Re: MultiRubber13 spreadsheet

From: William Gowen <wdgowen_at_gmail.com>
Date: Sun, 8 Jul 2012 20:29:12 -0400

Mike
FWIW I have max turns and torque built into my flight data spreadsheet so
that every time I wind a motor I have a goal in mind for that particular
motor. When I wind a 5/99 motor I will normally hit max torque before I hit
max turns. When I use 2/99 I almost always have more turns and less torque
than the formula says.
On Jul 8, 2012 9:31 AM, "mkirda_at_sbcglobal.net" <mkirda_at_sbcglobal.net> wrote:

> **
>
>
> So I have a question on this spreadsheet.
>
> I have some TanII of unknown provenance. Let me be wildly optimistic and
> click on May 99.
>
> IIRC, 0.053" motors are 16 or 16.5" in length, so let's say an 8" loop for
> 0.6 grams.
>
> I'll be wildly optimistic again and say I can get 100% of the turns. I use
> a 15:1 winder.
>
> The spreadsheet returns: torque 0.430 in-oz with 84 turns.
>
> I know my motors at USIC would take 100 winder turns. I often launched
> with .475 in-oz and would have launched at 0.5 in-oz (I backed off from
> that level) if I could have gotten my prop adjusted correctly (at .475 it
> was hitting the roof).
>
> I guess what I am asking is why the numbers seem low/off?
>
> Regards.
> Mike Kirda
>
>
>
Received on Sun Jul 08 2012 - 17:29:13 CEST