Re: Re: Fai rubber

From: William Gowen <wdgowen_at_gmail.com>
Date: Mon, 15 Aug 2016 11:42:13 -0400

I haven't done any flight testing of TSS but I did some bench testing a
year or so ago. My feeling is that you need to operate TSS at a
considerably higher torque range to get the best energy return from it. For
my F1M flying I'm already using launch torques over 1 in-oz which makes
motor loading very scary. I don't think I want to try to push my luck by
using torques maybe 50% higher.

When I tried the obvious solution of testing a thinner motor that would
have a similar max torque to my usual motors I found that the mid range and
bottom end torque was not nearly as good as the best Tan2 batches.

At least we can see that TSS is evolving in a positive direction.

On Mon, Aug 15, 2016 at 9:47 AM, mkirda_at_sbcglobal.net [Indoor_Construction]
<Indoor_Construction_at_yahoogroups.com> wrote:

>
>
> Hi Vladimir.
>
> I flew with it yesterday in Rantoul. The conditions were in the mid-70's,
> with fairly high humidity.
> These are all subjective.
>
> At the NATS, I flew my Coconut scale model Taylorcraft with a relatively
> crappy batch of TSS ('04) with six strands. Yesterday I bumped it up to 8
> strands of June 2016 with a longer motor and had trouble keeping it out of
> the ceiling. It torques up nice. If I stay with this much rubber, I will
> need to make the motor longer and braid it, also increase the prop pitch.
>
> LPP. I used only one prop and this has issues when launched at higher
> torques as the flair is quite uneven now. I ended up with an 18 to 18.5"
> loop of 0.101" giving me fairly consistent times of just under ten minutes.
> Several times it bunched up in such a way that it gave me an unwanted
> torque burner - those times were significantly lower. Again, rubber torques
> up quite high and my prop did not like launching at more than 0.6 in-oz of
> torque. It would already wobble a lot at that, but higher than that it
> looked like it was drunk or having a seizure or doing some sort of weird
> dance. Had I spent a bit more time with it, I know I could have gotten it
> to break 11 minutes.
>
> F1D - One good hard wind, backed off to a reasonable launch torque of
> about 0.4 in-oz. Noticed as I was loading it that it seemed to have more
> pull than 5/99 or 3/02, and impression was more torque with less max winds.
> Fuselage folded right past the front brace, in front of the wing post. Was
> able to cut the motor and save everything but the motor stick. At that
> point I put it back away.
>
> Will do some real testing soon.
>
> Regards.
> Mike Kirda
>
>
Received on Mon Aug 15 2016 - 08:42:16 CEST

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