[roc-chat] Re: Clarification
- From: Allen Farrington <allen.farrington@xxxxxx>
- To: roc-chat@xxxxxxxxxxxxx
- Date: Fri, 24 May 2013 20:52:56 -0700
I would take the average of the first second.
Allen
--------------------------------------------------------------------
Allen H. Farrington
818-653-2284
web: http://www.allenfarrington.org
On May 24, 2013, at 8:51 PM, Chris Coffee <chris_coffee@xxxxxxxxxx> wrote:
> Thank you for the clarification, gentleman. Wedge, how exactly would I get
> the initial thrust data? Would that be the Maximum Thrust on the thrust curve
> site? Or is it a different number that I have to calculate somehow?
>
> From: Allen Farrington
> Sent: Friday, May 24, 2013 8:46 PM
> To: roc-chat@xxxxxxxxxxxxx
> Subject: [roc-chat] Re: Clarification
>
> 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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