On Monday, March 20, 2023 at 1:04:19 AM UTC+8, Douglas Eagleson wrote:
Well I go thru my list of ideas and found an old one.
It is robot surface craft with enough fuel to go to
the English Isle's. Launched from a boat ramp in the
Chesapeake Bay USA.
The key to long range craft is basically to over come
drag. Note that the craft mass has no effect on
drag efficiency. It is a length to beam relation.
The mass only slows the craft acceleration.
But, this craft has a constant velocity.
My design uses Ferro cement hulls. With a thickness
and length and mass suitable for trailering by a small truck.
Making a very inexpensive craft hull.
Just be reminded that a hull is about less than 25% of
the final cost. I can make these in my backyard.
And ship them to the customer by container ship.
I need advice on the propulsion engine. Is a $400 Chinese
air cooled diesel motor efficient enough? Is there some
kind of fuel to craft volume ratio as a design issue?
With modern technology the basic cost is the engine.
Also is a semisubmersible craft better efficiency wise
in higher seas? Here the mass is a big concern,
considering a wave deceleration effect. Maybe only
wave breakers are the concern, since waves are
a up and down effect, canceling out velocity
impact?
Wait, I forgot the pitching effect on velocity. Short waves
can stop it dead in the water. Here mass matters.
--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)