New exploding 40mm Concept

[Brian McIlmoyle]

Originally Posted by DarkAngel

Lol, forgetting Z4 Brian? XD
The amount of nades we chewed through in every direction while on the run, Duckman would be still be crying for the next few weeks.

Well you see .. no one is talking about replacing the shower type with the launchable type..

you would ADD this type to your loadout..

In the application we used the shower grenades for .. the launchable type would not apply.. they are not for shooting AT people.

Where would the launchable grenade shine? shooting one through a window into a room ... shooting one into a wall above somone behind hard cover

Lobing one over a berm for an indirect fire application..

[deep in the bush]

Originally Posted by Brian McIlmoyle

Well you see .. no one is talking about replacing the shower type with the launchable type..

you would ADD this type to your loadout..

In the application we used the shower grenades for .. the launchable type would not apply.. they are not for shooting AT people.

Where would the launchable grenade shine? shooting one through a window into a room ... shooting one into a wall above somone behind hard cover

Lobing one over a berm for an indirect fire application..

Moving troop carriers etc too

I was thinking thou, do you need to have the propellant in the rocket/gernade? check out these to see it they can generate enough force for you

XM995 Foam Rocket Slug Shot

http://www.madbullairsoft.com/Englis...products_id=15

This doo hickey has a long cylinder inside you can place the rocket/gernade on. I know it will blow up a foam rocket to pieces with CO2. (I have blown up my supply )

[DarkAngel]

Fair enough lol, to each his/her own.

[SHÖCK]

Good luck with this, I hope this works better than your corn starch mouse-trap claymore although it was pretty funny that one game.

[Kimbo]

I would love to see this work, but in my opinion it`s going to be tough.

The mass of the projectile is going to have to be very small. I`ve done quite a bit of testing as I have a few AT-4 launchers (one Zero Delay built one and 2 that Ive made myself). I use the nerf 2 inch vortex rounds and to get usable range (150-200 feet) they need to whack out at least 150 fps. They don`t weigh much and the FPS doesn`t sound so bad until you take one at point blank range. They hurt quite a bit, so It`s getting close to the threshold for safety in my mind. Add to that a bunch of bb`s and the required matrix to hold and distribute air and your wieght is going to add up quickly. The only way that you will be able to remediate this is to limit the usable range at which this will be used.

Getting a good dispersion of bbs, usable enough to be useful may also be an issue. To fit in a 40mm launcher, everything is going to have to be super small. This means at low pressures (a requirement of using super light materials) bb dispersion will be low as well.

What you could do is try and prove if the physics of the warhead would work with your design. If you took a heavy duty plastic bag and made an air chamber that`s 40mm by say 60mm, sealed the end around a straw, filled the straw with a few bb`s then whacked it on a table. How fast do the bb`s come out? Will the bag burst or hold the pressure long enough to vent it out the straw? Will the seal on the straw vent the pressure before it transfers the energy to the bb`s? Going further, and assuming you`d make the bb manifold out of foam, will it have enough mechanical strength to contain the pressure long enough to disperse the bb`s? I think it will be too small of an area and you`d need to use to heavy of material to make it viable.

Just use a regular nerf round. We`ve played quite a few times now where we use them for vehicles or small buildings. If either get`s hit, you`re out. It`s simple and you won`t cry when you lose one of your creations. I get miffed enough when we lose nerf rounds at 3-4 bucks a piece.

In the end I think you`d be way better off doing a mechnical type design which wouldn`t require complicated pressure distribution. Have a plunger that fit`s inside a sleeve that whacks the bb`s out as it compresses or something along that line.

Again, I`d love to see it work, but I see it as a hard thing to do and keep safe enough to be used in a game. If you do get something happening and you want something to launch test with, PM me and I`ll loan you one of my AT4`s for a bit.

[bananabotdan]

Thanks both Shock and Kimbo for the local shout out from JOC. I will take all of your suggestions into consideration and I will definitely try the table smack test. Perhaps I will try a hand throw test with my first prototype as well to see if this idea is even feasible. once again thank you for the valued input. I hope to make the grenades a hi vis color if this all works out. Any ideas for a study yet collapsable material kind of like inner tube rubber?

[Kimbo]

try the stuff that you dip tool handles into to put a rubber grip on. I remember they used to sell it at Canadian Tire. If you did a quick coat on the conical end of a plastic bag that may make a nice cone shaped ruggedized bag. Maybe also theatrical latex. Never worked with it before, but may be worth taking a look at.

[bananabotdan]

Originally Posted by Kimbo

try the stuff that you dip tool handles into to put a rubber grip on. I remember they used to sell it at Canadian Tire. If you did a quick coat on the conical end of a plastic bag that may make a nice cone shaped ruggedized bag. Maybe also theatrical latex. Never worked with it before, but may be worth taking a look at.

I have looked into liquid latex but it is EXTREMELY impractical, to get the thickness I want I would have to apply over 15 layers @ 1 hour drying time per layer. Needles to say it is not a time smart material. I have also looked at pool liner repair liquid rubber and it shows some promise. The pool cue thing I will defiantly check out I have never heard of the stuff before. I plan on using a lathe cut positive as a form to increase the precision of the molding of the liquid rubber.

[R.I.T.Z]

i looked at the grenade and all the comments, and i'm sorry if i missed it but it seems to me that all the ports from where the BB's will be launchered are straight, which means that they won't be shooting out to the rear at all... i was thinking maybe you could employ a angle into them.

sorry for the bad photo but i think it explains my idea

[Watase]

I realize that this thread is a few months old.. But I was reading it, and I had an idea.

Has anyone ever thought of using one of the Madbull style shotgun shells as the propellent 'unit' inside of the grenade? They should have a small enough diameter to fit inside of a 40mm shell (therefore giving space around it for containment(due to pressures involved) as well as padding around it for safety).

More or less have a soft front to it, that when depressed enough, triggers the release on the shotgun shell, which in turn would cause the BB's to fly out?

Realistically, it would be best to get the shell to spin if possible (such as a Tornado grenade) to maximize BB dispersement.

This type of grenade would obviously require a bit more in the way of design, due to the shotgun shells pressure output, but the weight should be fairly low, everything considered.

The cost could be fairly low as well, the shells (Maruzen ones anyway) would only come out to be about $6 each, so everything factored in, I don't see why these couldn't be built fairly cheap.

Anyway, just an idea.

[Luujerr]

Originally Posted by Kimbo

In the end I think you`d be way better off doing a mechnical type design which wouldn`t require complicated pressure distribution. Have a plunger that fit`s inside a sleeve that whacks the bb`s out as it compresses or something along that line.

i took a look at this plunger comment and i was thinking gearboxes... if you had a spring and piston type thing going on... maybe? for example, the spring guide would be in the nerf foam head of the grenade with the spring and piston compressed inside the head. a latch holds the piston and releases on contact. (i was thinking that might lessen some of the force on impact with the rear firing piston assuming you had a sensitive latch/firing mechanism) and along the length of the cylinder are exit ports for each bb barrel...

most likely too heavy but its a different idea?

EDIT: now that i think about it, it'd lose pressure way too quickly with multiple ports anyway... eh, i tried lol

[GBear]

With a solenoid, you can basically almost make that into a rail gun. o.o

[BlackCoffee]

not to bet a dead thread, but: YouTube - Lanard Scatter Blast - Demo & Test Fire

perhaps a little reverse engineering is in order?

[DarkAngel]

YouTube - The Great Office War

[ThunderCactus]

Using my amazing super Machinist skills, I've remodeled my M203 with something a little more deliberate....
Any of you able to make it out to coldfront 3 will get to check it out first hand