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My friend's hybrid plans

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My friend's hybrid plans

Unread postAuthor: elad311 » Tue Oct 21, 2008 1:48 pm

Today, I found out that my friend interest in spud guns, and he saw
me some hybrid plans he made, he wanted me to upload it to the site,
so you'll tell if it's good, if it is, me and him will build it!
here:
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Unread postAuthor: jonnyboy » Tue Oct 21, 2008 1:55 pm

If that second ball valve off the propane tank is to vent you might as well put a quick connect there for the air. While the schrader will work it just seems nicer to have a quick connect. The burst disk holder in the diagram is called a union. I would get a copper barrel just for safety in case you get an ammo jam.
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mobile chernobyl wrote:I can shoot a Canuter Valve off my '82 Chevy Ram F150 AT LEAST 3/4 Mile with 'ma cannon made of soup cans duct taped together, then I just squirt some bacardi 151 in the chamber and hold up my cigarrete lighta and WHOOSH! That thing flies at least 3/4 mile
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Unread postAuthor: elad311 » Tue Oct 21, 2008 2:06 pm

Ok, we can get copper..
but, do you think it will work good?
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Unread postAuthor: ramses » Tue Oct 21, 2008 2:42 pm

that depends on a slew of things. check out HGDT and plug in your planned numbers.
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Re: My friend's hybrid plans

Unread postAuthor: Ragnarok » Tue Oct 21, 2008 3:02 pm

elad311 wrote:so you'll tell if it's good, if it is, me and him will build it!

Being completely and utterly honest, based on what I know of your spudgun knowledge, I would strongly dissuade you from building a hybrid at this stage.

Hybrids, although they can be entirely safe in the hands and construction of an experienced spudder, are not to be trifled with, especially when your knowledge of launching in general is limited.
You might get lucky and do it fine - but you are far more likely to make a mistake you don't even know could be dangerous and do yourself a major mischief.

Seriously, at least churn out a couple of basic cannons before you start dabbling in hybrids.
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Re: My friend's hybrid plans

Unread postAuthor: elad311 » Tue Oct 21, 2008 3:18 pm

Ragnarok wrote:Being completely and utterly honest, based on what I know of your spudgun knowledge, I would strongly dissuade you from building a hybrid at this stage.

Hybrids, although they can be entirely safe in the hands and construction of an experienced spudder, are not to be trifled with, especially when your knowledge of launching in general is limited.
You might get lucky and do it fine - but you are far more likely to make a mistake you don't even know could be dangerous and do yourself a major mischief.

Seriously, at least churn out a couple of basic cannons before you start dabbling in hybrids.


Yea, but my friend know about spud guns, and i sure he'll fix my mistakes..
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Re: My friend's hybrid plans

Unread postAuthor: Ragnarok » Tue Oct 21, 2008 3:55 pm

elad311 wrote:Yea, but my friend know about spud guns

That may be a different matter, and I can see that design, apart from the suggested use of PVC is largely OK - But I have no proof about your friend's skill (even the design, which is largely identical to a basic design that's been around for a while), so I have to base my decision on what I know of you.

Under those circumstances, I wouldn't recommend it.

The other thing is if your friend has experience, it would be nice to see him on these forums. No offence of course, but usually when giving advice to a pair of people, it's usually best to give it to the more experienced one, to avoid playing Chinese whispers by giving it to the other.

and i sure he'll fix my mistakes..

Much better not to make them in the first place.
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Re: My friend's hybrid plans

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Unread postAuthor: jonnyboy » Tue Oct 21, 2008 4:00 pm

As ramses said performance depends on a bunch of stuff. Look around here in the hybrid showcase.

I just noticed you don't have anything about ignition in the plans. A peizo won't cut it for a hybrid a stun gun circuit would be easy to get a hold of but there are alot of options.
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mobile chernobyl wrote:I can shoot a Canuter Valve off my '82 Chevy Ram F150 AT LEAST 3/4 Mile with 'ma cannon made of soup cans duct taped together, then I just squirt some bacardi 151 in the chamber and hold up my cigarrete lighta and WHOOSH! That thing flies at least 3/4 mile
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Unread postAuthor: mark.f » Tue Oct 21, 2008 4:02 pm

I strongly disagree. Every hybrid I've made has utilized either a piezoelectronic BBQ igniter or small element out of an aim n' flame igniter.
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Unread postAuthor: jonnyboy » Tue Oct 21, 2008 4:37 pm

It will work but with any decent mix you will need such a small gap it could take hours to get small enough.
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mobile chernobyl wrote:I can shoot a Canuter Valve off my '82 Chevy Ram F150 AT LEAST 3/4 Mile with 'ma cannon made of soup cans duct taped together, then I just squirt some bacardi 151 in the chamber and hold up my cigarrete lighta and WHOOSH! That thing flies at least 3/4 mile
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Unread postAuthor: DYI » Tue Oct 21, 2008 4:52 pm

It will work but with any decent mix you will need such a small gap it could take hours to get small enough.


Before my hybrids got up into the 250psi+ range, I routinely made gaps smaller than 0.5mm in a minute or less with heavy electrodes which I manipulated with pliers, and they worked quite consistently with a relatively low voltage power source, even with 50 yards of speaker wire between the current source and the gap.

If you're going to be close to it (close for me being less than 30 feet, which isn't a huge risk in the case of this design), a piezo should be perfectly fine. If you need anything more than a single, tiny spark to ignite the mix, then it isn't mixed properly.
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Unread postAuthor: jonnyboy » Tue Oct 21, 2008 5:30 pm

Huh I thought I saw somewhere on here someone said you couldn't use a peizo in a hybrid.
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mobile chernobyl wrote:I can shoot a Canuter Valve off my '82 Chevy Ram F150 AT LEAST 3/4 Mile with 'ma cannon made of soup cans duct taped together, then I just squirt some bacardi 151 in the chamber and hold up my cigarrete lighta and WHOOSH! That thing flies at least 3/4 mile
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Unread postAuthor: TurboSuper » Tue Oct 21, 2008 6:03 pm

Looks good to me, although controlling the amount of propane getting to the chamber may be an issue. I'd reccomend connecting a meter pipe in "series" between the tank and the chamber.
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Unread postAuthor: elad311 » Wed Oct 22, 2008 3:04 am

Is it good to move the schrader, so it'll be near the pressure gauge?
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