Welcome to the

Stuff the Warning Label Said Not to DoTM

Web Page

an OSP button.jpg Production

Home of the BFPG-9000 and other cool stuff.


 

USA Today Hot Site Jan25th 1999
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In the spirit and intent of many other potato gun web pages we must add the following disclaimer:

Potato Guns and anything else you see on this page are not real. They are figments of your overactive imagination. They do not exist. If they did exist ,however, they would be EXTREMLEY dangerous in the hands of an IDIOT. They would also be EXTREMLEY dangerous in the hands of even a NON-IDIOT if built or handled improperly. They could, say for example, maim or even kill someone if used improperly. So if you should care to disagree with our fictitious assertion and attempt to build a potato gun from any pictures or videos you see on this web page you do so at your own risk and peril. Should you then, say accidentally, cave the side of a head in or blow the arm off of a friend or loved one you do so at your own and sole responsibility and will hold neither Orange Smoothie Productions, or any of its members liable in any way. If you disagree then push the back button right now.

If you are a member of the Bandwidth Challenged community your needs will in no way be met by this page. It is chuck full of pictures and avi's. So please don't email us complaining about it. Just take a bathroom break and come back in 5minutes when its done loading. Have fun and be careful!

Thanks,

BotanikA - Craig Sparks


This is an ongoing project. New items will be added several times a year. If you have anything cool in the subject area, I would consider adding it or linking to it and crediting you. Email me, Craig Sparks, at BotanikA@ittc.ukans.edu

 

Site Index:

Stuff the Warning Label literally Said Not to Do toTM
Stuff that had no warning label but was cool or dangerous anyway
To Do List
Fantasy/get put in prison List

Pinatas of the flaming variety

Warning: Do not use near open flames. Use only under adult supervision.

Not to many things burn as well as Pinatas soaked in starter fluid and/or crammed with gunpowder and/or fireworks! Click on any of the links below to go to a page for that Pinata chuck full of stills and one or more mpeg movies w/sound of their demise. Ouch! That's got to hurt!

stien pic.jpgstien 1st burn frame 1.jpg

Stien the clown

Death by: Starter fluid and early Rev. Potato Gun

rambo with bandoleer small.jpgrambo burn frame 1.jpg

Rambo the clown

Death by: Firecracker stuffing. Note the Quake2 bandoleer of Black Cat firecrackers.

Meznorf post pic small.jpgmeznorf burn no1.jpg

Meznorf the Space Alien

Death by: Starter fluid and a 550mph BFPG-9000 potato slug to the chest. Be sure to check out how quickly the fire is put out by the potato gun.

Barney the Bear pic.jpgbarney burn frame1 small.jpgbarney burn frame2 small.jpg

Barney the Bear

Death by: Starter fluid and 2-liter Explosive Detonation

Michael pic.jpgMichael burn frame1 small.jpg

Michael Angelo the

Teenage Mutant Ninja Turtle

Death by: Quantum Singularity Implosion

Just kidding :) This was, however, one of the brightest things I have ever seen. He was torched with over 10cups of gunpowder.

 

 


Aerosal cans of Starter Fluid and Carburetor Cleaner

Warning: Do not dispose of in open flame.

 

aerosal mpg.jpg aerosal2 mpg.jpg
aerosal.mpg (1MB)

Starter Fluid

aerosal2.mpg (641kB)

Carborator Fluid

You know, after seeing that you kinda understand why they put that on the label. I vote for the Carburetor Fluid being cooler with the mushroom cloud and all.


the OSP button.jpg BFPG-9000

For those in the Quake2 community this is a gratuitus plug for my Quake2, 8-32 player, DM map Confidence Lost

ospdm1_small.jpg

It got a warm review from Talon's Strike on PlanetQuake back in April. And it was just featured on the premiere issue CD of PCaccelerator magazine as a essential Quake2 level to have.

If your even remotely inclined to check out levels I invite you to go read the review on PQ and download the level and let me know what you think. There is now even a CTF version of it. My fragile ego needs the attention :) Thanks, Craig Sparks - BotanikA

If you havent a clue what I'm talking about and your just here to see a potato gun then read on :)

The OSP BFPG-9000 close up.jpg

The OSP BFPG-9000

A mach1 capable pneumatic potato gun

with interchangeable 10', 20' and 40' barrels

ranging from 1 to 2 inches in diameter

 

The construction of the BFPG-9000 and the calculations on this page are the hard work of

Brett Gampper, Shane Haas, Rich Killoy and Joseph Vojko and myself, Craig Sparks.

