Deep Fire M72A2

Price is high but what a sweet prop. There are videos attached to the link. Uses M203 shells to fire a nerf ball. Some good ideas to steal from and make our own!

Length: (extended) 918mm
Length: (closed) 655mm
Weight: 3.5kg
Caliber: 57mm Nerf Ball
Capacity : 1



http://www.redwolfairsoft.com/redwolf/airsoft/ProductDetail?prodID=21874

Yeah, that is a cool design, I just really think that nerf balls are lame, stick to peas!!! That and M203 shells are expensive and usually very weak in power, XM shells included. I think that our existing cannons could just use a face lift and a re-tool and we would have something that cosmetically could be similar but be 10x more effective!



This is what I was aiming to complete with my C02 bazooka. Though I have nearly all the pieces for this, I am not back in PG where it all sits. Very simple design and function. You screw the bottle in, pop the cover and let some c02 in (much like adjusting your hop-up), get to required PSI, place in sabot, press button to fire.

I will probably add an additional switch on the inside to prevent mis-fire.

The 20oz bottle will provide plenty of very quick refills, though more expensive than air pumps, it really is faster, allowing multiple shots per minute.

The bottle attaches to the standard PB bottle valve which has 1/8 inch fittings. These fittings go to the mid-chamber allowing you to regulate PSI (originally was going to use bottle side regulator but they are not too consistant). Once filled, you close the valve. This means the bazooka is ready to fire. You place a sabot down the barrel, be it peas in a bag, or a nerf thingy. I have two solenoids to use, a 100psi sprinkler valve, or a 250psi hydraulic solenoid. Both work well, just I will use the hydraulic one due to the smaller size. Once you are loaded, you aim and fire.

Now, this will require some practice and safety training. Low PSI for CQB, high PSI for ranged fields. Different sabots for different events (nerf for vehicles, peas for everything else). A well trained crew can probably get at least 6 shots off a minute, which considering how many peas or bb's will be in the air, is rather frightening.

So, if I get back to PG anytime soon, I will make sure to throw this together. I am still looking for some more piping, donations welcomed.

-Doug

who uses a bazooka in CQB? Just run around and call mercy hits.

Great looking specs Doug, can't wait until you get back into town. I am still trying to figure out a good system for using those little CO2 cartridges that puncture. We'll have to do some building when you are in town again.

what is the estimated length of that thing?

Hortons Heros wrote:

what is the estimated length of that thing?

ummm, not really CQB length At least we know with peas that it is relatively safe up close.

Depends on what I can get for cheap materials. There are some nice drainage pipes that will fit everything but they are a little too big around. I am hoping for around 4 feet length.

I hate those little powerlets, they are too expensive and you only get one shot per cartridge. Ideally would be using those HPA bottles at 4000psi and dialing them down, you could potentially get many many dozens of shots. Using the 20oz bottle I have, and shooting at a realistic PSI, you could get a few dozen shots off from one botttle.

An alternative to this is to have many launchers and one guy with a bottle to fill them all, get some crew/squad training to do it. I have already used the C02 to quick fill my existing cannon and it works VERY fast. If you made a ton of premade pea sabbots and have a huge pack full, a bazooka squad would be incredibly devastating, fast firing with lots of shots. Of course, this could be used by one person but you would be lucky to get 3 shots per minute.

It would be nice to get the cannons up again and/or make some bazookas and launchers. They are great for props and add an extra dimension to the game play. They are also great when restricted and make them the objective of a game, ie get the cannon and shoot a base. This design is for game play, ment to be effective in actual combat, but our existing one-shot cannons do make great objective cannons still (we have used them in a few games under these context). If I have spare piping left, maybe we can give our existing cannons a face lift too.

-Doug

it takes a huge area to use those cannons. Allot of prep just to get them ready to go and if you lug those beasts through the bush then the shot you get had better be worth it.

Even when we were just using tennis balls to take out vehicles it took allot of time to prep a good enough ambush to take anything out. Those games when Spork was out were great. It would even more gun to have no idea if and when they are being used though. We were just waiting for them to go off when we played at the top of busters.

