XPost: sci.electronics.design, sci.physics, sci.space.policy   
      
   In sci.physics Phil Hobbs  wrote:   
   > On 11/07/2016 01:37 PM, jimp@specsol.spam.sux.com wrote:   
   >> In sci.physics Robert Clark  wrote:   
   >>   
   >>    
   >>   
   >>> If you know of a means to provide 50,000 V at *lightweight* then you will   
   >>> have solved the problem of an independently flying lifter, using the   
   >>> macrosized wires currently used. You would need about a power to weight   
   >>> ratio for the power source of better than 1 watt per gram, while being able   
   >>> to provide these ca. 50,000 V voltages.   
   >>>   
   >>>  Bob Clark   
   >>   
   >> Trivial; look at any camera flash unit built in the last several decades.   
   >>   
   >> However you have totally missed the point; voltage and the weight of the   
   >> converter is irrelevant as it is the total power that determines the   
   >> weight of it all.   
   >>   
   >> BTW, here are some real world power to weight ratios:   
   >>   
   >> Boeing 777 engine 10 kW/kg   
   >  1985 Chevy Celebrity 300 W/kg <-- So for a 1000 kg car, that's 402   
   > horsepower?  Sign me up! ;)   
   >   
   > Cheers   
   >   
   > Phil Hobbs   
      
   No, that is the power to weight ratio of the engine, not the power to   
   weight ratio of the car.   
      
      
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   Jim Pennino   
      
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