[BProckets] Cluster ejection

[mrgizmo]

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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