[roc-chat] Re: How Much Extra BP for Shear Pins?
- From: Don Krause <don.krause@xxxxxxxxx>
- To: "roc-chat@xxxxxxxxxxxxx" <roc-chat@xxxxxxxxxxxxx>
- Date: Sun, 8 May 2011 13:30:15 -0700
I've been waiting for Kurt's pound per pin approach.
--
Don Krause
From the depths of my imagination. (with a little help from the spel checker in
my iPhone)
On May 8, 2011, at 12:43 PM, Mike & Nancy Kramer <kramer@xxxxxxxxxxxx> wrote:
> all this talk about BP and not a single Kurt Gugisberg joke,
>
> frankly I'm a bit disappointed in the collected masses...
>
> On 5/8/2011 12:21 PM, Robert Braibish wrote:
>>
>> Mike, Vern Knowels is a rocketeer from the northwest (Idaho) who has an
>> amazing website with all kinds of information. He chronicles
>> his building of several rockets and includes a wealth of information about
>> things like this. He also explains how and why which I find very helpful. I
>> recommend you give his site a visit...but plan on staying awhile! Oh, he
>> also has some great videos and pictures.
>>
>> Www.vernk.com
>>
>>
>> Sent from Yahoo! Mail on Android
>>
>>
>> From: Lesnick, Mike <mikel@xxxxxxxxxxx>;
>> To: <roc-chat@xxxxxxxxxxxxx>;
>> Subject: [roc-chat] Re: How Much Extra BP for Shear Pins?
>> Sent: Sun, May 8, 2011 2:55:38 PM
>>
>> Thank you to all who helped with comments on BP & Shear Pins. Another
>> question:
>>
>>
>>
>> QUESTION - Does anyone have a formula for the “air sampling hole” or Static
>> port hole (not sure what the correct name is) for
>> the altimeter bay?
>>
>>
>>
>> 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 Gene Engelgau
>> Sent: Saturday, May 07, 2011 6:34 AM
>> To: roc-chat@xxxxxxxxxxxxx
>> Subject: [roc-chat] Re: How Much Extra BP for Shear Pins?
>>
>>
>>
>> Hi all - IMHO it is a mistake to not use them symmetrical. So 1 pin is out.
>> But more than that number spaced evenly around the airframe is good. Of
>> course smaller airframes like 54mm would need only 2 2-56 nylon. Large 7.5"
>> maybe 4 4-40 nylon screws.
>>
>> YMMV...
>>
>> -G
>>
>> On Fri, May 6, 2011 at 9:26 PM, Chris J Kobel <Chris.J.Kobel@xxxxxxxx> wrote:
>>
>> 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?
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