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P/N 3,066,893 December 4, 1962

04 Dec 2013 7:42 AM | Deleted user

Todays patent is one of Mercier’s fluid control patents.



      “It is known that the distribution of theoretical pressure 

exerted by a fluid on a stream-lined body having an axis

aligned or slightly inclined with respect to the general direction

of relative flow between the body and fluid, is characterized, 

beginning at the forward end of the body, by:

(a)A forward zone of dynamic pressure greater than the ambient 
     static pressure of the fluid. The pressure is a maximum at the
     extreme forward point of the body and decreases rearwardly
      to a value equal to the ambient static pressure;

(b) A depression zone follows the aforementioned forward zone, 

     wherein the static pressure becomes less than the ambient 

      static pressure. The location of the minimum pressure in the

      depression zone depends upon the shape of the body. The 

      said pressure increases rearwardly of the minimum pressure,

      until it reaches a value equal to the ambient static pressure of 

      the surrounding fluid at a location far from the body;

(c) A rear super-pressure zone much less in intensity than the 

      forward zone a.”

------------------

      “The result is an increase of drag, which it has been sought

to reduce in various ways, without hitherto obtaining a perfectly 

satisfactory result.

       An object of the invention is to improve the performance of 

streamlined bodies by increasing the speed thereof for the same 

energy consumption, or to reduce the amount of energy necessary

to impart a predetermined speed to the body.”


NOTE: Mercier does not claim that his drag reduction invention will be 

useful at large angles-of-attack. Nor does he mention a limiting

effective angle-of-attack (e.g.< 8 degrees).

N.B. An airship is the only flying vehicle for which drag is far more

important than lift.

Unfortunately, the USPTO neglected to cite:
   244/75.1 (Aircraft control) or 244/96 (Airship control) or,
   244/130 (Aerodynamic resistance reducing).

The patent is cited by eleven modern patents (only one related to

aircraft):

 3,194,201  Underwater missile,

 3,244,135  Device for controlling ship movement,

 3,425,741  Land vehicle having minimum air drag,

 4,125,083  Drive for submerged floating bodies,

 4,309,172  Ship with improved stern structure,

 4,327,469  Method for mounting ring-shaped construction on ship stern,

 4,395,965  Low drag underwater vehicle utilizing boundary layer suction,

 4,919,066  Hydrodynamic configuration for underwater vehicle,

 5,125,797  Portable water driven high velocity fan,

 5,389,021  Motorboat propeller safety shroud, and

 5,620,153  Light aircraft with inflatable parachute wing propelled by a ducted

                  propeller.

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