Technical challenge

[Silverstalker]

To be honest the air soft in the heng long is not very good. and brakes 'alot'

I got one of these http://www.google.co.uk/imgres?hl=en&sa ... 1,s:0,i:82 from ebay in the aim to beef it up some what...

I have tested the unit and can get a good swift burst of Co2 with just a tap on the trigger ... but i need a way to to make it fire a birst of Co2 fast enough and just once for a single good powerd shot..

What I dont want is for it to end up on a cam or something and make it rappid fire as fun as it sounds I may end up with a load of buck shot flying out the end

So a quick burst is what i need...Any ideas Maybe adapt the air sof mech some how

Cheers guys

[Dietrich]

Hi Silverstalker,
The 'CO2 conundrum'........it has reared its head a few times over the years .....the 'gun' system is used by the R/C Battleship groups who build large scale model warships which are fairly good approximations of the ship that they are modeled after....BUT.....with a big difference. The main heart of the model ,so the R/C gear the batteries and the motors are built into water-tight and 'Hardened' pods...but the rest of the ship although built onto a very tough skeleton is only built of light balsa wood or plasti-card....so that it can be deliberately pierced by the steel BBs that they shoot at each other with CO2 powered , automatic yes AUTOMATIC cannons that fire the steel BBs like a machine gun. Its on YouTube and they are amazing !!
You are allowed a 'bilge-pump' of a certain capacity but inevitably you end up with more holes letting the water in than the pump can get out and so they literally do 'Sink' . They often try to get to the shallows to be easier to 'rescue'...but the 'Old Die-Hards' fight it out. when they sink a portion of the superstructure floats free and is tethered to the hull so that the ships can be found later and recovered for repairing to fight again. The CO2 cannons can be arranged in groups of 3 and are restricted in power so that they cannot, 'Pierce Human Skin' but EVERYONE wears eye guards....guess why ?...
Look at this..........awesome stuff and look at the bilge,pumps....spraying up...... the phut phut phut that you can hear are the guns spraying the BB's and you can see hits with the water splash......I believe that at 2.04 minutes a combatant who refuses to surrender quotes 'Grounds-keeper Willey' from the Simpsons.....You will know it when you hear it.......
.
http://www.youtube.com/watch?v=wvugEmj3 ... re=related
.
I think that the guns are called 'Arizona Cannons' but the firing mechanisms are quite large and complicated.....Ideal for a 1/16th model of the German 'Ratte' or a 1/6th scale model...
Alb.

[Silverstalker]

Neat stuff and the way they just sink like that!... I think i have worked out a simple way to do it... I need to tinker about with some parts etc but have come up with an idea, more to come

[Silverstalker]

almost cracked this...Only had about 10 mins a day to work on this...but getting to a very easy mod to make this work

[Silverstalker]

Ok using the standard mech from the HL air soft.. I took all the gears out and rearanged them in such a way that it had plenty of torque but just the right speed to trigger a good ration of Co2..

please forgive the mock up its a proof of concept... and glad to say it works 'quite well' ...

I elected for plastic BB.s @ 6mm and use a 6.5 mm bore on the barrel.... but i may go down to 4.5mm steel BBs with 5 mm bore...not sure yet??



It basicly runs off a cam the triggers the trigger and POW! Co2..

I need to come up with a reload mech yet. I have one or two ideas but nothing set in stone... what i dont want is alod of BB's thrown down the tube and end up with a Co2 powerd shot gun bulldog tank

[Silverstalker]

I cracked it!! I have Co2 smooth bore madness..... Its emensely powerfull, only getting 10 good shots from one Co2 capsule. so a small tweek to power it back a bit and get more shots out of it

I ended up with 6mm plastic BBs steel would have been an urban health and safty nightmare not matter how cool it could have been.. the plastic ones are still 'quite kinetic' shall we say

Here is a few shots of the whole thing broken down just to get it running.. I have to some how make it all fit in there at some point too


the set up is quite simple, the hard part was the trigger system... but a few well aranged gears from the air soft unit worked great

I need to make another elivation system and the old one not longerfits/works..
the hole is 6.1mm with a rubber back stop.. I need to make a hopper to dispence the BB,s evenly and consitant and more importantly 'one at a time', I dont wan no shot gun tank?? or do I





The whole coversion cost no more than a £15 .......Worth it

[Silverstalker]

Stuck been playng about with delivery system... but cant get it to work... as one bb falls into the hole it gets shaken about by tank movement and a whole bunch fall into the hole and end up with shot gun action.... any ideas please guys on a one bb at a time deleivery??

[FreakyDude]

have a geared circular wheel with a hole the size of a BB. Small 3 volt motor could turn that.
As it turns the BB will drop through the disc into the barrell.
you could fill a tube the size of one BB and have the bb's run down the tube, i don't think you want it too to be like a feeder where it is a pot full of bb's, too many will jam up. you want this more of a precision feeder. the size of the geared circular disc would limit the reload time.

Come to think of it, find a way to keep the pressure and you could use the rotating disc as your quick blast of CO2, just use a very small hole for it to go through. Question is can you get the disc to hold the CO2 pressure in the cylinder.


You will need more space so you might need to move up one notch in size to make it work.

[Silverstalker]

I like the disc idea...... Very simple,

to try use a bit of gas is a good idea to... Just making it all happen is hard bit lol....


I was going for a hopper that dispenses one in to the barrel.. Then. inside the barrel have a thin shim that is just enough to keep it in place but not so that the co2 wont be able to push it out.... I tryed this but problem is the inconsistent sizes of bb means that some drop through some stay in place and some get stuck?...

[jonger]

I tryed this but problem is the inconsistent sizes of bb means that some drop through some stay in place and some get stuck?...

Don't use the Heng Long BB's they are poor quality, get some heavier .20g polished BB's that the skirmishers use and they are much more consistent in size so should eliminate that problem.