SpudFiles

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Amazing build, one of the best made piston hybrids I've seen for a while, you included alot of unique things into this cannon.
The only thing that I see uncomfortable are all the fittings in the back resembling a stock of some sort, I'm sure you could cut down on all the fittings and make a better, custome, stock for the launcher.
Very nice build again, good job, and I'll be awaiting damage pics from this monster

PS - where did you get the small MAPP tank?

great work there SpudBlaster, should be a nice hole puncher.
i like that way you mounted the fan.
only thing i can think if is a barrel support and BRING ON THE DAMAGE

i think the stock is also a meter.

Wow. Just when I start seriously thinking about upgrading my piston hybrid to be handheld and 1.5" porting... Time to find a welder.

Nice job!

What's your barrel made of? Do you have a diagram of your valve?

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SB15 - I hope this doesn't come across as arrogant (and its not meant to be by any means)...

But is that all there really is to the elusive piston hybrid???? It just seems... too simple? lol

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God! This is a great gun. It's clean, acceptable ROF and power all in one small compact package! It does make me wonder why everyone with "small" hybrids is using burst disk's..

A union is a bigger pain in the arse then building a piston valve I can imagine..

Ahh, this makes me want to build something new!


Good job!

looks great! is the piston sealing on the full od of the 1.5inch pipe or was that reduced slightly? if it wasnt reduced you will get some nice opening pressures without having a increased pilot area pressure!

Excellent piston. Please keep us posted on the durability of that one. I know the ABS is tough since I tested it in one of my cannons, but your test is much more extreme. The forces to crush it, stretch it, slam it, etc must be intense for use in a hybrid.

I wonder if the rear pipe can be extend somehow into the T so a shorter lighter piston can be used. It's performance may approach that of a burst disk.

The overall build is excellent. I was wondering about the amount of exposed threads and a total lack of marks from a pipe wrench. Is this simply hand tightened?

If I can find 1.25 ABS fittings, I may look into replacing the PVC piston in my ABS cannon so it is all ABS. It may be an easy way to get floating o rings on it.

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i like those opening pressures! the next thing i would worry about is sealing face being blown out during firing

cant wait to see it in action!

and if i may ask what is your fueling procces going to be?

SpudBlaster15 wrote:

SpudFarm wrote:God! This is a great gun. It's clean, acceptable ROF and power all in one small compact package! It does make me wonder why everyone with "small" hybrids is using burst disk's..

Thanks SpudFarm. I think most people use burst disks because they are simpler, easier to setup, and the "tried and true" method. Hybrid piston valves are still somewhat of an experimental concept, and with only 3 or 4 in existence, there's no standard set of design parameters which people can base their valves on. I'm hoping that by showing the internals of my valve, I'll bring understanding to a wider audience of spudders. Hopefully we'll see more piston hybrids in the future.

I am simply hoping to see more hybrids on this page. They are a bigger challenge then the simpler pneumatics and combustions.
Atleast I would like to build a piston hybrid now, I know "Galfisk" is working on his after abour three years of down time. His valve and metering system is something different!

A propane tank premixed with fuel/air and a marble hybrid would be so much fun! To bad I am to scared to use premixed chambers for fueling.

Good job once again!

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