Re: Re: propellor and rubber of a F1D model

From: William D. Gowen <b.gowen_at_comcast.net>
Date: Mon, 10 Mar 2008 16:16:40 -0400

I haven't completely broken the habit of using thickness but I think the
weight per unit length becomes especially important in events with fixed
rubber weights. When I'm competing in F1M for example I know pretty
close to the exact motor length that will give me the best times on a
particular day and particular site (determined in practice flights).
Then when I'm doing official flights I will usually have all the motors
that are close to that length arranged on my table by length.

On Mon, 2008-03-10 at 20:06 +0000, kevin_f1m wrote:
> LeRoy,
>
> Because it's almost impossible to measure the thickness of rubber
> (because it's to soft to not compresse in a measerment gauge) most
> flyers use grams/meter wich is essentially the same as the thickness
> only much more accurate.
>
> So a piece of rubber of 2 grams from 3 g/m is about 0.67 meter long.
>
> Kevin
>
> --- In Indoor_Construction_at_yahoogroups.com, LeRoy C Cordes
> <lcordes_at_...> wrote:
> >
> > John, I don't understand what the "grams/metre" units denote - is
> that
> > weight per meter, essentially translating to rubber width ?
> >
> > LeRoy Cordes
> > AMA 16974
> > Chicago, IL
> > In God We Trust
> >
> > On Mon, 10 Mar 2008 09:09:04 -0000 "John Barker"
> > <john.barker783_at_...> writes:
> > > Kevin
> > > In response to one of the questions you asked, about number of
> > > turns. With
> > > the usual proviso about rubber batches varying, my turns formula
> > > gives the
> > > following figures which may be useful until something better
> comes
> > > along:
> > >
> > > grams/metre motor length maximum turns
> > > 1.2 9.8" 1797
> > > 1.3 9.1" 1594
> > > 1.4 8.4" 1426
> > > 1.5 7.9" 1286
> > > 1.6 7.4 1168
> > > All for a motor weight of 0.6 gram.
> > >
> > > John
> > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> > >
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> > LeRoy Cordes
> > AMA 16974
> > Chicago, IL
> > In God We Trust
> >
>
>
>
>
>
>


[Non-text portions of this message have been removed]
Received on Mon Mar 10 2008 - 13:15:53 CET