Daes, with that M72 CGI, you should install the same solenoid valve between your "midway" (expansion) chamber, and storage tank as well as use a trigger switch with both normally open and normally closed contacts.

Use the normally open contacts for the forward solenoid to fire the projectile, and the switch will open the normally closed contacts and close the rear valve to prevent you from dumping excessive amounts of gas each time you fire. Basically, you are only using the amount of gas present in the midway chamber.

When you release the switch, the front valve will close and the rear valve will open, recharging the chamber. You can also install a "safety" toggle switch (just like on the real one) to de-energize the system and prevent the rear solenoid from being energized for long periods of time, eliminating any potential damage to the solenoid and battery drain as well.

Just a thought.

macguyver wrote:

Daes, with that M72 CGI, you should install the same solenoid valve between your "midway" (expansion) chamber, and storage tank as well as use a trigger switch with both normally open and normally closed contacts.

Use the normally open contacts for the forward solenoid to fire the projectile, and the switch will open the normally closed contacts and close the rear valve to prevent you from dumping excessive amounts of gas each time you fire. Basically, you are only using the amount of gas present in the midway chamber.

When you release the switch, the front valve will close and the rear valve will open, recharging the chamber. You can also install a "safety" toggle switch (just like on the real one) to de-energize the system and prevent the rear solenoid from being energized for long periods of time, eliminating any potential damage to the solenoid and battery drain as well.

Just a thought.

What you have said is what I originally had in mind (mind you, I hadn't thought of doing that rocker electrical system between the two, great idea!)

Yeah, I have already tried a bottle side solenoid (one to charge, one to fire), unfortunately I am having a hell of a time getting one that can take 600+psi. Even with the hydraulic one that can take a beating, I get some nasty leakage. I tried it with a bottle side regulator, limiting it to 200psi, but I can not justify putting a $120 regulator in the cannon (that and it does not do 200psi that well, tends to stutter). The way it is set up now, the mechanical valve can hanndle the bottle pressure and the solenoid can handle the mid-chamber pressure.

If you can find a solenoid (or diaphram, I don't mind mechanical) that can handle 600+ psi and is in Canada, please let me know, I would greatly appreciate it! I have had absolutely no luck in PG and on the internet, only things I found were seltzer bottle regulators and solenoids.

-Doug

Hey Dave, if you want to do a conversion over to those cartridges it is not too difficult.



All you have is a screw on chamber that has something that pierces the seal upon the lid being screwed on. The size difference between the mid chamber and capsule should give you ~200PSI which some solenoids can handle. It is worth a try if you have an abundant supply of them catridges.

The design with the 12g is the same as what Zerodelay did for his AT-4 for Keystone Strike 2.5 last year. They work well.

macguyver wrote:

The design with the 12g is the same as what Zerodelay did for his AT-4 for Keystone Strike 2.5 last year. They work well.

heh heh, you are on the dot, that is where I got it from. His videos turned out really well, the PSI behind it was insane. Me, I want something that can be fired as rapidly as possible, not so realistic perhaps, might be better adapted as a mortor (drop shell, fire, repeat).

Still, Zero Delay has great ideas and the motive to make them, I really like his sabot ideas:

Awh heck, skip the bottle or what not, guess one could just use these on our old cannons (thanks to ZD again). Thought about it before but couldn't justify the $60 price tag for one of these suckers, now, in hind sight, that is not too bad.

-Doug

Well, since my camera cord was "borrowed" by my Dad I am stuck with the webcam. This is the existing system that fills within ~1 second. The shots are shell loaded and work well with the C02. Only problem is that the C02 makes the gun kind of cold.





It is nice to be back in PG with my shop, shame that I am flat broke and stuck using what junk I have lying around. If anyone has scrap materials/piping they do not want, I glady take donations.

-Doug

who's that pretty boy behind the tank?

I don't know but if you want to buy some time with him, I am sure I can arrange something. Cash up front!

-Doug

anything i want?

I heard he is pretty flexible, in a good way too.