Re: Comparing Rubber Batches

From: ewmonda <ewmonda_at_hotmail.com>
Date: Fri, 27 Apr 2007 17:50:32 -0000

Mark,
When I get home tonight, I'll have to check the 7/02 batch again. I
didn't quite wind that batch to breaking since I have very little of
it, but the torque was certainly getting near vertical.

In a somewhat related topic, any guesses on the relatively large
discrepancy between the 3/02 energy density on Fred Tellier's webste
and Fred Rash's program posted online on this website? 3850 vs.
5000 seems pretty significant. When specs for a similar rubber band
(9.5", 0.6g) are entered in Rash's program, the max number of turns
is comparable to Tellier's spreadsheet, but the max torque and
torque at a given number of turns through the cruise are much lower
(~20%). Can so much variation exist within one batch?

Eric Monda

--- In Indoor_Construction_at_yahoogroups.com, "Sandy Schaefer"
<SandySchaefer708_at_...> wrote:
>
> Eric,
>
> The 7/02 is only batch I can comment on. It is considered a good
Tan II known for extra turns with fair total energy and less torque
per turn. Comparing it to 3/02 on Fred's spreadsheet it should
follow those
> statements in first sentence. Your results of "3450 ft-lbs/lb"
appear low it should have another 1,000 plus. Check number of turns
your getting into motor compared to 3/02, it should be more.
>
>
> MS
>
>
> [Non-text portions of this message have been removed]
>
Received on Fri Apr 27 2007 - 10:58:57 CEST