[NSRCA-discussion] Alabama Bound

[Phil Spelt]

Bob, we had one, using a 16" prop...

At 01:43 PM 11/25/2009, you wrote:
>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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-->There are only two types of aircraft -- fighters and targets.

Phil Spelt, Past President, Knox County Radio Control Society, Inc.
        URL: http://www.kcrctn.com
AMA--1294,  Scientific Leader Member, SPA--177
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