prop speed; when does it create drag?

[Wayne Galligan]

Great question John.

Is something like an 1800rpm idle slow enough to create drag while landing?
I guess would depend several things like actual airspeed, prop size and
pitch # of blades, blade width.

WG

----- Original Message ----- 
From: "John Ferrell" <johnferrell at earthlink.net>
To: <discussion at nsrca.org>
Sent: Wednesday, December 03, 2003 5:39 PM
Subject: Re: Winter / Focus / Fuel/Electric.


> As I am sure you are aware, full scale pilots have been taught for many
> years that a windmilling prop creates more drag that a stopped prop.
>
> How do you determine what rpm generates the most drag?
>
> John Ferrell
> 6241 Phillippi Rd
> Julian NC 27283
> Phone: (336)685-9606
> johnferrell at earthlink.net
> http://home.sprintmail.com/~johnferrell/dixiecompetitionproducts/
> NSRCA 479 AMA 4190  W8CCW
> "My Competition is Not My Enemy"
>
>
> ----- Original Message ----- 
> From: "Doug Cronkhite" <seefo at san.rr.com>
> To: <discussion at nsrca.org>
> Sent: Wednesday, December 03, 2003 4:28 PM
> Subject: RE: Winter / Focus / Fuel/Electric.
>
>
> >
> > Well.. you fix that by setting a good idle speed before you take off.
You
> > never let the motor stop in flight for a few reasons.. 1) as you
> > described, it looks weird.. 2) a stopped prop is not the best solution
for
> > downline breaking.. 3) the start/stop is hard on the gears..
> >
> > -Doug
>
>
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