[BProckets] Cluster ejection

[Mike Harris]

No it is not a great idea. Maybe now your motor that didn't start now fires 
up from the top from the match at the same time the chute ejects thus 
turning it into an interesting pyro sky work that hopefully at best results 
then in a flame flare (burning rocket) coming down under chute.

Most likely you won't be *that consistent* with your ejection delays and 
that the bonus charges won't blow anything up. Any charges post fact are 
not relevant. So use shear pins, not friction fit, for your nose cone, and 
have a long enough shock cord to dissipate even a triple ejection 
separation, and you should be fine.

Either that or, as most with EX do, use electronics for any ex motor. Along 
those lines, the magnetic apogee kits are cheap, effective, and cool.

Sure it's cool to do *everything* including ejection delays, but it's 
another problem to learn to do right and is perhaps the most critical short 
of not cato'ing your motors, so why not ensure you get your rocket back for 
it's next flight.

regards, Mike

At 02:03 PM 2/28/2005, mrgizmo wrote:
>That is a great idea about using 1 chage that is quickmatched to all theee
>motors, I never thought of that, its likely what I will use.
>
>----- Original Message -----
>From: "Dan Durachko" <DanDurachko at psu.edu>
>To: "'Black Powder rockets discussion list'" <bprockets at amateurrocketry.com>
>Sent: Monday, February 28, 2005 12:27 PM
>Subject: RE: [BProckets] Cluster ejection
>
>
> > I imagine the engine loading procedure and mount design would preclude
>such
> > a measure but could you cross-match (w/quickmatch) all three of the
>ejection
> > charges to synchronize them and ensure ejection?  Also, I imagine there's
> > enough slop in powder amounts for efficient ejection that you could load
> > each of the three engines in the cluster with 1/2 the amount needed for
> > positive ejection and even if all three fired you still wouldn't cause any
> > damage?  Let me know how things work out and how you did it.
> >
> >
> > Good point, I guess the dilemma isuse one ejection charge and if that
>motor
> > dosnt ignite the fiberglass nosecone turns into a pretty dangerous
> > projectile. But if I use 3 unsyncronised ejection charges the result could
> > burn up the chute(s).
> >
> > > >I am currently finishing up a 1/3 scale Harpoon AGM-84, which will fly
>on
> > a
> > > >cluster of 3 G-75's I was just wondering if I should just set up one of
> > the
> > > >motors with an ejection charge or all three?
> > >
> > > I've wondered about this too.  I guess it kind of boils down to whether
> > you
> > > feel you can reliably get ignition of all 3 engines in the cluster.  How
> > bad
> > > might 3 synchronized (or unsynchronized) ejection charges be anyway???
> >
> >
> >
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>
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