[roc-chat] Re: Clarification
- From: "Chris Coffee" <chris_coffee@xxxxxxxxxx>
- To: <roc-chat@xxxxxxxxxxxxx>
- Date: Fri, 24 May 2013 20:51:18 -0700
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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