View Full Version : displacement of 45's

11-20-2012, 07:22 PM
Is there a rule of thumb or something to figure how much displacement you lose from putting 45's in the corners and such. I know I can use math to figure it out but to dumb anymore to figure it out.

11-20-2012, 07:24 PM
Depends on the size of your 45's. Easiest way is to measure the area as a square, solve for area, then cut in half.

11-20-2012, 07:33 PM
3" wide at the large end seems to be standard.

11-20-2012, 09:17 PM
3" wide at the large end seems to be standard.

If I'm just altering a box that is spec'd w/o 45's, I only put one in the port. Just make it big enough to maintain port width at the corner.

11-21-2012, 02:36 PM
from what i understand, when ur adding 45's to the port, you dont have to subtract anything. since you are adding them to keep port width more consistant and help improve airflow. when i build my boxes im actually going to try to make the port turns half circles instead of 90* angles. still not sure how im going to accomplish that but if it works i will be happy, mainly because im going to have a Folded port, not just an L port.


11-21-2012, 09:15 PM
I was referring to 45's in the corners.

Well I did the math, when using a 3" wide 45, it looks like you lose .0026 cubic feet of airspace for every inch of brace.