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Finding projectiles downrange

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Finding projectiles downrange

Unread postAuthor: deusXmachina » Tue Mar 20, 2007 9:33 pm

I've been designing a very aerodynamic round that is fired out of a 3" barrel with Great Stuff sabots for the purpose of range firing, when I realized something fairly obvious: Getting a range requires retreiving your rounds. And aerodynamic darts have a tendency to be terro-dynamic on impact, burying themselves good and deep. So I was wondering what methods work well for finding rounds after firing them 1/4+ mile.

I've thought about using that orange contractor's twine on the end of it, but it would just bunch up in the hole on impact. And I don't have any RFID readers, although that would be nice ^__^
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:white stuff pours out of piston: "What is that? It looks like milk."
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Unread postAuthor: ShowNoMercy » Tue Mar 20, 2007 9:35 pm

How about something like this http://www.deepskyrocketshop.co.uk/prod ... 3d3914de74 maybe you could modify it so it goes off on impact? I'm sure there are many deviances of that idea out there so good luck.
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Unread postAuthor: c19o » Tue Mar 20, 2007 9:51 pm

Build a GPS receiver into the dart and track it.
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Unread postAuthor: noname » Tue Mar 20, 2007 9:52 pm

For a large projectile, you could have it loaded with low pressure air, a needle, and a burst disc. On impact, the needle would pop the disc and shoot a load of flour up out of the back of the round, which would be sticking up, assuming the round is weighted at the front.
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Unread postAuthor: ShowNoMercy » Tue Mar 20, 2007 9:53 pm

But if he is shooting that far away how will you see a sudden poof of flour ?
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Unread postAuthor: judgment_arms » Tue Mar 20, 2007 10:00 pm

Perhaps a metal detector? Or hire a whole bunch of “cheap labor” guys to scour the field. Or, building on Noname’s idea, instead of flower, hi-visibility paint, chaff, or a coil of caution tape with a weight on one end and tied to the bolt/dart at the other.
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Unread postAuthor: hi » Tue Mar 20, 2007 10:02 pm

If it was clear you could put a glow stick in it. You could mold a wax round (not recommended, mine just fell apart) and put an LED in it. You could tie a string to the round and then tie the other end to your finger (highly not recommended, mainly because you will end up in the hospital)
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Unread postAuthor: ShowNoMercy » Tue Mar 20, 2007 10:03 pm

Or just do some calculations with projectile, windage, energy transferred to it, and angle of shot. That way you could grid your shot target zone if you had a nice liitle topo map and a good sense of math etc. Or borrow a marine artillery officer and ask him to do the math. :wink:
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Unread postAuthor: deusXmachina » Tue Mar 20, 2007 10:03 pm

I really like the audible tracking because I'm too cheap for GPS, and we'll have a spotter nearish to where it should land, but we won't be able to get that close (Bithmuth spike at 100 mph = not cool to be under). Although the flour idea is really creative.

I forget the firearms provisions in New York state but I am pretty sure putting a smokebomb in the projectile would make it illegal...anyone know?
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"On a scale from 1-10, I hope you fall in front of a bus."

:white stuff pours out of piston: "What is that? It looks like milk."
"....<i>Well...</i> it's not milk."

YAAAAAAAAYYYY WE'RE DOOMED!
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Unread postAuthor: noname » Tue Mar 20, 2007 10:10 pm

Flaming and/or incindiary projectiles are illegal, both in the US and on this forum, I suggest you end this idea beofre the trouble starts.
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Unread postAuthor: ShowNoMercy » Tue Mar 20, 2007 10:11 pm

How about dry ice?
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Unread postAuthor: Orpackrat » Tue Mar 20, 2007 11:09 pm

For recovering at night, I would use a high power LED light installed in the rear (providing it is front heavy), during the day I would install a loud chirping device that would chirp (beep) every 10 seconds or so.
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Unread postAuthor: Hotwired » Wed Mar 21, 2007 3:54 am

Just give it a streamer of brightly coloured material. It may bunch up on landing but you'll see exactly where it lands.

A metre or so of bright orange ribbon would do the trick
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Unread postAuthor: joannaardway » Wed Mar 21, 2007 4:28 am

Trailing any string/ribbon will majorly reduce range.

The first thing you should do is calculate an expected range.

The best idea I can give is glow-in-the-dark paint and doing it at night with solid ground.

The other option is dragging a huge tarpulin/similar thin flat sheet over your target area, and then searching for the hole in it.
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Unread postAuthor: Recruit » Wed Mar 21, 2007 8:04 am

Or do the flour idea only it releases a neon colored balloon filled with hellium or hydrogen which ever gas you have you can get your hands.
It hits and you have a balloon floating 1-2 feet off the deck.
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