XPost: sci.electronics.design, sci.physics, sci.space.policy   
      
   In sci.physics krw  wrote:   
   > On Tue, 8 Nov 2016 22:05:29 -0000, jimp@specsol.spam.sux.com wrote:   
   >   
   >>In sci.physics mike  wrote:   
   >>> On 11/7/2016 11:13 PM, jimp@specsol.spam.sux.com wrote:   
   >>>   
   >>>>   
   >>>> Aircraft engines don't lift anything.   
   >>>>   
   >>>   
   >>> OK, how about, "Aircraft engines,   
   >>> when properly fixtured,   
   >>> can result in objects disengaging contact with the earth?"   
   >>   
   >>How about the engine on fixed wing aircraft provides thrust to overcome   
   >>total drag to accelerate the aircraft to an airspeed sufficient to   
   >>provide enough lift from the wings to overcome the force of gravity?   
   >>   
   >>How about the engine of a helicopter provides power to spin rotating   
   >>wings to a speed sufficient to develop enough lift to overcome the   
   >>force of gravity? For the purpose of this discussion assume that the   
   >>angle of attack of the rotor blades has been set appropriately.   
   >>   
   > There is more than one aircraft with a thrust to weight ratio greater   
   > than unity, not to mention a rocket or two.   
      
   Yes, there certainly are but they are niche aircraft in the overall   
   scheme of things and an extremely small percentage of aircraft.   
      
   Maybe you'd like to include ornithopters in the discussion of engines   
   for flying machines.   
      
   Rockets are rockets.   
      
   https://en.wikipedia.org/wiki/Aircraft   
      
      
      
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