How to calculate weird shaped box?

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BrettG

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Joined: February 13, 2003

Location: United States

Posted: October 08, 2004 at 10:11 AM / IP Logged

I am building a new enclosure for my 92 Camaro and the trunk sucks as many know!! How so you calculate the CuFt for the weird shaped box!!! I have added a picture that isn't too good but u get the idea.....

How to calculate weird shaped box? -- posted image.

Thanks a lot!

Brett

BrettG

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Joined: February 13, 2003

Location: United States

Posted: October 08, 2004 at 10:13 AM / IP Logged

stevdart

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Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: October 08, 2004 at 11:27 AM / IP Logged

Use the face of the box as your reference, draw it on paper with all dimensions. Break it up in chunks, some will be rectangles, some will be triangles. Add them all up for the total.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

heavilymedicate

Silver - Posts: 328

Joined: August 05, 2004

Location: Texas, United States

Posted: October 08, 2004 at 12:41 PM / IP Logged

Fill it with water! Then get a HUGE measuring cup and dump out all the water (get a few friends with strong backs to help, it will be heavy). Read the measurement! Your done. If you dont have a giant measuring cup and a water proof box or if your friends think your stoopid and refusue to help; do what stevdart said.

heavilymedicate

Silver - Posts: 328

Joined: August 05, 2004

Location: Texas, United States

Posted: October 08, 2004 at 12:42 PM / IP Logged

BTW, i would brace that badboy, looks like a long span. Remember to count your bracing in your numbers.

boxmaker85

Silver - Posts: 433

Joined: September 19, 2004

Location: United States

Posted: October 08, 2004 at 12:50 PM / IP Logged

Well... If you use the formula for integrating multiple variable functions that you should remember from calculus 3 then calculating the volume of the box will not be that difficult (except for finding the equations of the curves and such). But if you're not a math/science dumb @$$ like me then try water. Or even styrofoam peanuts. Both work well. Both have benifits and disadvantages (water = free, water = heavy; peanuts = light, peanuts = some money unless you have a ton of peanuts laying around just for that). Good point heavilymedicate. Brace that biatch up. or it will flex.

forbidden

Platinum - Posts: 5,352

Joined: November 01, 2003

Location: Alberta, Canada

Posted: October 08, 2004 at 1:02 PM / IP Logged

Here is another thing to consider. If you know the volume requirement of the sub, build the box as a rectangle (simple math) if it will fit. Make the top to fit the contours of the panelling. Make sure you have enough depth to the box for that port to fit. Another thing to consider on these cars is the back hatch comes down on such an angle that it gets hella close to the sub in some cases, make sure you have enough clearance between the sub and the hatch when it is closed.

Top Secret, I can tell you but then my wife will kill me.

flynntech

Copper - Posts: 275

Joined: April 15, 2004

Location: United States

Posted: October 08, 2004 at 10:59 PM / IP Logged

Hi Bret,

I owned an '84 TA once, I actually stuck with a regular sealed box with two 12"s in the rear seat area for better wieght distribution. The rear pit is an excellent place for the subs though...the rear hatch provides incredible relflection.

http://www.thirdgen.org/techbb2/forumdisplay.php?s=&forumid=9

This is a great site for anyone who owns a thirdgen. It's possible you will find some more box ideas too. As for cubic feet, you should have payed more attention in math geometry! Really, I second the peanuts.....but do you have a sub picked out yet?

Asmodeus

Silver - Posts: 393

Joined: September 02, 2004

Location: United States

Posted: October 08, 2004 at 11:25 PM / IP Logged

Make a box that is like 3cuFt without a top on it....Get some sand and fill the little box...Then start filling the large box and count how many cuft of sand you put in it...I did this once for S*&%s and giggles just to see what the box had...It was a weird design also....

It works but takes a long time and a lot of sand...Have fun

Making the World A Louder Place

jeffchilcott

Platinum - Posts: 2,483

Joined: April 11, 2002

Location: United States

Posted: October 08, 2004 at 11:56 PM / IP Logged

asmodeus it really sounds like you have had a little to much time one your hands to make a "sand Box" haha had to say it

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