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Sam's Hybrid Plans H.V.S-1

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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Sam's Hybrid Plans H.V.S-1

Unread postAuthor: spanerman » Thu Jul 12, 2007 7:52 am

Well heres my plans, the chamber is a 6inch long 1.5inch pipe nipple...it has a meterd propane injection system, a HVSG and spark plug ignition and i hop to run it at a 5x mix.....ooooo that Should be supersonic..everything is steel apart from the barrel which is 15mm copper....which is the only thing il be woried about failing.

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it will be mounted on some plywood. This cannon is only a test bed for my futre plans....i have some 60mm stainless pipe.......ooooo and i can get it welded...think mach 2. but thats a few years away i think

would a bbq sparker with a tiny gap (~1mm) work with a 5x hybrid? anyone?

and another question...roughtly what pressure of propanr am i goin to need? as im goin to be using a large tank and im unsure iff i can take a direct tap feed from the tank to the regualator...so i may have to use a regulator with fixed output and a fariable output regulator to make it the ideal pressure for the meter?
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Unread postAuthor: CannonBall » Thu Jul 12, 2007 3:40 pm

Dude that isn't you own design you just copied it.....
Plzz give credit to tylerthetatertosser cause its exactly the same..
AS for your calculation try it yourself first than ask somebody else..
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Unread postAuthor: spanerman » Thu Jul 12, 2007 3:47 pm

imatation is the upmost form of flattery my friend! i have improves upon his design as i will be using a regulator for ease of use... and i will be using a different sparker so its not exactly the same...does every person who makes a inline sprinkle valve pneumatic pay creddit to the first? no! and BTW i have tried the calculations and tied myself in knots so i then asked, tylerthetatertosser what pressure of propane are you useing per ATM of air? and is it possible to use butane in a hybrid? what is the optimum mix for butane?
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Unread postAuthor: CannonBall » Thu Jul 12, 2007 3:52 pm

WOOOOOOOOOOOO a regulater what an inprovement.. its more easy to work with. nothing more nothing less..
Its not about small copies.. like the sprinkler valve.... but dude to copie a whole gun that's crap
And for propane pressure.. post your cubic inches of your chamber otherwise nobody can calculate...
Measure volume with water..
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Unread postAuthor: spanerman » Thu Jul 12, 2007 3:57 pm

also alot of the sizes are different! i was unawer that, useing the meter tube as a air input aswell was that big of a deal :x and this gun(as sated above) is just to test the meter system as ive never played with hybrid before, for a larger launcher, i liked this congiuration so i emulated it...now please shut up and iff you have nothing constructive to say, dont say anything :x
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Unread postAuthor: CannonBall » Thu Jul 12, 2007 4:03 pm

I did say some thing constructive.. post your chamber volume otherwise a calculation is impossible..
if u wanna tap the plug in buy a tap size m14 x 1.25 otherwise weld
You say to me... say something constructive



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yaay, im starting mine tomoro:)

Like that is a usefull post in my thread....
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Unread postAuthor: spanerman » Thu Jul 12, 2007 4:07 pm

it wasnt destructive was it !! it wasnt an atack on you, it was a meer thanx to the guy above me who helped me out...now please grow up and help if your goin to help...youve made 2 posts in my thread and havent anserd any of my questions now whos making un needed posts??

on the volume front, looks like il have to buy it and find out..
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Unread postAuthor: SpudBlaster15 » Thu Jul 12, 2007 4:12 pm

This is my design almost exactly, which was used by tylerthetatertosser with my permission, and I give spanerman full permission to use it uncredited, so stop bickering at him Cannonball.

Good idea with the regulator. I have been meaning to add one to my setup.

Since your exact volume measurements are not known, I cannot calculate the exact meter pressure you will need, but using an approximation, I have calculated to to be between 15 - 20psi.
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Last edited by SpudBlaster15 on Thu Jul 12, 2007 4:17 pm, edited 1 time in total.
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Unread postAuthor: DYI » Thu Jul 12, 2007 4:13 pm

You said that this hybrid will be all steel. Where do you plan on getting steel fittings? They are never sold at any hardware stores where I live. Hardware stores mostly just sell galvanised malleable iron fittings, which are only rated for 150 psi, although they have been used successfully in many hybrids. Actual steel fittings are rated for either 3000 or 6000psi, and are usually only available from industrial suppliers. The first thing to fail on this design would be the iron fittings, which are only rated for about 1/4 of the pressure that your barrel is. The barrel will probably be fine.
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Unread postAuthor: CannonBall » Thu Jul 12, 2007 4:13 pm

I am helping you cant you see.. if given you the right tap size .. and believe its not easy to find the size or find the tap at all get it at a car depot :wink:
as I sayd give me the chamber volume... im good at calculations 8)
and you dont need a stungun a regular bbg igniter does the job aswell... its saver to 8)
put the spark plug diode at 0.35 that does the job
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Last edited by CannonBall on Thu Jul 12, 2007 4:15 pm, edited 1 time in total.
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Unread postAuthor: spanerman » Thu Jul 12, 2007 4:13 pm

why thank you SB15, very much apriciated, very nice idea btw. what pressure of propane are you useing for every ATM added?
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Unread postAuthor: frankrede » Thu Jul 12, 2007 4:15 pm

4.7%, if you don't know that by now, I sure as hell don't trust you with a hybrid/
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Unread postAuthor: spanerman » Thu Jul 12, 2007 4:16 pm

DYI wrote:You said that this hybrid will be all steel. Where do you plan on getting steel fittings? They are never sold at any hardware stores where I live. Hardware stores mostly just sell galvanised malleable iron fittings, which are only rated for 150 psi, although they have been used successfully in many hybrids. Actual steel fittings are rated for either 3000 or 6000psi, and are usually only available from industrial suppliers. The first thing to fail on this design would be the iron fittings, which are only rated for about 1/4 of the pressure that your barrel is. The barrel will probably be fine.


ive had copper burst at 300psi...and ive tested the malleable iron/steel fittings to over 400....so i belive i will be safe with a 5x mix

Frank..ive never seen butane used only propane...maybe its because its been a year or so since ive made a combustion...or even looked through combustion forums....just to let you know ive made over 8 pneumatics and 4 combustions so i belive that i am redy for a hybrid....

and cannon, im goin to use remote ignition now whicj is hard to do with a BBQ ignitor...
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Unread postAuthor: SpudBlaster15 » Thu Jul 12, 2007 4:21 pm

The galvanised fittings sold at hardware stores are indeed steel, not pure iron, as they contain some amount of carbon and other alloying elements. Even though the steel is not high quality, I have calculated the burst pressure of a 1.25" diameter pipe made of hardware store steel to be over 3000psi.

Frank, the proper propane quantity per atmosphere of air is 4.2%, not 4.7%. For a 4x hybrid, you should inject 16.8% of it's volume in propane.
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Unread postAuthor: spanerman » Thu Jul 12, 2007 4:27 pm

all the parts arew from Pipe Center which is a trade counter in the uk..im pretty sure it isnt soft iron...with any luck il be ordering the ignition..buying the sparkplau..and buying the metering system tomoro
andthe chamber and union next week and the propane, regulator and pressure guage the weekd after:) cant wait....
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