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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: Bubba05 » Sat Mar 29, 2008 6:06 pm

Still an explotion?? Id hate to have my face near it?
A cantastofic event in a fire arm no matter how smalll can still take out your eye!!

Bubba
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Unread postAuthor: DYI » Sat Mar 29, 2008 6:23 pm

The union didn't explode.

I believe I stated quite clearly in my post that the breach exploded.
If the cannon had exploded, there'd be a thread about it.

The breach was ABS, so no shrapnel to speak of. The fix is simple (cast reinforced concrete around the new one), but annoying, because I wanted to get three shots today. The reason it exploded was that I had to maul it with a pipe wrench last week to get it apart after it was cross threaded.

And the whole "calling bullsh*t" thing was kind of a joke... Because when you have a 230ci, 500 psi, 3" bore, 18 foot long steel burst disk gun, people will, for some reason, believe any range claim you make.
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Unread postAuthor: elitesniper » Sat Mar 29, 2008 6:24 pm

oh, cause I thought you union loaded.. :oops:
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Unread postAuthor: DYI » Sat Mar 29, 2008 6:29 pm

The union is 2", the barrel is 3". Kind of difficult to breach load through that I imagine :lol:
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Unread postAuthor: elitesniper » Sat Mar 29, 2008 6:31 pm

ahh, im an idiot. Mabey your using some alien expanding ammo who knows.. :)
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Unread postAuthor: super spuder » Sat Mar 29, 2008 8:05 pm

hmm too bad i don't understand any of the math you guys are using, might be interesting stuff if i could understand it :?

@ DYI wow, 1 mile is a long way away lol, mabe some day i can build a cannon to shoot that far, and mabe not destroying its self in the process :wink: were you remote firing it when the cannon broke?
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Unread postAuthor: SpudBlaster15 » Sat Mar 29, 2008 9:08 pm

super spuder wrote:hmm too bad i don't understand any of the math you guys are using, might be interesting stuff if i could understand it :?


You've never taken a grade 9 math course? In our curriculum, we learn the very basics of coordinate geometry in grade 9 (The Cartesian plane, distance formula, midpoint formula, etc), then in grade 10 we progress to basic equation writing (linear equations) which involves aspects such as slope and y-intercept (again, very basic), then in grade 11 we progress to more complex aspects such as exponential slopes, and equations with an axis of symmetry and a vertex, as well as calculating interception points within equation systems involving 2 or more equations, and calculating the shared area between the equations of an inequality system, and... (Ok, so now I'm just rambling...)

Anyway, DYI, you should really get around to building that hybrid of yours, because it must be quite hard on your wallet to pay $4 per shot, despite how few shots you are able to fire in a day due to the longest reload time in spudgun history. :roll: :lol:

With all the firing you've been doing lately, can we expect some video footage of the SCTBDC in the near future?
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Unread postAuthor: Bubba05 » Sat Mar 29, 2008 9:11 pm

Sorry DIY my bad!! :oops:
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Unread postAuthor: super spuder » Sat Mar 29, 2008 9:39 pm

i passed grade 9 math... and grade 10 math (barely) but all we learned was the midpoint, linear equations, slope, and something about the slope of a circle that i fell asleep in that class and missed the whole lesson... my bad :roll: i don't understand any of the math you guys were using.
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Unread postAuthor: mark.f » Sat Mar 29, 2008 10:02 pm

DYI,

You could have made the whole process a lot simpler by using the formula:

Area = nr<sup>2</sup>sin(pi/n)cos(pi/n)

for the area of that polygon, where n is the number of sides, and r is the radius of the circle the polygon was inscribed in.

Therefore, your polygon would have an area of about 306.1467 square units, according to the cheap Casio calculator I'm using right now.

If you care to know where I got that from, here's the scrap I did it on. I find things much simpler to do in a general sense first, and THEN move on to the specific criteria of the problem.

<div align="center">Image</div>
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Unread postAuthor: super spuder » Sat Mar 29, 2008 10:29 pm

:x :x :x wow, that is advanced math, only thing i understand is there you used the pathagreum theriun (i cant spell either) (A^2+B^2=C^2 thingy) ( that is what you used right?)

edit: oh yea... and i kinda get that sin thing you were doing on the left, not sure excactly what you were doing though. i forget most of that stuff from math already.
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Unread postAuthor: SpudBlaster15 » Sun Mar 30, 2008 12:04 am

super spuder wrote::x :x :x wow, that is advanced math, only thing i understand is there you used the pathagreum theriun (i cant spell either) (A^2+B^2=C^2 thingy) ( that is what you used right?)

edit: oh yea... and i kinda get that sin thing you were doing on the left, not sure excactly what you were doing though. i forget most of that stuff from math already.


All of the math I see in Mark's post is no higher than grade 9 level. In fact, while I was in grade 9 math, I solved a similar problem (bonus question) by deriving what I believe was the same formula Mark derived just recently. It really isn't very advanced if you look beyond the initial "OMG MATH!!!! ! ! ! 1 1 1" reaction that most people seem to have when shown anything that involves the Greek letter theta, trigonometric ratios, and exponents.

I was going to use the graphing approach to attempt to locate DYI's error, but it seems he has found it himself. :wink:
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Unread postAuthor: Bubba05 » Sun Mar 30, 2008 5:07 am

Hill billy bashes hammer on cannon......dah u push the button and it goes BANG!!!!!
Sapose im like an ork i beleve it works so it works!
I leve all the matamaticks to you guys.

Bubba
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Unread postAuthor: DYI » Sun Mar 30, 2008 8:37 am

I don't know what kind of school you go to SB15, but at our school, that is the advanced Grade 11 level. And by using that formula, I came out with an answer of 0.19635 units<sup>2</sup> :?
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Unread postAuthor: LikimysCrotchus5 » Sun Mar 30, 2008 10:48 am

Thats geometry that i have already learned but i didnt learn all of that. I think there is also some trig in there as well.

At my school, that math can be 9th, 10th or 11th grade math. If you come from the middle school (public) then you can take algebra and geometry and then start off highschool with trig and end up with taking statistics in 12th grade. But i didnt go to the public middle school so i started out with algebra :( which by the way was extremely easy.
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