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"In the world of spuds today"

A place to ask general spud cannon related questions.
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Unread postAuthor: MaxuS the 2nd » Fri Mar 28, 2008 8:00 pm

Ahh, I was wondering whether it was 16 sides or 60 sides..... A hexdecagon is 16 sides.
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Unread postAuthor: Fnord » Fri Mar 28, 2008 8:06 pm

How many digits of pi did you use in your area calcs?
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Unread postAuthor: DYI » Fri Mar 28, 2008 8:09 pm

Everything was done to an accuracy of +/- 10<sup>-9</sup>. Even when multiplied by 16 (for the number of triangles in the shape) hardly enough error to throw the results that far off.
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Unread postAuthor: Brian the brain » Fri Mar 28, 2008 8:11 pm

In the world of spuds today, I updated my thread on the 500 psi bbmg Machine Pistol I made and got ZERO response...

:(


Hahaha

I do however feel satisfied with this new toy :D

http://www.spudfiles.com/forums/deathra ... 13762.html
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: SpudBlaster15 » Fri Mar 28, 2008 8:42 pm

DYI wrote:Also, at school I mathematically proved that a 2 dimensional shape (sexdecagon?) drawn completely inside a circle actually had more area than the circle it was drawn inside. The math teacher (P.h.d.)and several others were completely confounded, and the general consensus was that I had broken the universe. :roll:


Please post your calculations, because based on my interpretation of your description, this is impossible.
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Unread postAuthor: DYI » Fri Mar 28, 2008 8:55 pm

Based on my interpretation of the situation, it is also impossible, which is the only reason I considered posting it. I might get around to posting all the calcs tomorrow, but I don't have a lot of time right now.

The shape was a hexdecagon inscribed in a circle.
The radius of both was 10 units, making the area of the circle 314.15926535... units<sup>2</sup>.
By calculating the area of one of the 16 triangles composing the sexdecagon and multiplying by 16, we came out with something like 322 units<sup>2</sup>

This was all done using coordinates of the points, eliminating any measuring inaccuracy (and also making it take a lot longer to do). We used d<sup>2</sup>=(x2-x1)<sup>2</sup>+(y2-y1)<sup>2</sup> to find the lengths of the various lines, Pythagorean theorem to confirm those calculations, and then the simple a=(bh)/2 to find the area of the triangle. I did the whole thing 3 times, and with 2 differing methods, and the whole thing was checked over by the teacher and anyone else who would take a look at it. No one found any source of the obviously massive error.
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Unread postAuthor: SpudBlaster15 » Fri Mar 28, 2008 9:18 pm

I'm beginning to suspect a drawing error, but I'm too lazy to go over the graphing process (or do any coordinate geometry) right now. I'll take a look later.

If I or anyone else on this forum cannot figure out the error, I will print off your calculations and give them to my math teacher, because I don't know anyone else in my school that would have a chance at solving it.
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Last edited by SpudBlaster15 on Fri Mar 28, 2008 9:22 pm, edited 1 time in total.
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Unread postAuthor: super spuder » Fri Mar 28, 2008 9:22 pm

yea it has been a long time since i have posted on here. i kinda lost interest in spud guns for a few months. i didn't have any money cause i didn't have a job, but i got one now and the money flow is happening. My favorite pneumatic gun broke cause i forgot to put the bumper behind the piston. My advanced combustion is out of propane and i am too lazy to get more propane. My marble mini gun project prototype failed miserably, so that ended that project. Right now i am working on a BBMG. It should be done in a few weeks, depending on how much time i have to work on it.
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trying to decide on a new project, probably something small.
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Unread postAuthor: Bubba05 » Sat Mar 29, 2008 5:47 am

A BBMG? damn!!
Ha ha tonight is the night we go to war. My holy quest to aquire a CO2 extinguisher has come to its destany. Wish me luck and if i donot return you can say you knew me well..........

Bubba
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Unread postAuthor: dewey-1 » Sat Mar 29, 2008 9:58 am

--
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Last edited by dewey-1 on Sun Apr 20, 2008 11:44 am, edited 3 times in total.
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Unread postAuthor: DYI » Sat Mar 29, 2008 10:49 am

Here's the shape, exactly as it was drawn:

Image

Good guess dewey, but, taking a look at that, I think I've found the problem: 3<sup>2</sup> + 2<sup>2</sup>=13 and 4<sup>2</sup> + 1<sup>2</sup>=17. I measured one of the triangles with a base of ~4.123, while some of the triangles had a base of ~3.61. :facepalmheaddeskcombo:

Which means it actually has an area of ~300.3 units<sup>2</sup>.
I guess the simplest things can fool the best of us...
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Unread postAuthor: pizlo » Sat Mar 29, 2008 11:10 am

Hehe self ownage, its always fun to see.
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Unread postAuthor: DYI » Sat Mar 29, 2008 5:42 pm

In the world of spuds today, I fired an 8 pound dart ~360 yards at 350 psi with the SCTBDC. It likely would have gone a lot farther (read 600 yards), but the breach exploded, the disk failed 100 psi early, and the sabot was so tight that it melted in the barrel...
Ya gotta love high pressure :D

There is a video, but it doesn't show much other than the BOOM and one frame of the dart leaving the end of the barrel.

And before anyone asks, I found the dart (which is 5 feet long and dark black), then paced of the distance, then checked it with Google Earth to be sure. The choice of such a heavy projectile was to allow me to actually see it flying. A 1 pound dart in 2" bore could easily reach 1 mile.
*Cue random cries of bullshit*
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Unread postAuthor: Bubba05 » Sat Mar 29, 2008 5:59 pm

Its Ok DYI, Mate alot of the time I come on here saying i got a great distance only to have it ridiculed andtold im fulla S@#T. I beleve!!!

Sux you cannon had to explode to get a result thoe!

Bubba
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Unread postAuthor: elitesniper » Sat Mar 29, 2008 6:04 pm

only his union exploded.. :D
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