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Hybrid design

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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Hybrid design

Unread postAuthor: Gunner » Sat Aug 02, 2008 4:12 am

I`m planning to do my first hybrid cannon and I have a few question from it:

I will make 500ml chamber and is this good size: 5cm x 25cm?

And the second question , I am not sure but, must there be is chamber fan?

Thanks!
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Unread postAuthor: CasinoVanart » Sat Aug 02, 2008 4:33 am

You may want to do a bit of research first Gunner, start with the Hybrid showcase.
May i ask what types of cannons you have built before?

And no, no fan.
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Unread postAuthor: Gunner » Sat Aug 02, 2008 5:01 am

Combustion cannons and pneumatics...and I have done some research but I have not found yet what I am looking for.
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Unread postAuthor: Gunner » Tue Aug 05, 2008 12:10 pm

Hmm, I made my chamber, it is 3cm ID and 20cm long and it is about 150ml and I am planning to use 6x mixes, Is the DDT how possible?
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Unread postAuthor: Hubb » Tue Aug 05, 2008 12:13 pm

DDT is very possible with that. I've never experienced DDT (not intentionally) but the research I've done suggests that a long, thin chamber is more prone to DDT than a short, fat one. What OD is the chamber?
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Unread postAuthor: brogdenlaxmiddie » Tue Aug 05, 2008 12:14 pm

In this case, I wouldn't be worried about DDT. I would be more worried if your chamber could even take the pressures of a hybrid. You mentioned the diameter and length, but not material. I also don't neccisarrily believe that you should be making a hybrid quite yet. If you were, you wouldn't of asked these questions. However, it is nice that you did ask because that shows you at least care. :wink:
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Unread postAuthor: Gunner » Tue Aug 05, 2008 12:48 pm

Here is the chamber and the ignition box: http://www.aijaa.com/v.php?i=2470935.jpg

The chamber ID is 30mm and OD 32mm and I think that you can quess what material it is :D
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Unread postAuthor: SpudFarm » Tue Aug 05, 2008 1:19 pm

do not put 6x in that thing, the soldering looks bad..
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Unread postAuthor: bob-a-lu » Tue Aug 05, 2008 2:22 pm

i agree with spud farm and u dont need a fan because the fuels pressurated
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Unread postAuthor: SpudFarm » Tue Aug 05, 2008 2:28 pm

not because the fuel is under pressure more because it will be mixed with the incomming air and the shot wont go until the disk burst's what so ever
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Unread postAuthor: Gunner » Wed Aug 06, 2008 2:28 am

Well , I will start with 2x mixes and then 3x and... but I put with my 12V compressor 18bar in that and after one hour the pressure was still same :).
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Unread postAuthor: SpudFarm » Wed Aug 06, 2008 11:16 am

6x would be more like 40bar
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Unread postAuthor: Gunner » Wed Aug 06, 2008 12:48 pm

Yeah I know but now some edit:

I made three shots without barrel: 1x,2x,3x and then it fired every time and the sound... it was like shotgun :D . I will soon buy the barrel and then the fun begins :twisted: .

Here is pic: http://www.aijaa.com/v.php?i=2476912.jpg
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Unread postAuthor: SpudFarm » Wed Aug 06, 2008 1:08 pm

i would not go over 4x..

but congratts, you made a hybrid :)
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Unread postAuthor: Gunner » Wed Aug 06, 2008 2:09 pm

How possible the DDT would be in 6x? :D
(I am not trying...yet)
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