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Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
I would of tried this today but i do not have any cocktail straws.
my idea: fill the barrel of a large bore, 1 or 2 stage coilgun (due to length,) with small tubes like cocktail straws (stirrer, bar straw, whatever you wanna call them) and put small nails (decapitated) in each one and fire for a shotgun/flechette round-like effect. coil guns are a blast to design and build but they always end up with disappointing results, so why not spice things up with a barrage of projectiles?
Registered Member #2413
Joined: Sat Oct 03 2009, 08:27PM
Location: Essex, UK
Posts: 22
I've thought of trying this myself before, but never bothered because I've always assumed the coupling to the slugs would start to get so poor that you wouldn't manage much more than having all the projectiles just drop out of the end of the barrel.
I have just finished my exams for this year, so I guess I could try this out sometime between now and October, or at least do some calculations...
Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
You could put them in a metal case, with a sort of paper cover over the top, and make it so the end of the barrel has a sort of lip on the inside, so it catches the actual cartridge but not the metal thingies...
Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
Yes, a gun designed solely for this purpose would suffer from coupling losses (unless the coil is very long, in which case the B field would be approximately uniform within.) I just thought it would be a neat thing to try out with an existing coilgun of moderate bore (atleast 30 cal.) Congrats on finishing your exams. Don't waste your time with the calculations, it's just an idea for cool factor, not performance.
Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
Not trying to rain on your parade, but it might not be so easy. A portion of the projectiles will probably get stuck if not shot backward. Variations in the projectiles, non uniform magnetic field, friction and drag are just a few problems off the top of my head.
Come to think of it, when the projectiles are temporary magnetized, wouldnt they repel each other? leading to extra barrel drag?
Registered Member #3792
Joined: Sun Mar 27 2011, 06:07PM
Location:
Posts: 136
Is it possible to put the nails into a ferromagnetic tube, cut along like a sabot, that will be discarded after leaving tne barrel? In that way the nails will maintain the kinetic energy without barrel friction or spreading.
Registered Member #4403
Joined: Sun Feb 12 2012, 10:23PM
Location:
Posts: 7
I think a sabot would be the most eff. compared with the small mass of each flechette-dart, and the full mass of the sabot, holding the darts in a fixed direction, eliminating the need for the few feet of airresistance req.for fins to correct the aerodynamics when leaving the muzzle. I think that the excisting 12 gauge flechette rounds are put together that way, sending away a neatly packed and pointed bundle of darts, eliminating the missing aerodynamics when used in shells or otherwise HE-propelled.
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coil gun flechette
