Re: formulas

[David Buchner <Buchner@wcta.net>]

I've been reading some very old (try March) p-subs messages, and came
across a couple discussing how to figure displacement -- and from there,
how much the thing has to weigh to sink. I'm wondering how fussy you people
(those of you who have done this; those who have something to sink) got
with this: what about all the various junk inside, which takes up volume
and weighs more than air? What about gizmos which protrude on the inside?
Do you stick them in a carefully-calibrated bucket of water and measure the
water level rise? Do you weigh every little thing before installing it? Or
do you just figure ballpark: the volume of this cylinder plus this cylinder
plus these hemispheres -- and then allow for heavy enough trim weights or
big enough trim tanks to compensate for the little stuff?

Obviously, this is another reason why it would be handy to keep hull shapes
simple and smooth: like a cylindrical hull with hemispherical ends and
canopy, cylinders for battery pods and motors and ballast tanks and
everything... easier to compute. (The other reason being streamlining, I
guess.)


---------
David
buchner@wcta.net
http://customer.wcta.net/buchner
Osage MN USA