[NSRCA-discussion] Alabama Bound

[Bob Richards]

You probably already know this, but you would have to use a higher KV motor.
 
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. Also, the 70s era planes would like kinda stupid with 10" gear struts. :-)
 
Bob R.


--- On Wed, 11/25/09, Jerry Combs <jcombs1947 at att.net> wrote:


From: Jerry Combs <jcombs1947 at att.net>
Subject: Re: [NSRCA-discussion] Alabama Bound
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
Date: Wednesday, November 25, 2009, 12:50 PM


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.

Jerry

Scott, What is the reason behind a 13 inch prop limit for electric? There
isn't any limit on prop sizes for IC engines is there? A flyer with an IC
engine searches for the best prop size to the particular plane and engine
combo, it seems that electric flyers should have the same flexibility.
Dave Burton 
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