Our disclaimer bears repeating at this time:

Potato Guns and anything else you see on this page are not real. They are figments of your overactive imagination. They do not exist. If they did exist ,however, they would be EXTREMLEY dangerous in the hands of an IDIOT. They would also be EXTREMLEY dangerous in the hands of even a NON-IDIOT if built or handled improperly. They could, say for example, maim or even kill someone if used improperly. So if you should care to disagree with our fictitious assertion and attempt to build a potato gun from any pictures or videos you see on this web page you do so at your own risk and peril. Should you then, say accidentally, cave the side of a head in or blow the arm off of a friend or loved one you do so at your own and sole responsibility and will hold neither Orange Smoothie Productions, or any of its members liable in any way. If you disagree then push the back button right now.

 

Hairspray is for Wimps

This is to make it clear that the BFPG-9000 is a pneumatic/compressed air based potato gun with a main volume of 4 gallons typically pressurized to 125psi. Conventional hairspray based potato guns typically only develop 10 to 20psi when firing are no match in comparison to the muzzle velocity and sheer destructive Kinetic Energy of compressed air based designs as will shortly become evident to you :)

The Muzzle Velocity Calculations

Most of the following mpeg movies and still images are of potato slugs in the 1/2 lb. range hitting their targets at approximately 550mph. This is an appreciable amount of Kinetic Energy as is evident the vaporization of the watermelons. Several of us at Orange Smoothie Productions are professional Electrical Engineers with strong math backgrounds. We were simply unable to help our selves and had to produce the following rather detailed theoretical muzzle velocity calculations. If you are a member of the non-mathematically challenged community you are invited to take a look at our interactive Mathcad 7 muzzle velocity worksheet. You can change the length of the main barrel, mass of the slug, main tank PSI, among other things to determine the muzzle velocity of your potato gun. Although we have attempted to make it as accurate as possible we are open minded to constructive advice on how to improve it. We want it to someday be the definitive article for Potato Gun Physics. If there are any Aerospace engineers reading this that would like to tell us how to model the supersonic shock wave inside the barrel we would like to hear from you. We do have plans in the works to actually measure the muzzle velocity of several experiments to compare them to the calculator. Please send all related questions and comments to me, Craig Sparks - BotanikA.

For those of you without Mathcad 7 here is a short expert from just one of the calculations from the worksheet. Click on image for readable, larger 1932x492, 49kB version.

mathcad calc small.jpg

Matchad 7 excerpt calculation.

The Potato Gun Calculators

The mathcad 7 interactive Potato Gun Muzzle Velocity Calculator

version 5.1 as of 09/12/1998

potato gun worksheet 5_1.zip (22kB)

The Adobe pdf non-interactive version

version 5.1 as of 09/12/1998

Potato Gun worksheet 5_1 (pdf) - Now Available

Here is a graph from the calculator for our first attempt at a super sonic potato. It is plotted as Velocity vs. Tank Pressure for 3 different barrel lengths of 10, 20 and 40 ft. melon no4 below is our attempt to obtain the Mach 1.0 point on the 40ft curve at the 125 psi point in this graph. Real world TBD supersonic shockwave considerations will no doubt cause these curves to take a non-linear dip around this point showing in the end we are a bit short. The planned BFPG-10K will soon fix that :)

muzzle velocity.jpg

Muzzle Velocity for 10,20 and 40ft barrels with Velocity vs. Tank Pressure. melon no4 below is the 125psi/40ft point. The planned BFPG-10K will put us in the 250psi range.

The Watermelon Mayhem

As stated above most of the following mpeg movies and still images are of potato slugs in the 1/2 lb. range leaving a 20ft barrel of 2" diameter and hitting their targets at approximately 550mph. The only exception is watermelon no4. It was our first and most likely failed attempt at over a mach 1 firing, although still impressive none the less.

The following picture is a montage of a close up the BFPG-9000 main chamber, setup for melon no1 and stills from the mpeg of melon no1 being destroyed. It was taken August 22nd 1998 at the last OSP LAN Party.

bfpg9000_small.jpg

Click on image for a larger 1024x768 (178kB) view.

Video Capture and Playback Information

Special note regarding the videos: All of the following videos are 320x200 30fps mpegs w/audio. One of the original AVIs was 14MB. The small loss of quality in the mpeg vs AVI's was deemed worth getting this down to 560K. I recommend the new Microsoft Media Player for viewing if you have Win95/98 as I have had great success with it viewing this mpegs at their full 30fps. If you are more sophisticated and know better than to use Microsoft products unless you have to then please by all means ignore me. :) Regardless, the most fun can be had by slowly stepping back and forth through the frames to watch the individual images. The most interesting frames are posted above each of the movies. The images were captured using a Cannon Canovision 8 E350 8mm video camcorder using it's 1/10,000 of second shutter speed.

