[roc-chat] Re: BP for Deployment of Main Question
- From: David.P.Smith@xxxxxxx
- To: roc-chat@xxxxxxxxxxxxx
- Date: Thu, 8 Dec 2011 11:11:31 -0800
I use the "rule of thumb" on
this site.
http://www.vernk.com/EjectionChargeSizing.htm
So, by that site you would need 4 grams
of ffffg black powder.
Remember that you are looking at a lot
of area to apply the ejection pressure to. A 7.5 inch circle had
a bit over 23.5 square inches of are. So 10 psid will give you 235
pounds of ejection force.
What is the shear force rating for your
pins?
David P Smith
NAR 78668 L2
Amateur Extra, W6DPS
- The opinions expressed in this email are my own and do
not necessarily represent the positions, strategies or opinions of Southern
California Edison, its parent company Edison International, or any of their
affiliates.
|
From:
Richard Dierking <redierking@xxxxxxxxxxx>
To:
<roc-chat@xxxxxxxxxxxxx>
Date:
12/08/2011 10:10 AM
Subject:
[roc-chat] BP
for Deployment of Main Question
Sent by:
roc-chat-bounce@xxxxxxxxxxxxx
Say your main deployment section is 7.5"
diameter, 24" long and using three (3) 2-56 nylon shear pins. How
much BP?
Also, what's the advantage of using two or more deployment canisters instead
of just one? For multiple canisters, would you wire in series or
parallel? (One 9 volt battery and Perfectflite WD altimeter with
main deployment at 1100'.)
Richard Dierking
BTW: Kurt, we're not intending to turn the nose into a second stage :-)
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