Tech Pubs report, submitted for peer review

[btrueblood]

Some time ago, our colleague Skogsgurra posted a report on the results of some external ballistics research, involving cans of pressurized fluid and fast-moving lead projectiles.

In the spirit of his efforts to advance scientific knowledge, and to help him stave off recent grumpiness, I offer the following submission, in two parts (pdf file for text report, and video clip in wmf format).

http://files.engineering.com/getfil...be-ad54-e79ce97577e0&file=Tech_Pub_Report.pdf

http://files.engineering.com/getfile.aspx?folder=cf15a876-d1e2-49f3-9410-f6fb5ca1d5f5&file=Movie.wmv

 

[Ron]

Gunnar will somehow wire it to flash and fire every 3 seconds...but at least he won't be grumpy.

btb...cool clip!

 

[Skogsgurra]

I find it very commendable to submit scientific work to the Tech Side of the Pub community for review.

Our North-western US member BTB has shown a good example in his basic research in weaponry making in modern production tools and I recommend more members to publish their work, findings or - as may be the case - accidents.

I have done some work in ballistics myself (hitting beer can with bullet and also documenting a turd hitting a ventilation device aka fan) and enthusiastic response from fellow scientists and dabblers encourages me to explore other highly energetic and dynamic devices or situations.

My recent work (still unfinished, but ongoing) is to explore the risks involved in loading a standard mouse trap. The picture

http://www.gke.org/pub/files/Falltest.JPG

shows a crude testing fixture with an exploded mouse trap. I am not willing to discuss details (mostly because there's fierce competition fom China) so I have kept all annotations in my native (and hopefully uncomprehensible) language.

I plan to document the results using my recently found (it has been missing for almost a year) Exilim high speed camera. Stand by for more reports from the frontier of mouse trap research!

Gunnar Englund

http://www.gke.org

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Half full - Half empty? I don't mind. It's what in it that counts.

 

[MadMango]

I consider the lathe test as PASS.

"Art without engineering is dreaming; Engineering without art is calculating."


Have you read faq731-376 to make the best use of these Forums?

 

[btrueblood]

Thanks all. Ron, the only thing I'd do differently for my next video effort is put the camera on a tripod...I'm not very steady when taking photos, and when I'm laughing it gets worse.

 

[Artisi]

I think the old rusty clamp spoils the whole design concept, and secondly, does it work on other than red mice?

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[Skogsgurra]

The illustration shows the preliminary tests. I will use a unified design with hardwood blocks and bolts and everything will be very aesthetically arranged. Just you wait!

The trap works on all living creatures, cats and humans included. Not limited to red rats, which - I agree - is what the picture seems to imply.

The original document, dated back in 2006, is in Swedish and is a complaint letter sent to the importers of the mouse trap in question. It is here:

http://www.gke.org/pub/files/Rattfallor Broderna Nelson 1.pdf

The picture on page two illustrates how a human hand was damaged, WARNING not for blood-sensitive individuals, when trap exploded under said hand during loading operation. A mentioning is made that the trap has no CE* marking and it recommended that the design is changed so that the little clamp doesn't come loose from the wooden base.


*Some Chinese goods have a CE marking that obviously means "Chinese Export" - but it is not that marking we are asking for here.

Gunnar Englund

http://www.gke.org

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Half full - Half empty? I don't mind. It's what in it that counts.

 

[JStephen]

When I was in college, I bought a 0.45" caliber "Old Ironsides" cannon and the barrel from a 0.70" caliber "Napoleon" cannon. The Old Ironsides was a standard naval-mount, and I built a similar wooden carriage for the Napolen barrel (which was actually a civil-war horse-drawn cannon).

A friend and I did build some ships and sank them at a stock pond. The bigger ship was made from half of a 55-gallon drum (sawed in half lengthwise).

Also, from Dixie Gun Works, I got a 0.80" or so caliber barrel, brass, that is actually smaller than the Napoleon barrel.

Dixie Gun Works sold round-ball molds in any caliber, so it was easy to cast old wheel weights into projectiles.

 

[Artisi]

Gunnar,

Could you please translate or give me an approx. English term/meaning of the following - trevnaden, avätna, slusatsen.


I always thought that "CE" on Chinese goods meant "Chinese Equivalent"

thanks

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[Skogsgurra]

Oh!? You actually tried to read the text? Very enterprising.

trevnaden = feeling of comfort and coosiness

avätna = gnawn away, not there any more (like bait in a mouse trap)

slusatsen (bad spelling, should be "slutsatsen") = conclusion

Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

 

[Artisi]

I did read, after a rough translation (google of course) which certainly makes life easier today than when I was dealing with a Swedish company some years back - (pre google)

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[MadMango]

A friend and I did build some ships and sank them at a stock pond.

I've sank model ships that I've built, but only with BB guns, does that count? They were balsa models of tall ships (the Cutty Sark and USS Constitution come to mind), and the BBs seemed to be of adequate scale.

When I was involved with obtaining CE marking for products, it stood for "Communauté Européenne", or "European Community", but I guess it doesn't mean the same thing anymore according to Wikipedia.

"Art without engineering is dreaming; Engineering without art is calculating."


Have you read faq731-376 to make the best use of these Forums?

 

[btrueblood]

JS,

I'm too chicken to load a real projectile in the cannon. Maybe rock salt. Then I can deal with those pesky kids, and their dog too.

Gunnar - there was a reference to a smoked fish as bait, forget the Swedish term. Any English equivalent, or is it just a small white fish, smoked? And had me curious...are the tastes of your local rats so high-society that they snub offering of peanut butter? What next for them, caviar and champagne?

 

[Skogsgurra]

Peanut butter is virtually unknown in Sweden.

Most people in Sweden learned about peanut butter from Disney comic books.

The smoked fish would probably be the small Baltic herring, which when smoked gets really golden and tastes wonderfully. It is then called "Böckling".

The other way to prepare that Baltic herring is to put them in barrels to ferment. They are then called "Surströmming". I think we have talked about them already.

Böckling here

Tried to find a shorter url. No luck.

Surströmming here

Same comment.

Gunnar Englund

http://www.gke.org

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Half full - Half empty? I don't mind. It's what in it that counts.

 

[KENAT]

So it's a Kipper more or less?

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​

 

[Skogsgurra]

Yes, but kippers are made from North Sea herring. Coarser. The böckling is really delicious.

Gunnar Englund

http://www.gke.org

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Half full - Half empty? I don't mind. It's what in it that counts.

 

[zdas04]

Gunnar,
The {link https:long link}Link here{/link} construct works very well for long urls. Now that moderator powers have been restored I edited your post above to show it.

David