From: "Todd Bartrim" <flyrotary@lancaironline.net>
Received-SPF: pass
 receiver=logan.com; client-ip=209.85.213.182; envelope-from=bartrim@gmail.com
MIME-Version: 1.0
Date: Thu, 19 Jan 2017 16:47:20 -0800
Message-ID: <CALYfWBv-fvuqh9Ra779miipzBd20GtOGujtoXmvAu-on4G1yXw@mail.gmail.com>
Subject: IVO prop slip-ring improvements
To: FlyRotary <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=001a11c110fc0e6a8f05467bfe43

--001a11c110fc0e6a8f05467bfe43
Content-Type: text/plain; charset=UTF-8

  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

--001a11c110fc0e6a8f05467bfe43
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>=C2=A0 I wasn&#39;t going to post anything about this=
 until I&#39;d run it and had a proper test, but since you&#39;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 arran=
gement. I wish I had some current pics of the original set-up, but those th=
at are interested in this will probably already know it well. It prevented =
use of the rear spinner bulkhead, or required using IVO&#39;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.</div><d=
iv><br></div><div><a href=3D"https://goo.gl/photos/oV3uphNoCapBwPpE6">https=
://goo.gl/photos/oV3uphNoCapBwPpE6</a></div><div><br></div><div>The first p=
ic 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 g=
rooves 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 insu=
lated 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&#39;t want even the extra wei=
ght of a splice on those wires as well as the stress points of a splice. I =
also didn&#39;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 we=
ll.=C2=A0</div><div>=C2=A0 =C2=A0As undoubtedly there will be some sharp ey=
es out there and will question this, the ring of rivets that hold the micar=
ta 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 us=
ed 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 mag=
net is mounted for the prop speed sensor.</div><br clear=3D"all"><div><div =
class=3D"gmail_signature"><div dir=3D"ltr">Todd Bartrim</div><div dir=3D"lt=
r"><br></div><div>C-FSTB</div><div>RV9 13Bturbo</div></div></div>
</div>

--001a11c110fc0e6a8f05467bfe43--