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From: liz@poppyrecords.invalid.invalid (Liz Tuddenham)
Newsgroups: sci.electronics.design
Subject: Re: OT: Repeatably lobbing "projectiles"
Date: Sun, 24 Nov 2024 14:36:33 +0000
Organization: Poppy Records
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Don Y <blockedofcourse@foo.invalid> wrote:

[...]
> Couldn't the plunger be "polystyrene cup shaped" so it stays behind
> for reuse, automatically?

No - because the cup has to be in contact with the projectile to
maintain its shape while it is accelerated up the barrel.  That means
the air pressure must be behind the cup.

The cup could be stopped rapidly at the mouth of the gun by some sort of
obstruction, but that would risk damaging it and/or fouling the
projectile.


-- 
~ Liz Tuddenham ~
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www.poppyrecords.co.uk