[roc-chat] Re: Clarification
- From: Allen Farrington <allen.farrington@xxxxxx>
- To: roc-chat@xxxxxxxxxxxxx
- Date: Fri, 24 May 2013 20:46:05 -0700
If you use a longer rail and have decent fins (2 calibers of CG over CP) then
you should be fine. Low wind as well would help.
Allen
--------------------------------------------------------------------
Allen H. Farrington
818-653-2284
web: http://www.allenfarrington.org
On May 24, 2013, at 8:43 PM, Wedge Oldham <wedgeoldham@xxxxxxxxx> wrote:
> The math is right; but you should use initial thrust rather than average
> thrust.
>
> On May 24, 2013 8:23 PM, "Chris Coffee" <chris_coffee@xxxxxxxxxx> wrote:
> A little help here, please? I need to know if someone can tell me if my
> calculations are correct for a Thrust-To-Weight calculation for an upcoming
> flight...and whether or not the rocket should be flown on said motor? Thank
> you.
>
>
> Madcow Sensor weighing in at 7 pounds on the pad. 54mm motor mount. Using a
> Cesaroni I100-RL-LB this is what I got:
>
> Average thrust of motor (according to ThrustCurve) = 98.5Ns
>
> Divide 98.5Ns by 4.45 to get 22.13 average thrust in pounds
>
> Divide 22.13 pounds of average thrust by 7 to get a Thrust-To-Weight ratio of
> 3.16:1
>
> Is this correct?
>
> If my math is correct, I would say that the rocket should not be flown with
> the I100.
>
> Okay, folks.....school me!!! LOL
>
>
> Christopher L. Coffee
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