Another rotorcraft concept that is very innovative and straight from left field, (my favorite place to think) is that of Frank Black's Disc rotor concept, United States Patent Number: 4,913,376, dated April 3, 1990. And, once again, Boeing's name pops up with another shorthanded dealing as well that of DARPA. Frank is in the process of getting just credit and financial profits due. DARPA gave Boeing a $10 million dollar contract to develop the disc rotor concept.....without the aid or permission from Mr. Black. Yet another independent inventor getting the "dirty end of the stick" from the industry.
Frank is both a master machinist (Modus Recte Inc.) and a creative inventor. He has extensive experience as a rotorcraft mechanic with the Sikorsky HH-3E "Jolly Green Giant". Below is his web link that goes more into detail. I'll add to the post a bit later on.
Aerospace America: Pg. 34 discusses Franks Disc Rotor. No mention or credit for Frank.
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