Re: Comparing Rubber Batches

From: ewmonda <ewmonda_at_hotmail.com>
Date: Thu, 03 May 2007 14:57:28 -0000

Tapio,

I should include some follow-up data. After my post, I received
numerous tips on winding from accomplished fliers. Using their
methods of winding, I was able to significantly increase both the
maximum number of turns, as well as the torque at a given number of
turns remaining. I am now able to wind 1/05 to ~4800 ft-lbs/lb and
6/06 to ~4400 ft-lbs/lb, and am sure that I can increase those a bit
more as I practice winding. Looks like winding technique makes all
the difference.

Eric Monda



--- In Indoor_Construction_at_yahoogroups.com, Tapio Linkosalo
<tapio.linkosalo_at_...> wrote:
>
>
> On Fri, 27 Apr 2007, ewmonda wrote:
>
> > I entered the data I had already collected and came up with a
value
> > for 7/02 and 1/05 of about 3450 ft-lbs/lb. In comparison, the
6/06
> > was down around 3000 ft-lbs/lb. Do these numbers make sense with
> > what others have seen and can these batches really be so much
worse
> > than the good batches of TAN II?
>
> I have been testing my wakefield motors for quite a few years now,
and my
> results agree with Freds. I use a stretch method, as winding would
be too
> hard for multi-strand wakefield motors... 1999 was the prime year
of
> rubber, and the worse Tan II may be up to 6% down from those
batches. The
> best Super Sport that I have seen has been up to the level of
worst T2, or
> about 6% down from best T2, but the worse batches are another 6%
down. The
> latest SS, Jan07 was a big disappoinment, it was supposed to be
ok, but my
> tests strongly disagreed.
>
> See www.helsinki.fi/~linkosal/rubbertest.GIF
>
>
>
> -Tapio-
>
Received on Thu May 03 2007 - 07:58:20 CEST