Aeroport port area equation

pi(R^2)

3.14 iirc

Just a funny thing I just remembered about Pi lol I work for Domino's as well Not THIS one but still funny but yes, 3.14
http://static.funnyjunk.com/pictures/47c00445_3d08_413d.jpg

Scapelli21 said:

pi(R^2)

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And does that gives square inches?

C'mon, guys...lol

Area of a circle...lol

And yea, I usually just use 3.1415 as 'pi'

jrod666999 said:

And does that gives square inches?

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Yes, sir...as long as you use inches as the radius

Huricain3 said:

lol, heres the forumlas to find the length needed and minimum PA required:

LV is Length of port
Dv = port diameter (cm)
Fb = tuning frequency (Hz)
Vb = net volume (litres)
Np = number of ports
k = end correction (normally 0.732)

Lv = (23562.5*Dv^2*Np/(Fb^2*Vb))-(k*Dv)

Sd = pi*(Dia/100)^2/4
Vd = Sd*Xmax/1000
MIN DIAMETER = 100*(20.3*(Vd^2/Fb)^0.25)/Np^.5

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Not trying to be lazy but if I just use a website to find port length isn't that the same info? Suppose I was build a 5cubic foot box for an '04 15" L7 tuned to 30 hz is 1-6" diameter aero port big around enough?

So I have some 5.75" diameter PVC that I am planning to flare myself to make my own aeros, I found that I need 2 with a total length of 31.5" in a 4.5 cube box( I am assuming that is after displacement of the sub, bracing, and ports?), So my ports would be (5.75*3.14)31.5/1728 = port displacement in cubic feet, correct?
Oh yeah, sorry for jackin your thread!

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I believe that calculators may use diff formulas as there is different ones i think. I just use calculators too. I am thinking the formula above will give you a bigger minumum PA then what manufacturers suggest(probly because space).