show what I did.


The first pic was just a proof-of-concept that I made on my= wood lathe. Next I made it out of a piece of micarta (electrical insulatin= g board) which I cut some grooves into then had some brass rings machined t= o fit. I drilled and tapped a shallow screw hole into the back of each ring= and have a brass stud insulated as it passes through the bulkhead. I also = took apart the drive motor and replaced the lead wires with longer ones rat= her than just splicing and extension as due to centrifugal force, I didn't = want even the extra weight of a splice on those wires as well as the stress= points of a splice. I also didn't care for the IVO brushes and holder desi= gn, so I found that the replacement brushes for a Honda generator are far m= ore robust as well as cheap and plentiful, I bought 5 for $5. So I redesign= ed this mount as well. 
   As undoubtedly there wi= ll be some sharp eyes out there and will question this, the ring of rivets = that hold the micarta to the bulkhead have several evenly spaced rivets tha= t are inset closer to the outer slip ring. This was due to the original set= of holes that I used when I first mounted the ring, but before I determine= d the required ring diameters. Also one rivet is missing as this is the loc= ation where the magnet is mounted for the prop speed sensor.

Todd Bartrim<= /div>

C-FSTB
RV9 13Bturbo

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