[PSUBS-MAILIST] landing craft

[Stephen Fordyce via Personal_Submersibles]

Hi Hank,
I've done a fair amount of stuff with overloaded dive boats with outboards
that size - enough to know that displacement speed + full throttle
!= cavitation (necessarily).

Have you tried lowering the engine deeper into the water?  And/or getting
the "suction" area of it further away from the boat?

Failing that a different prop could be the next thing to investigate.

Cheers,
Steve

On Thu, Jun 15, 2017 at 11:10 AM, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi All,
> Got a problem to solve, my sub barge has a 30 hp outboard motor.  When I
> try to cruise fast it cavitates real bad.  When I push something that won't
> move like a dock, I can push at full throttle no problem.  I am planning to
> build a landing craft 36 feet long using the steel hull from my paddle
> wheeler.  I am building it to carry and launch Elementary.  My concern is,
> because it is a displacement hull and it will be slow,  will I have the
> same problem with cavitation  that the  barge has.  Do I need to use a jet
> instead?   I can't work on it for a year, but I want to  source all the
> parts, engine, drive etc etc.
> Hank
>
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