Re: HP, weight and visability

[Coast Guard Kiteman <exfloridians@ecsu.campus.mci.net>]

At 09:29 PM 4/24/1998 -0700, you wrote:
>Jon Hylands wrote:

>> On Fri, 24 Apr 1998 19:23:07 -0700, Martin Sanderse
>> <sanderse@ingenuitygroup.com> wrote:
>> > One disadvantage of the double hull used for streamlining is that there
is a lot of mass
>> > (in this case water) within the total hull envelope that the motors
have to start and
>> > stop.  Thsi would imply either a larger motors and props to overcome
the inertia, or put
>> > up with sluggishness.

>> Not necessarily. If most of the space between the hulls is filled with
>> non-compressible foam, then it's not a problem...

>Well, the only way to get the foam or microballons or whatever to sink is
by adding 
>weight, so I can restate the case by saying that the lead or hull weight
you had to add 
>to get the sub heavy enough to sink the foam  . . . . 


        Are there any foams or composite materials that are 'heavier' so
that they act
as a filler but don't contribute so much buoyancy?