X-Virus-Scanned: clean according to Sophos on Logan.com From: "Tom Mann" Received: from mail.infosaic.com ([216.226.148.38] verified) by logan.com (CommuniGate Pro SMTP 6.1.14) with ESMTPS id 9387261 for flyrotary@lancaironline.net; Fri, 20 Jan 2017 08:52:35 -0500 Received-SPF: none receiver=logan.com; client-ip=216.226.148.38; envelope-from=tmann@n200lz.com Received: from DSS04 (ip98-161-33-63.om.om.cox.net [98.161.33.63]) by mail.infosaic.com with SMTP (version=Tls12 cipher=Aes128 bits=128); Fri, 20 Jan 2017 08:55:33 -0500 Message-ID: <1A28D811192544FCBF313ACD5BF610FF@DSS04> Reply-To: "Tom Mann" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] IVO prop slip-ring improvements Date: Fri, 20 Jan 2017 07:51:45 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_300F_01D272F2.0C383CF0" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 16.4.3528.331 X-MimeOLE: Produced By Microsoft MimeOLE V16.4.3528.331 This is a multi-part message in MIME format. ------=_NextPart_000_300F_01D272F2.0C383CF0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Nice mod!=20 I like it!!! T Mann From: Todd Bartrim=20 Sent: Thursday, January 19, 2017 6:47 PM To: Rotary motors in aircraft=20 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.=20 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 ------=_NextPart_000_300F_01D272F2.0C383CF0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable
Nice mod!
I like it!!!
 
T Mann
 
From: Todd Bartrim
Sent: Thursday, January 19, 2017 6:47 PM
Subject: [FlyRotary] IVO prop slip-ring=20 improvements
 
  I wasn't going to post anything about this until I'd run it = and had=20 a proper test, but since you're all be so quiet... IVO props always get = some=20 people talking good or bad. Personally I feel they are good bang for the = buck,=20 but they do have some shortcomings. One that always bugged me, no = actually I=20 hated it, was the slip ring arrangement. I wish I had some current pics = of the=20 original set-up, but those that are interested in this will probably = already=20 know it well. It prevented use of the rear spinner bulkhead, or required = using=20 IVO's goofy little spinner. I wanted to move the slip-rings to a mount = on the=20 backside of the rear spinner bulkhead. The pics at the link below, show = what I=20 did.
 
https://goo.gl/photos/oV= 3uphNoCapBwPpE6
 
The first pic was just a proof-of-concept that I made on my wood = lathe.=20 Next I made it out of a piece of micarta (electrical insulating board) = which I=20 cut some grooves into then had some brass rings machined to fit. I = drilled and=20 tapped a shallow screw hole into the back of each ring and have a brass = stud=20 insulated as it passes through the bulkhead. I also took apart the drive = motor=20 and replaced the lead wires with longer ones rather than just splicing = and=20 extension as due to centrifugal force, I didn't want even the extra = weight of a=20 splice on those wires as well as the stress points of a splice. I also = didn't=20 care for the IVO brushes and holder design, so I found that the = replacement=20 brushes for a Honda generator are far more robust as well as cheap and=20 plentiful, I bought 5 for $5. So I redesigned this mount as well.
   As undoubtedly there will be some sharp eyes out there = and=20 will question this, the ring of rivets that hold the micarta to the = bulkhead=20 have several evenly spaced rivets that are inset closer to the outer = slip ring.=20 This was due to the original set of holes that I used when I first = mounted the=20 ring, but before I determined the required ring diameters. Also one = rivet is=20 missing as this is the location where the magnet is mounted for the prop = speed=20 sensor.
 
Todd Bartrim
 
C-FSTB
RV9 = 13Bturbo
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