[roc-chat] Re: BP for Deployment of Main Question
- From: "Kenny Curran" <rocket1dog@xxxxxxx>
- To: <roc-chat@xxxxxxxxxxxxx>
- Date: Thu, 8 Dec 2011 11:34:59 -0800 (Pacific Standard Time)
At the risk of sounding really stupid, wouldn't you just wire each e match
to the terminal block directly?
-------Original Message-------
From: Richard Dierking
Date: 12/8/2011 10:53:43 AM
To: roc-chat@xxxxxxxxxxxxx
Subject: [roc-chat] Re: BP for Deployment of Main Question
One possible failure mode: If it's in parallel, if one of the matches is
bad and doesn't have continuity, you will not know, because the altimeter
will detect continuity in the second and indicate that everything looks OK.
So one canister would go, but probably not be enough BP for a successful
deployment.
We tested two matches in series yesterday, and they both went fine. I've
been using series for airstarts and haven't had a problem (up to 4 engines).
I thought people were crazy when I first heard about using series, but when
a match lights the "plasma ball" becomes very conductive for a moment.
However, I have not used series for deployment charges, so thought it would
be a good idea to hear from people that had experience with this.
Richard
> From: xsive.guy@xxxxxxxxx
> Date: Thu, 8 Dec 2011 10:39:46 -0800
> Subject: [roc-chat] Re: BP for Deployment of Main Question
> To: roc-chat@xxxxxxxxxxxxx
>
> Definitely in parallel. Otherwise, when the first one burns out the
> rest would stop getting current. By wiring them in parallel even
> after the first one goes the rest continue to get current.
>
> I'd like to know the answers to your other questions though.
>
> Thanks,
> Mike
>
> On Thu, Dec 8, 2011 at 10:09 AM, Richard Dierking
> <redierking@xxxxxxxxxxx> wrote:
> > 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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