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"yankee spirit" full auto/semi cartridge hybrid

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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"yankee spirit" full auto/semi cartridge hybrid

Unread postAuthor: nitrogigi » Wed Nov 21, 2012 6:41 am

Hi!
My project is now mature enough so that I can let you know about it:

generalities:
caliber : 6mm airsoft aluminium BB
canon length : about 550 mm
cartridge internal dimensions :
- diameter : 14mm
-length : 45mm
mix: 6 to 10
ignition : scooter ignition coil
expected performances : 365m/s 22 Joules

a picture of the 3D model (not finished):
Image


Electrical sketches with two options (with or without reed switch):
Image

Image
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Unread postAuthor: sagthegreat » Wed Nov 21, 2012 10:52 am

i like this, but how will the cartrige eject, because he magnet pulls it, but there is not force pushing it up and out?

Looking forwards to see this happen
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Unread postAuthor: nitrogigi » Wed Nov 21, 2012 1:06 pm

here you can see the key in grey, wich would eject the cartridge:
when the cartridge rushs back with the blow-back pressure, it will hit the key, rotate, and eject
the magnet is just here to pull back the cartridge in case of misfire, you must pull back quickly the lever so that the cartridge hit the key and eject

Image
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Unread postAuthor: sagthegreat » Wed Nov 21, 2012 1:08 pm

niceee, what will the cartriges be made of, try to take it to 200x mixes :P
that thing would pwn

(jk, dont go 200x without the proper steel, and recoil systems)
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Unread postAuthor: nitrogigi » Wed Nov 21, 2012 1:26 pm

Image

all is on the picture

the mix would be between 6 and 10
I hope getting to supersonic muzzle speed with 0,3g aluminium BB for airsoft, HGDT gave me results up to 380m/s
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Unread postAuthor: dewey-1 » Wed Nov 21, 2012 3:21 pm

What is the material that is blue surrounding the brass tubing on the cartridge?

On your schematics I have a few concerns.

1) Reed switches do not have a high current rating that the coil primary requires.
2) You will want to have your "safety switch" at the coil primary +.
3) Do not try to "switch" the HV lead from the coil.

Conceptually it looks good but it will require some electro/mechanical refinements.
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Unread postAuthor: nitrogigi » Wed Nov 21, 2012 3:25 pm

what is HV?
the blue is only the background color
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Unread postAuthor: dewey-1 » Wed Nov 21, 2012 3:32 pm

nitrogigi wrote:what is HV?
the blue is only the background color


HV is "High Voltage" abbreviation.
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Unread postAuthor: nitrogigi » Wed Nov 21, 2012 4:14 pm

I found a special switch for HV, that is able to switch up to 100 000 volts but, I won't try such a madness, I don't want to get 35000 Volts in my fingers

I wont put a reed because I didn't find a form B one
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Unread postAuthor: jackssmirkingrevenge » Thu Nov 22, 2012 1:51 am

Looks good, what I've always wanted to make but never bothered :) Selecting the correct material for the seal is crucial if you want it to hold 150 psi of pre-ignition pressure.
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Unread postAuthor: nitrogigi » Thu Nov 22, 2012 3:21 am

the inner of the brass would be scratched so that the epoxy can be well held
I'll maybe replace it by glass fiber charged resin

finally I won't hold the BB with a rubber tube, I'll put a screwed "inner barrel" to be able to put a burst disk, because I want it to hold about 40 atm as pre-ignition pressure
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Unread postAuthor: jackssmirkingrevenge » Thu Nov 22, 2012 3:40 am

nitrogigi wrote:I'll maybe replace it by glass fiber charged resin


Not really necessary for an endcap, fibres are more useful when you have a thin sheet.
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Unread postAuthor: nitrogigi » Thu Nov 22, 2012 4:03 am

it a resin with very short fibers mixed in it that improve the cohesion of the resin. I've already a pot of it, and I have to use it quickly so.....
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Unread postAuthor: sagthegreat » Thu Nov 22, 2012 9:03 am

this is going to be great :D
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Unread postAuthor: nitrogigi » Thu Nov 22, 2012 6:01 pm

I maid a simualtion with solidworks, with mix10 and a burst disk holding 30 atm. It gave me a fire rate between 250 and 500 shots per minute, depending of the friction and of the spring stiffness :D
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