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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: spanerman » Wed Jul 18, 2007 7:48 pm

it needs ptfe, lots of it....
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Unread postAuthor: spanerman » Thu Aug 02, 2007 8:04 am

http://www.ukhybrid.blog.co.uk/

ok all build pictures and updates will be posted there!! but any discusion should be hear!
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Unread postAuthor: dongfang » Fri Aug 03, 2007 3:15 pm

Hi,

Can you really get a spark through that cable? I have always has only fizzles with normal mains cable. Especially when lying on the ground, and/or getting moist.

If it works, great, but otherwise I'd suggest some thick coaxial cable with a solid plastic dielectric. Sometimes the CATV electricians are lazy and just leave their cable scrap behind the distributor boxes etc. That's excellent cable. But even RG-58 cable is OK.

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Soren
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Unread postAuthor: spanerman » Fri Aug 03, 2007 4:15 pm

hi, the sparker i use is from a gas cooker so there is a very low current, the wires used in a cooker are about .5mm in dia....very small, iff you mean the cable from the white project box, that only carries 3v to switch on the sparker situated with the cannon.
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Unread postAuthor: dongfang » Sat Aug 04, 2007 1:02 am

Hi,

OK I understand; the cable just carries 3v supply voltage. Then I'm sure it will work. I thought it was high voltage in it.

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Unread postAuthor: spanerman » Sun Aug 05, 2007 5:19 am

http://ukhybrid.blog.co.uk/ updates with sparker and remote firing that works very well!!

what you think?
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Unread postAuthor: spanerman » Mon Aug 06, 2007 10:08 am

(6/7/07) baught all the fittings today, but missed out a second 11/2 -3/4 socket DOH! il have to go down laiter today or tomoro to pick it up:(

well heres my progress
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Unread postAuthor: spanerman » Tue Aug 07, 2007 12:39 pm

im goin to get a 1 1/2 - 3/4 reducer and a 3/4 -1/2 bush tomoro! and testing will comence!!
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Unread postAuthor: noname » Tue Aug 07, 2007 3:10 pm

SpudBlaster, why would this meter design mix the fuel better than the meter on my hybrid would? The schrader valve and gas input are in pretty much the same places as they are in your meter.
Spanerman, looks pretty good so far.
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Unread postAuthor: spanerman » Tue Aug 07, 2007 3:34 pm

its because the air injection is firther to the end of the meter pipe so the propane will mix more evenly with the air i belive
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Unread postAuthor: SpudBlaster15 » Tue Aug 07, 2007 9:34 pm

noname wrote:SpudBlaster, why would this meter design mix the fuel better than the meter on my hybrid would? The schrader valve and gas input are in pretty much the same places as they are in your meter.
Spanerman, looks pretty good so far.


Your propane meter has a 90 degree bend, then a large volume proceeding that. When you inject air, the propane within this portion of the meter will tend not to mix properly with the air. Sam's design shouldn't have this issue due to the lack of a bend.
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Unread postAuthor: noname » Tue Aug 07, 2007 10:53 pm

Fixed by eliminated the large nipple, the thing is working perfectly.
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Unread postAuthor: spanerman » Wed Aug 08, 2007 3:14 am

nice to know:) if you still feel the need for more meter volume, place the long nipple between the guage and the chamber ball valve.
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Unread postAuthor: spanerman » Wed Aug 08, 2007 4:39 am

ok guys just got my fittings and im testing a normal combustion mix....my meter volume is 70ml and my chamber volume is 308ml i come out with 2.6psi...could someone check this for me please? it doesnt seem to work:(
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Unread postAuthor: noname » Wed Aug 08, 2007 10:07 am

Your meter is huge. Putting in pressures below 10 psi or so is very annooying; you have to be extremely precise. Try to cut down a bunch on meter volume. My chamber is 787 mL, more than twice the size of yours, and your meter is about 3 times the size of mine. Mine's easy, just 20 psi for a normal combustion, 40 psi for 2x, 60 psi for 3x, 80 psi for 4x, and 100 psi for 5x.
I'll edit: My gun doesn't shoot as a normal combustion, it probaly has something to do with the air/fuel not being mixed well enough.
Also, use a small hand pump or something for this gun. A bike pump is too big and too inaccurate. Using a shock pump, it takes about 3 pumps for me to get my gun to 1 psi, so my added atmospheres of air are usually very accurate.
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