<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body text="#cc0000" bgcolor="#ccffff">
Charlie, I suspect an additional factor in the complicated mix is the <u>instant</u>
torque that is a characteristic of the e-power systems...<br>
<br>
On 12/4/2012 8:02 AM, Charlie Barrera wrote:
<blockquote cite="mid:000501cdd21f$a8d9af30$fa8d0d90$@net" type="cite">
<meta http-equiv="Content-Type"
content="text/html; charset=ISO-8859-1">
<meta name="Generator" content="Microsoft Word 12 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<p class="MsoNormal">I torqued the nose off of the fuselage of my
WindS Pro. I have a 2 meter WindS Pro which I recently acquired from a
good friend. The model is probably 2 years old and has close to 200
flights. The model had a contra rotating propeller power system
installed before I acquired it. The nose section had been modified to
accommodate zero degree down thrust and zero degree right thrust. I
installed a new Hacker Q80 motor on the nose, attaching it to the nose
ring. I did not reinforce the rear of the motor to the fuselage. I
re-modified it for 2 1/2 degree right thrust and 1 degree down thrust.
I reinforced it amply and was confident in the installation.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I made a normal takeoff at about half throttle.
As I turned to a right downwind, I powered up to about 3/4 throttle for
my usual trim pass. I was in a right bank, and was rolling to the
right. I heard a very loud "whack" noise. I continued my turn and only
then did I realize that something had changed. I managed to land the
model, not realizing that I had lost the motor. It was difficult
landing because of the resultant aft CG. The fuselage was missing the
first 4 inches. It was also very apparent that torque had sheared the
motor off the fuselage. I theorize that the combination of the right
roll and the power up caused a gyroscopic effect on the model, shearing
the nose off the model.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I wanted to share this to possibly alert others
to a nose ring installation of their high power motors. Be aware of the
forces that can be produced by these high torque motors. I don't know
whether providing a rear brace on the installation would have made a
difference. I don't think so. The fuselage was "torn" well behind where
the rear brace would have been.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<pre wrap=""><fieldset class="mimeAttachmentHeader"></fieldset>
_______________________________________________
NSRCA-discussion mailing list
<a class="moz-txt-link-abbreviated"
href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a>
<a class="moz-txt-link-freetext"
href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a></pre>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Phil Spelt, KCRC President
AMA 1294 Scientific Leader Member
SPA 177 Board Member
(865) 435-1476v, (865) 604-0541c</pre>
</body>
</html>