X-Virus-Scanned: clean according to Sophos on Logan.com
Return-Path: <rusty@radrotary.com>
Received: from fmailhost01.isp.att.net ([207.115.11.51] verified)
by logan.com (CommuniGate Pro SMTP 5.2c1)
with ESMTP id 2551262 for flyrotary@lancaironline.net; Sat, 01 Dec 2007 18:31:50 -0500
Received-SPF: none
receiver=logan.com; client-ip=207.115.11.51; envelope-from=rusty@radrotary.com
Received: from rad (adsl-065-006-194-009.sip.pns.bellsouth.net[65.6.194.9])
by isp.att.net (frfwmhc01) with SMTP
id <20071201233112H0100n1tr0e>; Sat, 1 Dec 2007 23:31:12 +0000
X-Originating-IP: [65.6.194.9]
From: "Russell Duffy" <rusty@radrotary.com>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: Giving up on single rotor
Date: Sat, 1 Dec 2007 17:31:12 -0600
Message-ID: <000001c83472$42d1f030$6c01a8c0@rad>
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_NextPart_000_0001_01C8343F.F8378030"
X-Priority: 3 (Normal)
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook, Build 10.0.6822
Importance: Normal
Thread-Index: Acg0X3bQTrPB/B+sRTS4IbUHjAZ74wAD82RA
In-Reply-To: <list-2551160@logan.com>
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198
This is a multi-part message in MIME format.
------=_NextPart_000_0001_01C8343F.F8378030
Content-Type: text/plain;
charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
What was the latest problem with the single development, was it the
torsional reversals. The last I heard was you were going softer with the
damper material - did that work out?=20
=20
Hi George,
=20
The last straw was the new damper arrangement. Going from a 60 =
durometer to
a 50 durometer made some difference. I then hacked up one of the 60
durometer dampers so it would be softer, and have more flex. With that =
one,
I felt like the problem was gone. =20
=20
After some thought (staring it into submission), I figured out a way to =
make
a steel adapter to allow me to couple two 50 durometer dampers in =
series,
and still fit where it needed to go. After spending almost a week =
working
on it, and being very proud of what I was able to make on my home 3-in-1
machine, I finally gave it a try. Unfortunately, it wasn't good. =20
=20
This was a classic case of "if a little more is good, then a lot more =
will
be great". I ended up with a damper that was so soft, and had so much =
play
that it was like a rubber band. The result was almost as scary as that
wacky peroxide rotorcraft video I posted. The engine almost tore my =
test
stand apart before I could shut it down, and I'm probably lucky it =
didn't
chop me to bits just for spite. I had the video running, but all I got =
was
"memory card error" when I tried to view it. =20
=20
While this damper didn't work out as planned, there are still other
solutions I could try, and I'm sure it's possible to make this work.
Unfortunately, I've already spent almost 3 years (time flies) messing =
with
this, and there's just no escaping the fact that it's going to be too =
heavy
to be a 912S replacement. Until someone manufactures a better 100 HP =
rotary
solution (two rotor I hope), that they are actually willing to sell for
aircraft use, I'm afraid the 100 HP rotary isn't going to be much of an
option. The 912S so desperately needs competition...
=20
Rusty (UAVP) =20
------=_NextPart_000_0001_01C8343F.F8378030
Content-Type: text/html;
charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; =
charset=3Dus-ascii">
<TITLE>Message</TITLE>
<META content=3D"MSHTML 6.00.6000.16544" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV>What was the latest problem with the single development, was it the =
torsional reversals. The last I heard was you were going softer with the =
damper=20
material - did that work out?<SPAN class=3D343470923-01122007><FONT =
face=3DArial=20
color=3D#ff0000> </FONT></SPAN></DIV>
<DIV><SPAN class=3D343470923-01122007></SPAN> </DIV>
<DIV><SPAN class=3D343470923-01122007><FONT face=3DArial =
color=3D#ff0000>Hi=20
George,</FONT></SPAN></DIV>
<DIV><SPAN class=3D343470923-01122007></SPAN> </DIV>
<DIV><SPAN class=3D343470923-01122007><FONT face=3DArial =
color=3D#ff0000>The last=20
straw was the new damper arrangement. Going from a 60 durometer to =
a 50=20
durometer made some difference. I then hacked up one of the 60 =
durometer=20
dampers so it would be softer, and have more flex. With that =
one,=20
I felt like the problem was gone. </FONT></SPAN></DIV>
<DIV><SPAN class=3D343470923-01122007><FONT face=3DArial=20
color=3D#ff0000></FONT></SPAN> </DIV>
<DIV><SPAN class=3D343470923-01122007><FONT face=3DArial =
color=3D#ff0000>After=20
some thought (staring it into submission), I figured out a way to =
make a=20
steel adapter to allow me to couple two 50 durometer dampers in series, =
and=20
still fit where it needed to go. After spending almost a week =
working on=20
it, and being very proud of what I was able to make on my home 3-in-1 =
machine, I=20
finally gave it a try. Unfortunately, it wasn't=20
good. </FONT></SPAN></DIV>
<DIV><SPAN class=3D343470923-01122007></SPAN> </DIV>
<DIV><SPAN class=3D343470923-01122007><FONT face=3DArial =
color=3D#ff0000>This was a=20
classic case of "if a little more is good, then a lot more will be =
great". =20
I ended up with a damper that was so soft, and had so much play that it =
was like=20
a rubber band. The result was almost as scary as that =
wacky=20
peroxide rotorcraft video I posted. The engine almost tore my =
test=20
stand apart before I could shut it down, and I'm probably lucky it =
didn't=20
chop me to bits just for spite. I had the video running, but =
all I=20
got was "memory card error" when I tried to view=20
it. </FONT></SPAN></DIV>
<DIV><SPAN class=3D343470923-01122007></SPAN> </DIV>
<DIV><SPAN class=3D343470923-01122007><FONT face=3DArial =
color=3D#ff0000>While=20
this damper didn't work out as planned, there are still other =
solutions I=20
could try, and I'm sure it's possible to make this work. =20
Unfortunately, I've already spent almost 3 years (time flies) messing =
with this,=20
and there's just no escaping the fact that it's going to be too heavy to =
be a=20
912S replacement. Until someone manufactures a better 100 HP =
rotary=20
solution (two rotor I hope), that they are actually willing to sell =
for=20
aircraft use, I'm afraid the 100 HP rotary isn't going to be much of an=20
option. The 912S so desperately needs =
competition...</FONT></SPAN></DIV>
<DIV><SPAN class=3D343470923-01122007></SPAN> </DIV>
<DIV><SPAN class=3D343470923-01122007><FONT face=3DArial =
color=3D#ff0000>Rusty=20
(UAVP)</FONT></SPAN><SPAN=20
class=3D343470923-01122007> </SPAN></DIV></BODY></HTML>
------=_NextPart_000_0001_01C8343F.F8378030--