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spudgun range, are we falling short?

A place to ask general spud cannon related questions.
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Unread postAuthor: POLAND_SPUD » Sat May 19, 2012 12:51 pm

ohh now you're an electronics expert :D you even know what a capacitor is

they launched cameras from spudguns so I guess a pressure sensor can handle it
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Unread postAuthor: jackssmirkingrevenge » Sat May 19, 2012 1:28 pm

I'm the first to admit that electronics is not my forte, but I do have a fairly good grasp of Newtonian physics, which is what we're talking about here ;)

Even a simple sliding switch can be a problem. If mounted in line with the axis of motion of the projectile, the inertia of the slider itself can cause it to move either when it's being accelerated on launch or decelerated on impact.

they launched cameras from spudguns so I guess a pressure sensor can handle it


[youtube]http://www.youtube.com/watch?v=gy7LzH6arAw[/youtube]

From a low pressure ball valve cannon like the above, probably less than 200 fps perhaps - but we're talking about high subsonic velocities here, that's a lot more stress on the components.
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Unread postAuthor: ramses » Sat May 19, 2012 4:20 pm

Yeah, switches do not do well under acceleration.

My high school lost a match at the NRL 15 lb championship because a spade connector ripped itself off our switch. Solder everything, and use a removable link or screw on/off switch. The switches are really expensive (>$60), though.
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Unread postAuthor: jackssmirkingrevenge » Sat May 19, 2012 5:10 pm

tada, prototype N<sup>o.</sup> 1

It works, but only at 5 or so metres, and because the epoxy is in contact with the base of the piezo buzzer it sounds quite faint. Still, it's a start :)
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Unread postAuthor: sharpshooter11000 » Sat May 19, 2012 5:56 pm

Looking good, are you going to use a sabot with it? Also, loving the hole in your table! :D
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Unread postAuthor: jackssmirkingrevenge » Sat May 19, 2012 11:37 pm

sharpshooter11000 wrote:Looking good, are you going to use a sabot with it


The fins are the same calibre as the barrel, so all it needs is a pusher plate.

Also, loving the hole in your table! :D


Few things in my workspace don't have projectile-related holes in them :roll:
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Unread postAuthor: Petitlu » Sun May 20, 2012 2:20 am

Remains is to paint it!
Good job, and as you say it is the beginning!

It is still 96g, the epoxy is heavy!
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Unread postAuthor: dewey-1 » Sun May 20, 2012 8:49 am

JSR;
Where is the COG location?
Can you send me the sat file to analyze?

Here is an interesting possibility.
http://www.jbgizmo.com/page22.html
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Unread postAuthor: jackssmirkingrevenge » Sun May 20, 2012 12:25 pm

Here is an interesting possibility.
http://www.jbgizmo.com/page22.html


Interesting indeed!

dewey-1 wrote:Where is the COG location?


See attached :)

Can you send me the sat file to analyze?


I would have to redraw it to be relevant to the actual projectile.
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Unread postAuthor: Petitlu » Sun May 20, 2012 12:28 pm

ignition of the NeverLost:
70 arcs with one AAA battery!

Image
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Unread postAuthor: jackssmirkingrevenge » Sun May 20, 2012 12:39 pm

Excellent :D I just need to paint the projectile and make the pusher plate so this will be on its way to you in a couple of days.
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Unread postAuthor: Petitlu » Sun May 20, 2012 12:41 pm

cool!
you sent me along with the other?
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Unread postAuthor: jackssmirkingrevenge » Sun May 20, 2012 12:51 pm

Petitlu wrote:you sent me along with the other?


I was thinking of sending them separately... I don't know, I have a feeling that a projectile shaped object with electronics is going to raise an eyebrow at customs...

By the way, are you sure the firing area will be completely clear? I would not want to be hit by this thing :-/
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Unread postAuthor: Petitlu » Sun May 20, 2012 12:57 pm

You can send them to me separately, no worries!

For the shooting area, there is no problem!
:wink:
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Unread postAuthor: POLAND_SPUD » Sun May 20, 2012 2:45 pm

I have a feeling that a projectile shaped object with electronics is going to raise an eyebrow at customs
not if you label it as female pleasure device :D
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