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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: dewey-1 » Thu May 03, 2012 5:39 pm

POLAND_SPUD wrote:@dewey
http://en.wikipedia.org/wiki/Proximity_fuze
The device described in World War II patent[15] works as follows: The shell contains a micro-transmitter which uses the shell body as an antenna and emits a continuous wave of roughly 180–220 MHz. As the shell approaches a reflecting object, an interference pattern is created. This pattern changes with shrinking distance: every half wavelength in distance (a half wavelength at this frequency is about 0.7 meters), the transmitter is in or out of resonance. This causes a small oscillation of the radiated power and consequently the oscillator supply current of about 200–800 Hz, the Doppler frequency. This signal is sent through a band pass filter, amplified, and triggers the detonation when it exceeds a given amplitude.


Is it feasible to reproduce this circuit ?


Like this? There are lot of similar circuits. The major issue is to fit into something small enough for our small projectiles. Under 20mm diameter.

http://electronic-schematic.blogspot.co ... ector.html
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Unread postAuthor: jackssmirkingrevenge » Fri May 04, 2012 12:03 am

dewey-1 wrote:Sorry. I actually meant to say a closeup photo of both sides to zoom in for better resolution. You can send high resolution images to my e-mail.


Will do when I get home.

In the meantime, I'm going for the keyfinder approach as a "Russian" approach hehe, something like this, I'll make four projectiles, MrC is bound to find at least one :D

Hmmm, this is pretty sinister:

Image

Ingrish FTW :D
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Unread postAuthor: Petitlu » Fri May 04, 2012 1:47 am

Excellent!
I read all the pages ... impressive ...
:shock:
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Unread postAuthor: jackssmirkingrevenge » Fri May 04, 2012 4:29 am

Petitlu wrote:I read all the pages ... impressive ...


If you have some free kilometres to shoot over we could talk ;)
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Unread postAuthor: Petitlu » Fri May 04, 2012 5:49 am

hehe ..
I can actually shoot on a large agricultural fields that exceeds the km ...:D

But try to find a 10cm long missile seems impossible to me ... :shock:
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Unread postAuthor: jackssmirkingrevenge » Fri May 04, 2012 6:32 am

Petitlu wrote:But try to find a 10cm long missile seems impossible to me ... :shock:


If it was easy, this thread would not have gone on for so long - but with the right design I don't think it's impossible :)

Do you have the possibility of fitting a larger diameter (for example 40mm) barrel to ThorJack?
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Unread postAuthor: Petitlu » Fri May 04, 2012 6:35 am

On Thorjack we can put a larger caliber barrel and a chamber 0.8L max !
Mix40 of course !
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Unread postAuthor: jackssmirkingrevenge » Fri May 04, 2012 7:15 am

Excellent :) thought I think 40x would probably be excessive, 15-25x is more than enough for test purposes, unless you want to travel to Italy to recover your projectiles :D

If you're interested we can try for some long range shots too. A 30-35mm barrel would be perfect.
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Unread postAuthor: Petitlu » Fri May 04, 2012 7:24 am

We have the copper 32mm
:D
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Unread postAuthor: jackssmirkingrevenge » Fri May 04, 2012 7:37 am

hehehehe perfect! Yes, we will be in touch about this :D
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Unread postAuthor: MrCrowley » Fri May 04, 2012 4:50 pm

Petitlu wrote:I can actually shoot on a large agricultural fields that exceeds the km
Ohh! :D

Are the fields covered in a short grass? Sounds like you have an ideal range that's much closer to JSR than I. An 800ml chamber should be sufficient also.
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Unread postAuthor: jackssmirkingrevenge » Fri May 04, 2012 4:53 pm

MrCrowley wrote:Ohh! :D


Much like a long range projectile, that went completely over my head :s

Are the fields covered in a short grass? Sounds like you have an ideal range that's much closer to JSR than I. An 800ml chamber should be sufficient also.


France is certainly easier to post to than NZ, certainly.
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Unread postAuthor: MrCrowley » Fri May 04, 2012 4:56 pm

jackssmirkingrevenge wrote:Much like a long range projectile, that went completely over my head :s
That wasn't even the full version :D
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Unread postAuthor: jackssmirkingrevenge » Fri May 04, 2012 5:01 pm

I get the reference, but are you just implying that any projectiles fired will find themselves buried in equine targets :D

Well, there is aprecedent.


Image

When launched from a height they strike the objective with terrific force, and will readily penetrate a soldier's helmet and skull. Indeed, when released at a height of 4,000 feet they have been known to pierce a mounted soldier's head, and pass vertically through his body and that of his horse also.
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Unread postAuthor: Petitlu » Fri May 04, 2012 5:06 pm

must be made missile with onboard electronics
:D
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