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Fly-K mortar - "captive piston" variation

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Fly-K mortar - "captive piston" variation

Unread postAuthor: jackssmirkingrevenge » Wed Mar 16, 2011 2:15 am

Rheinmetall's Fly-K mortar operates on the same spigot mortar principle as much earlier weapons like the PIAThowever it marries the idea with the captive piston principle to provide a relatively quiet shot:

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With some imagination I think the idea has potential for spudgun applications, something like this:
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Last edited by jackssmirkingrevenge on Thu Mar 17, 2011 1:50 am, edited 2 times in total.
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Unread postAuthor: Hotwired » Wed Mar 16, 2011 9:59 am

Also means more weight to carry if the projectile is taking the gas trap with it.

Depends how quiet you want to be.

Certainly a dam sight quieter than my last musings on hybrid launching which was literally launching an open chamber: http://www.spudfiles.com/forums/hybrid-rpg-launcher-t6559.html
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Unread postAuthor: jackssmirkingrevenge » Wed Mar 16, 2011 1:36 pm

Hotwired wrote:Also means more weight to carry if the projectile is taking the gas trap with it.

Depends how quiet you want to be.


It could be a good project for those with wide open areas to launch over, I certainly don't have the space :roll: I would envisage a parachute and camera...



Had you actually built that?
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Unread postAuthor: Hotwired » Wed Mar 16, 2011 4:49 pm

Nope.

But going on differences between a closed chamber and having a hollow chamber directing blast back at you. I'd still stand by it being a lot quieter :P
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 17, 2011 1:48 am

Hotwired wrote:But going on differences between a closed chamber and having a hollow chamber directing blast back at you. I'd still stand by it being a lot quieter :P


Indeed.

The Armbrust also uses the captive piston concept, however this time with two pistons travelling in opposite directions, one firing the projectile while the other fires a plastic countermass of the same weight.

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Unread postAuthor: jackssmirkingrevenge » Thu Sep 13, 2012 8:19 am

Another interesting "real world" example of the principle, the "Bigot" designed to be fired from a 0.45" pistol:
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