[PSUBS-MAILIST] hydrodynamics question

[Alec Smyth <Asmyth@changepoint.com>]

My design has twin props astern, in tunnels fed by side-scoops (a la fighter
jet). I'm currently making the mold for the stern fairing, and I'm
contemplating the best size and shape for the scoops. Given that water is
essentially incompressible, am I correct to assume the frontal area of the
scoops should be the same as the area of the prop tunnels? Another
possibility would be to eliminate the scoops altogether and go with NACA
intakes or such. But the scoops are definitely sexier.

Anyway, since my above assumption is based on intuition instead of
knowledge, any educated speculation would be much appreciated!

thanks,


Alec