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<font size=3>Bob, we had one, using a 16" prop...<br><br>
At 01:43 PM 11/25/2009, you wrote:<br>
<blockquote type=cite class=cite cite="">You probably already know this,
but you would have to use a higher KV motor.<br>
<br>
Since electric motors can be wound many different ways, it is possible to
run a much larger diameter prop at a lower rpm and have a more constant
speed aircraft than would be possible with an I/C engine, unless of
course you have a belt reduction drive like Dean Koger flew in the early
90s. (That thing was AWESOME!). That is one reason I can think of for the
13" prop restriction. </font><font size=4 color="#0000FF"><b>Also,
the 70s era planes would like kinda stupid with 10" gear
struts.</b></font><font size=3> :-)<br>
<br>
Bob R.<br><br>
<br>
--- On <b>Wed, 11/25/09, Jerry Combs
<i><jcombs1947@att.net></i></b> wrote:<br>
</font>
<dl><br>
<dd>From: Jerry Combs <jcombs1947@att.net><br>
<dd>Subject: Re: [NSRCA-discussion] Alabama Bound<br>
<dd>To: "General pattern discussion"
<nsrca-discussion@lists.nsrca.org><br>
<dd>Date: Wednesday, November 25, 2009, 12:50 PM<br><br>
<dd>I don't understand the 13" prop bit either. On my Axi
4130-20 on 6 cells a 13" prop gives me around 500 watts.<br><br>
<dd>Jerry<br><br>
<dd>Scott, What is the reason behind a 13 inch prop limit for electric?
There<br>
<dd>isn't any limit on prop sizes for IC engines is there? A flyer with
an IC<br>
<dd>engine searches for the best prop size to the particular plane and
engine<br>
<dd>combo, it seems that electric flyers should have the same
flexibility.<br>
<dd>Dave Burton <br>
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<font size=3><b><i>--></font>
<font face="Arial, Helvetica" size=3 color="#800000">There are only two
types of aircraft -- fighters and targets.<br><br>
</i></b></font><font size=3>Phil Spelt, Past President, Knox County Radio
Control Society, Inc.<br>
URL:
<a href="http://www.kcrctn.com/" eudora="autourl">
http://www.kcrctn.com<br>
</a>AMA--1294, Scientific Leader Member, SPA--177<br>
My URL:
<a href="http://mywebpages.comcast.net/~chuenkan/" eudora="autourl">
http://mywebpages.comcast.net/~chuenkan/<br>
</a> (865) 435-1476 v (865) 604-0541
c </font></body>
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