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High Speed Camera Projectile for Spudgun

A place to ask general spud cannon related questions.
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Unread postAuthor: dewey-1 » Fri Apr 04, 2008 11:43 am

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Last edited by dewey-1 on Sun Apr 20, 2008 11:55 am, edited 1 time in total.
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Unread postAuthor: sniper hero » Fri Apr 04, 2008 11:46 am

sounds cool but are you going to use a parachute ?
I really want to see video of this ! :D
so just search for more idea's
and I wish you a lot of good luck :P
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Unread postAuthor: Lentamentalisk » Fri Apr 04, 2008 12:24 pm

First of all, it would need to be shot from a pneumatic with multiple valves, all timed slightly off, and a very very long barrel, because the acceleration of your standard cannon is enough to damage or turn off any electronic device that you shoot.
Flying through the air you would be fine, so long as you had spring fins or at leased balanced the COG and COP (center of pressure and gravity) so that It was stable in flight (ie: hollow tail.)
Then you have to deal with the landing, which is if anything, more sudden than the firing. I would suggest an altimeter, and an ejection charge, like they use in high power model rocketry. Go search Model Rocket Altimeters and you will see what I mean. Get your self on a model rocket forum and ask them how to use it along with an ejection charge. Or if you are really good at math, you could just program a 555 timer and get it to eject at the apogee.

This is the kind of thing that model rocket makers do all the time. I really suggest that you talk to them about it.
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Unread postAuthor: THUNDERLORD » Fri Apr 04, 2008 1:27 pm

Looks like a cool concept.
Your camera would probably have to do freeze frames, because it will spin. Or it would need some kind of gyroscopic stabilizer for the camera. If it's only transmitting 300ft/100yd.s ,you might as well just attach the camera to a balloon full of lighter than air gas though.
One way to make parachutes is out of old umbrellas.
I am always finding broken umbrellas near trash cans when it rains and I just pull the nylon part off and save them for parachutes.
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Unread postAuthor: Grizzlybear » Fri Apr 04, 2008 1:40 pm

It actually sound good but how do you think it can land ? With parachute or something ???[/url]
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Unread postAuthor: scottcrete » Fri Apr 04, 2008 2:13 pm

im guessing all of you dont read the posts? just look at pictures?
anyways.. yah... but what i was thinkin about two.. is buying one of those little cameras that come with model rockets that take 110 film.. ever seen one? that might work.. walmart sells these.
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Unread postAuthor: Jared Haehnel » Fri Apr 04, 2008 2:19 pm

I've see them and it should work just fine though I don't know how it all works or how it will hold up on the landing... or even how everything thing is triggered...
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Unread postAuthor: potatoflinger » Fri Apr 04, 2008 2:31 pm

I think you should use the camera that you already have, since there is no transmission range that you have to worry about.

Also, the umbrella parachute was a good idea, you could take a whole umbrella and stuff it down the barrel so that the top of it is closest to the muzzle of the gun, then have the camera attached to the top of the umbrella. If you did that, the wind resistance would keep the umbrella closed (depending on how strong the spring is) but then after it slowed down enough the umbrella would be able to open and would make a perfect parachute.
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Unread postAuthor: scottcrete » Fri Apr 04, 2008 7:51 pm

true.. unless the umbrella went upside down.. then look out below.
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Unread postAuthor: Lentamentalisk » Sat Apr 05, 2008 2:20 am

or, you could use a parachute... Those cameras are expensive, so it is worth making a good parachute. Like I said before, look on model rocketry sites to see how they make their parachutes and deployment systems. They are far more reliable and will slow the fall far more than an umbrella, which is what they call in the model rocketry groups, a para-sheet (flat as hell, so holds next to no air,) not a parachute.
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Unread postAuthor: Carlman » Sat Apr 05, 2008 11:53 am

some interesting ponts about G forces and such on the camera in this thread.

http://www.spudfiles.com/forums/working-designs-for-parachute-ammo-with-a-difference-t11990.html
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Unread postAuthor: D_Hall » Sat Apr 12, 2008 11:50 am

Hardening electronics for the kind of G forces experienced in your typical spud gun is pretty trivial. Hell, it's been done for real guns since the 1950s if not earlier (see, HARP gun).

That said.... I don't think you're going to see anything beyond a Big Blur with a cheap camera.

And a high speed camera? Puhlease. As as already been mentioned in this thread....

1) They're expensive. We have a half dozen or so at the office. Costs are anywhere from $50,000 to $150,000 depending upon what you buy.

2) They're big. Sort of... The cameras themselves aren't very big (call it a 6" cube), but by themselves the cameras have no way to store or transmit images. Yup, you need a RAID pack right next to 'em to store the data. Those tend to be 12" cubes or so..... And they're not "normal" in that they're specially built to handle insane data rates. Cost? Call it another $25k.
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