From: eaglesondouglas@gmail.com   
      
   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.   
      
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