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Hybrid without bursting disc

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Hybrid without bursting disc

Unread postAuthor: Petitlu » Tue May 01, 2012 4:27 pm

To remove the rupture disc in a hybrid I thought this:
A little on the principle of Withoutloss.
Piston spring green is stiff enough to hold the piston plated Mix until desired (30bar for example), when fired the pressure pushes the piston back and use any hand in the barrel.
A latch prevents the piston back against the barrel like that all of the pressure in the barrel
Review it!

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Unread postAuthor: warhead052 » Tue May 01, 2012 5:53 pm

Good idea, but the problem may be with the latch, having to reset it all the time. And why not make it into hybrid cartridges?
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Unread postAuthor: Petitlu » Tue May 01, 2012 5:56 pm

hybrid cartridges?
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Unread postAuthor: warhead052 » Tue May 01, 2012 6:02 pm

Yes, kind of like firearm cartridges.
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Unread postAuthor: Petitlu » Tue May 01, 2012 6:06 pm

this would not be easy to do in small cartridges but you have to think about...
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Unread postAuthor: Gun Freak » Tue May 01, 2012 7:58 pm

This isn't really new, piston hybrids have long been around and the problem you are solving with the latch can be solved instead by a spool valve opened on the piston's backstroke. Take SB15 or MrCrowley's piston hybrids for example.
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Unread postAuthor: Zeus » Tue May 01, 2012 8:15 pm

It's a similar concept to SB's and MrC's pistons, but they don't use springs for a good reason. I'm waiting for Fnord to post the picture of a flattened spring.

The latch is clever too.
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/sarcasm, /hyperbole
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Unread postAuthor: Fnord » Tue May 01, 2012 8:36 pm

Every time I post this I have to go search for my posts containing the word "pancake" because I can never find the page it's on :P

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But yeah, springs are bad, mmkay? In terms of practical hybrid bumpers, they rate slightly above small woodland creatures.
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Unread postAuthor: jackssmirkingrevenge » Wed May 02, 2012 12:17 am

this was my tiny piston effort: http://www.spudfiles.com/forums/0-22-mi ... 22465.html

Another alternative is to have the projectile seal the barrel, being held in place by friction. Long thread but worth the read: http://www.spudfiles.com/forums/hybrid- ... 19504.html

The advantage is burst disk performance without having to change the disk.

The disadvantage is that you can only use hard and smooth projectiles that will take the pressure and seal adequately.
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Unread postAuthor: Petitlu » Wed May 02, 2012 12:24 am

it was an idea, but it does not serve science :D
Great job Jack !

Thank you all
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Unread postAuthor: Petitlu » Wed May 02, 2012 1:17 am

I thought to use this system to make a full auto but JSR has already made ...
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Unread postAuthor: jackssmirkingrevenge » Wed May 02, 2012 1:23 am

what do you mean?

As far as I know no one has ever made a full auto hybrid.
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Unread postAuthor: Petitlu » Wed May 02, 2012 1:30 am

full auto air! :D

http://www.spudfiles.com/forums/rattles ... 17995.html

the difference, my system would coaxial ...
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Unread postAuthor: jackssmirkingrevenge » Wed May 02, 2012 2:46 am

pop-pop-pop :D I need to revisit that idea now that I have machine tools...
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Unread postAuthor: Hotwired » Wed May 02, 2012 2:52 am

Fnord wrote:Every time I post this I have to go search for my posts containing the word "pancake" because I can never find the page it's on :P

Image

But yeah, springs are bad, mmkay? In terms of practical hybrid bumpers, they rate slightly above small woodland creatures.


You know how this forum has a thing about nagging people for using the right chamber material for the right pressure.

Somewhere I imagine there is a forum which will do the same thing if you ask if *random spring* will be suitable for a hybrid bumper.

The answer of "How long is a length of string" would be the first suitable answer.

Springs have to be specced for the job just like anything else.

That one for example has been way over compressed. It should have been able to absorb the bumpers energy before the coils were compacted and crushed.

Multiple springs or more complex springs can be designed to vary how much resistance the bumper meets along its travel.

For example a "light" pressure holding the piston closed but after a certain distance it meets considerably more resistance while still not crushing any coils. A combo example would be a spring plus a foam bumper with the spring providing pre-firing resistance and the foam acting as the final stage of absorbing the energy from the piston.

The space for the spring also needs to be designed correctly so that it is free to move and will provide the right compression for the spring to provide the right force.

However, it's far cheaper and easier to wodge in a few inches of closed cell foam, call it a day and replace when the foam is crushed to a pancake.
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