I think the length would need to be sixteen times longer for double
the diameter, since the twist angle is proportional to the length and
inversely proportional to the fourth power of the diameter.
Ray
--- In Indoor_Construction_at_yahoogroups.com, <RLBailey@...> wrote:
>
> My own torque meter for F1D etc has 0.016" wire 11" long which
happily takes a full turn to give 45 gcm without taking on a
permanent set. This is, of course vital to ensure that the reading
returns to zero when the torque is removed.
>
> If you use a wire with eg double the diameter, you will need double
the length for a full turn.
>
> Bob
>
> ----- Original Message -----
> From: Bruce McCrory
> To: Indoor_Construction_at_yahoogroups.com
> Sent: Thursday, January 08, 2009 4:37 AM
> Subject: [Indoor_Construction] Re: indoor torque meter
>
>
> Being someone who works harder to find an on-line calculator than
sit
> down and not trust my own math, I discovered that the torque wire
> calculator in the utilities section at Indoor News has a virus.
>
> I don't think 1 in-oz in 360-degree twist for .015" steel wire
> requires nearly 2 miles of wire. Seemed reasonable for the
example of
> half-in-oz.
>
> Lost my membership, so someone may see this and inform the web
master
> over there.
>
> Bruce
> in Seattle
>
> --- In Indoor_Construction_at_yahoogroups.com, "John Barker"
> <john.barker783_at_> wrote:
> >
> > Mark
> > You say that your Mini Stick torque meter has a wire length of
7.4
> inches
> > and gives a torque of 0.24 inch.ounces at full scale deflexion.
My
> > calculations say that your wire diameter was 0.011 inches.
> >
> > You wondered in your response to Leroy if the subject was still
> current.
> > Whether it was current or not it was still useful. I too have
been
> playing
> > with LPPs and Mini Sticks and things in between with two torque
> meters and I
> > find it not enough. The great difference between maximum torque
> and cruise
> > torque on a rubber motor means there is a compromise between
> overloading the
> > meter and sufficient accuracy at the low torque end. Before
making
> any more
> > meters I should be interested to know what Full Scale
Deflexions
> other
> > flyers are using for their range of meters.
> >
> > John Barker - England
> >
>
>
>
>
>
>
> --------------------------------------------------------------------
----------
>
>
>
> No virus found in this incoming message.
> Checked by AVG - http://www.avg.com
> Version: 8.0.176 / Virus Database: 270.10.5/1882 - Release Date:
1/8/2009 8:13 AM
>
Received on Thu Jan 08 2009 - 17:46:53 CET