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View Full Version : how many cu. ft.

liljojo4711
09-09-2009, 06:31 PM
can someone give me an estimate (or actual) sq ft of this drawing using 3/4" mdf:

http://i31.tinypic.com/2womauu.jpg

liljojo4711
09-09-2009, 08:14 PM
can someone atleast give me a formula or something

bhsdriller
09-09-2009, 08:14 PM
L x W x H divided by 1728 for a square/rectangle, not sure with the angle in there though

liljojo4711
09-09-2009, 08:27 PM
lol.... thanks

john denver
09-09-2009, 08:31 PM
just over 1 cube it looks like

Didnt count wood in that though

4OZGLOVES
09-09-2009, 08:34 PM
84.6 cubes

sorry i'm 7 guiness in the hole.free bump

john denver
09-09-2009, 08:35 PM
.83 before sub

liljojo4711
09-09-2009, 08:47 PM
my brother is an engineer and we got .754 before sub displacement. how did u get .83 before sub? jw who is right lol.

tinmanchris217
09-09-2009, 10:01 PM
Splitting the left pentagon into a trapezoid + rectangle (each with a height of 6.25" after wood thickness)... then multiplying it by the width (11.5").... I got 0.904 cf before displacement.

If it's a 10" sub, I'd guess 0.1-0.15 cf displacement. Meaning it's 0.8 cf sealed IV box after displacement.

Edit: If your brother is an engineer too, he probably suggested "Fill it with water, and carefully pour it into measuring cups/buckets!" (my initial thought)

liljojo4711
09-09-2009, 10:41 PM
haha yeah. so u got .904 before displacement, i got .754 and the other guy got .83. something is wrong with two of our calculations....

30hrtz
09-09-2009, 10:44 PM
close enuff guys! lol its small, im sure id come up with some thing in between there too. wait i will try right quick. brb!

30hrtz
09-09-2009, 10:51 PM
ok. i got 1.080337 bfore sub displacement.

30hrtz
09-09-2009, 10:52 PM
so ruffly .85 after displacement. were all close

Johnny Law.Lulz
09-09-2009, 10:52 PM
go to fosgates site and use their thing.

Johnny Law.Lulz
09-09-2009, 10:54 PM
Its .92 before displacement.

liljojo4711
09-09-2009, 11:47 PM
ok. im going to be putting a re se 10 in it probably and the recommended box size is .65 sealed so its fine. maybe a tad big but its fine. just dont want to be too small. thanks for the help guys.

john denver
09-10-2009, 07:32 PM
Its .92 before displacement.

He got it right i was scribbling on scrap paper and broke down into two boxes and took off to much wood thickness. He did it the smart way buy using a calculator already there

dappa5
09-10-2009, 09:20 PM
http://www.the12volt.com/caraudio/boxcalcs.asp
try here i'm to lazy

dappa5
09-10-2009, 09:29 PM
my brother is an engineer and we got .754 before sub displacement. how did u get .83 before sub? jw who is right lol.
ok well you and the engineer need to draw things out on paper cuz 6 in in top and 7 in up will not give you 12 in on face / hell here look http://i668.photobucket.com/albums/vv50/DAPPA5/bored.jpg

tinmanchris217
09-10-2009, 11:15 PM
ok well you and the engineer need to draw things out on paper cuz 6 in in top and 7 in up will not give you 12 in on face / hell here look http://i668.photobucket.com/albums/vv50/DAPPA5/bored.jpg

Werd. His 2nd-hand engineering isn't quite there.

As a 1st-hand engineer said earlier: 0.9 before displacement. 0.8 after.