Hopefully this is the final insanity lol.
I was abol to borrow a set of test plates from my equipment supplier. (Jamison equipment)
Here are the results I came up with. keep in mind that these plates have been checked on a fiew SF benches so I am using the asumption that they are accurate, I've noticed the numbers varied between test plates so im a little confused.
the formula i used to figure my disk was. 13.55*ori diameter SQRT * SQRT28
my plate thickness is .050 using a sharp edge
Using 600 cfm test plate tested @28" a 2.5" hole
4.193 hole (1265 cfm) 49% @ 28"
3.625 hole (945 cfm) 74% @28"
2.550 hole (467) 92@ @28"
2- 1.590 holes (362) 77% @28"
1.770 hole (225) 72% @28"
1.320 hole (125 cfm) 71% @ 28"
Using 450 cfm test plate with 1.897 hole
4.193 hole (1265 cfm) 27% @ 32"
3.625 hole (945 cfm) 41% @ 28
2.550 hole (467) 96% @28
2- 1.590 holes (362) 89% @ 28
1.770 hole (225) 80% @ 28
1.320 hole (125 cfm) 70% @ 28
.930 hole (62 cfm) 75% @ 28
Using 300 cfm plate 1.746 hole
4.193 hole (1265 cfm) 20% @ 34"
3.625 hole (945 cfm) 34% @34"
2.550 hole (467) 95% @29
2- 1.590 holes (362) 89% @ 28
1.770 hole (225) 79% @ 28
1.320 hole (125 cfm) 74% @ 28"
.930 hole (62 cfm) 69% @28
Using 1.200 150 cfm test plate
.930 hole (62 cfm) 55% @ 28
1.320 hole (125 cfm)77 % @ 28
using .805 test plate
.930 hole (62 cfm) 52 % @ 28