Quote:
Originally Posted by rxw
Actually not to be anal but a 3' dump plus a separate 2' dump only equals a 3.6' total dump area because it works on surface area...
3’ dump = 1.5 (radius) squared times pi
2’ dump = 1 (radius) squared times pi
3’ area + 2’ area = 10.210 square inches
Divide that by pi then square root it you should get 1.80277564 (radius)
Now double that and you have you total diameter for your exhaust dumpage AREA

flow is going to be a bit different and your method would have less flow loss