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
>
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Received on Thu Jan 08 2009 - 07:36:40 CET