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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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Unread postAuthor: SpudBlaster15 » Wed Aug 08, 2007 11:36 am

Bike pumps work fine, if you have an accurate pressure gauge. Pumping 135 times with a shock pump just to get to 45psi would be extremely annoying when it can be done in less than 5 pumps using a bike pump.

My meter design is optimized for 4x and above mixes. This is why you are having problems. Normal combustion, give me a break. I've never fired my hybrid at a mix lower than 4x, there is no point in doing so.
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Unread postAuthor: noname » Wed Aug 08, 2007 2:07 pm

My bike pump has a perfectly accurate pressure guage, the only problem is that it pumps in too much air at once. Let's say I'm at 43 psi. If I pumped once, it would go to around 47 or 48 psi, so the fuel wouldn't ignite.
I also don't understand why you have another ball valve in front of the schrader valve. Seems pointless.
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Unread postAuthor: SpudBlaster15 » Wed Aug 08, 2007 2:29 pm

Then use half of a pump. It isn't difficult to achieve the proper pressure with a bike pump. I should know, because I have fired my hybrid over 50 times without issue.

When the launcher is fueled with 18.4% MAPP gas, the pressure in the meter and chamber rises to ~3psi. The ball valve prevents this pressure from being lost when connecting the air source to the schrader valve.
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Unread postAuthor: noname » Wed Aug 08, 2007 2:40 pm

Ha! Another reason to use a shock pump! Mine is female threaded, so it screws onto a schrader valve, and no pressure is lost.
Well, I probably wouldn't have added the extra ball valve anyways, I'd probably just hope it worked anyway. :D
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Unread postAuthor: SpudBlaster15 » Wed Aug 08, 2007 3:08 pm

I think the best option would be to use a bike pump to get the pressure up to the vicinity of the requirement, then use a shock pump to top it off to the exact pressure.
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Unread postAuthor: noname » Wed Aug 08, 2007 3:11 pm

Yeah, that's what I'm thinking about doing, because my shock pump got really hot from all the pumping when I shot about 20 times in less than an hour.
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Unread postAuthor: spanerman » Thu Aug 09, 2007 10:11 am

ok kool, what pressure should i use for 4x and what material for burst disk? just to check.........oh and btw ive redone the meter and the new volume is 40ml....better?
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Unread postAuthor: SpudBlaster15 » Thu Aug 09, 2007 11:34 am

You should be using approximately 21.5psi for a 4x mix.

For burst disks, milk jugs work well.
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Unread postAuthor: noname » Thu Aug 09, 2007 12:02 pm

Hmm, I haven't tried milk jugs. What mix do they burst at? Would they burst at 3x? I've only been using soda cans so far. Haven't stepped up to a double layer of soda cans, but a 4x should should burst that. Would one of you guys with remote ignition try that for me?
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Unread postAuthor: spanerman » Thu Aug 09, 2007 1:30 pm

ok peeps tried that......not good news...no booms so far:(

well hers pics of the setup now...
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Unread postAuthor: spanerman » Thu Aug 09, 2007 2:13 pm

SB15 and noname, I LOVE YOU!!! i just shot 4 4xmix in a row...oh my lord its loud!! damage pics to come!!
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Unread postAuthor: noname » Thu Aug 09, 2007 3:40 pm

Why me? He's the one that helped you the most. I just said what worked for me.
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Unread postAuthor: spanerman » Thu Aug 09, 2007 3:45 pm

hehe woops....you obv dont love me back:P, im sure SB15 willlreturn my love LOL, anyway thanks again guys....time for mwhaha
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Unread postAuthor: SpudBlaster15 » Thu Aug 09, 2007 4:51 pm

I love you too spaner. :lol:
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Unread postAuthor: spanerman » Thu Aug 09, 2007 4:52 pm

lmao.....no-one ever speak of this again :P
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