 

melon no1

melon no1 stills small.jpg

Click on image for a full-size, 1314x247, 55kB view.

Terribly exciting that the potato slug was actually caught leaving the barrel. Way cool! Notice the whispy curl of air/dust going off of the top of the watermelon.

melon no1 mpeg.jpg

The 30fps mpeg w/audio of melon no1 at 559kB.

The mild profanity heard from the camera operator was due to his apparently unexpected coating by slimy watermelon residue.

 

melon no2

melon no2 stills small.jpg

Click on image for a full-size, 1302x241, 44kB view.

We had a significant leak on this one. We had a cracked potato slug when loading. Bad news! We should have reloaded but were too lazy. You can see air prematurely escape the barrel in the first frame here.

melon no2 mpeg.jpg

The 30fps mpeg w/audio of melon no2 at 403kB.

The air leak obviously slowed this slug down. Look how large of pieces are left flying away in this video compared to no1.

 

 

melon no3

melon no3 stills small.jpg

Click on image for a full-size, 1308x487, 115kB view.

Impressive early impact showing an inverted cone explosion similar to melon no1. Very thorough vaporization on this one!

melon no3 mpeg.jpg

The 30fps mpeg w/audio of melon no3 at 563kB.

SAFTEY SAFTEY SAFTEY. Both my brother, Brian Sparks - stIen, and the camera operator, Chris Bartels, were struck by high velocity debris from this watermelon. Both were wearing eye protection as was everyone involved. The grunting and subsequent Big Foot camera action are cool though!

melon no4

 

melon no4 stills small.jpg

Click on image for a full-size, 1308x487, 115kB view.

Our first attempt at greater than Mach1. This barrel is 40ft long and 1.5" ID. All of the other barrels on this page are single, continuos, 20ft sections. We glued two 20ft SCH200 pieces together by feathering the end of one of the sections so that it matched the curve of the built in receptacle end of the next piece. This was done to minimize any discontinuities the potato slug would encounter on its way down the barrel. Well as you can see in frame #2 above we are poor craftsmen. Look at the bottom of the frame and you can see the barrel shatter. This is right after the 20ft mark where the two pieces were glued together. Luckily no one was struck by a large 4" sharp piece of PVC that was ejected from this accident.

melon no4 mpeg.jpg

The 30fps mpeg w/audio of melon no4 at 235kB.

Despite the shattering of the barrel this is still a very interesting set of images. Note how the smaller slug sorta briefly cores out the watermelon as it passes through. This explosion has such a different look to it vs. melon no6 where the slug was 2" and the melon small. Sorry for the jerky camera action, we'll get a tripod next time :)

 

melon no5

 

melon no5 stills small.jpg

Click on image for a full-size, 1308x244, 69kB view.

This one is different. We got curious as to what would happen if we didn't shoot a slug at all but rather punched the end of the barrel into the watermelon and let the escaping air explode it from the inside. Obviously not nearly as destructive but still cool.

melon no5 mpeg.jpg

The 30fps mpeg w/audio of melon no5 at 215kB.

Note the very large pieces still left over in this one. We sure fixed that problem with melon no6.

 

melon no6

melon no6 stills small.jpg

Click on image for a full-size, 1172x246, 55kB view.

Smallish watermelon, less than the size of a basketball. Completely Vaporized! Very Mondo Cool frame #2; quite possibly the coolest thing I have ever seen ;) Sorta looks like it implodes first.

melon no6 mpeg.jpg

The 30fps mpeg w/audio of melon no6 at 301kB.

It is shots like this that make me wish I had a VERY high speed camera. The buzz you hear in the audio is a motor boat going by down on the lake below.

 

melon no7

melon no7 stills small.jpg

Click on image for a full-size, 1018x243, 69kB view.

Two long watermelons laid back to back. The experiment was to see if they would both be taken out. Check out the movie to see.

melon no7 mpeg.jpg

The 30fps mpeg w/audio of melon no7 at 427kB.

Well that sucked. The 2nd watermelon was totally unharmed. Apparently the force was so dissipated blowing up the first that there is nothing left.


Thanks for visiting the

Stuff the Warning Label Said Not to DoTM

Web Page

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Potato Gun links worth checking out

Ed's Potato Technology (Spud Gun) Center!!

THINGS THAT GO BOOM

SpudWiser - The Wiser Spud Gun


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