[roc-chat] Re: How Much Extra BP for Shear Pins?
- From: Chris J Kobel <Chris.J.Kobel@xxxxxxxx>
- To: roc-chat@xxxxxxxxxxxxx
- Date: Fri, 6 May 2011 21:26:33 -0700
I've successfully used the following relationship on over 75 successful
dual-deploy flights. I believe it was provided by someone on roc-chat
years ago (Dave Flynn?)
E-charges: BP(g)=.00051 x Length(in) x Force(lb) x (Peak Alt ASL/10K+1)
with an eject force somewhere between 100-200 lbs
Notice the equation is altitude corrected, as your "actual" ejection will
not occur at the same altitude as your ground test. (Hopefully)
Notice also that body tube diameter has been canceled out of the equation
during the math.
2-56 nylon bolts for shear pins; 35 lbs shear force each; 100 lbs w/o
pins, 200 lbs with
I often (mostly) use non-symmetric numbers of 2-56 shear pins (ie. one)
Chris Kobel
From:
"Lesnick, Mike" <mikel@xxxxxxxxxxx>
To:
<roc-chat@xxxxxxxxxxxxx>
Date:
05/06/2011 06:21 PM
Subject:
[roc-chat] How Much Extra BP for Shear Pins?
Sent by:
roc-chat-bounce@xxxxxxxxxxxxx
All,
One more question about shear pins.
If I use 2 or 3 2-56 nylon screws for shear pins, how much extra Black
powder do you think it would take to ensure the nose separates from the
airframe?
Mike
Michael Lesnick
Axiom Healthcare Group
18135 Santa Lauretta Cir
Fountain Valley, CA 92708
714-594-5720 - Office Phone
714-323-5968 - Cell
714-968-7076 - Fax
MikeL@xxxxxxxxxxx
From: roc-chat-bounce@xxxxxxxxxxxxx [mailto:roc-chat-bounce@xxxxxxxxxxxxx]
On Behalf Of MonsieurBoo@xxxxxxx
Sent: Friday, May 06, 2011 3:17 AM
To: roc-chat@xxxxxxxxxxxxx
Subject: [roc-chat] Happy 50th anniversary of Alan Shepard's first
Cornwallis, Yorktown, 1781 ;-)
Cheers
Mark L
In a message dated 5/6/2011 1:07:17 A.M. Eastern Daylight Time,
ecartis@xxxxxxxxxxxxx writes:
Rick "I mean, who *hasn't* beaten the French?" Dickinson
Other related posts:
