Re: Rubber testing - some info

From: joemargbartek <j.bartek_at_sbcglobal.net>
Date: Wed, 14 Nov 2012 22:55:28 -0000

Mike
Has a reference been posted to the formula Jeff uses to get energy? Is it in a particular issue of INAV?

Joe

--- In Indoor_Construction_at_yahoogroups.com, "mkirda@..." <mkirda@...> wrote:
>
> Greetings.
>
> Jeff Annis sent me the spreadsheet he uses for computing the energy level of rubber.
>
> After some false starts, I have learned a few things.
>
> 1) Three of the four batches of rubber are nearly the same at near 4000.
> 2) 6/12 Tan SS is the worst at 3400 at best.
> 3) A second wind immediately after the first may get you 200 more turns, but energy return is significantly (15%) less. With the Tan SS I have, you really run the risk of breaking the motor - which somewhat explains the problems I had earlier I thought were related to the o-rings I was using.
>
> I have been winding ~.054" motors to .55 or so in-oz of Torque, then unwinding 20 turns at first, then 50, sometimes up to 100. After unwinding, it takes some time for the torque meter to steady. A light thump on the rubber seems to make is stabilize quickly. A lot of data points are involved.
>
> I'll probably share the data after I compile some more.
>
> Regards.
> Mike Kirda
>
Received on Wed Nov 14 2012 - 14:55:31 CET