Groen Jay and David (3 results)

Mass Market Paperback. Condition: Very Good +. First Printing. First edition: February 1984, stated; cover price $2.95; page edges tinted yellow; Ballantine war fiction, about helicopter assault pilots in Vietnam. The book is square and unmarked; spine creased; some blue spots to the back wrap; sleeve protected. …

Mass Market Paperback. Condition: Near Fine. First Mass Market Paperback. Near fine. Bright and attractive mass market paperback first edition. Very nice copy.

Mass-market paperback. Condition: Fair. Glued binding. Inscribed by Jay Groen on t-p. [6], 280, [2] pages. Signed by author. Cover has some wear, soiling, and is missing part at the top front corner. Some page discoloration. Groen Brothers Aviation, Inc. is an American autogyro research and development company based in Salt Lake City, Utah. The company was founded in 1986 by David Groen and his late brother Jay Groen. David Groen remains the company Chairman, President and CEO. In 2001, Time magazine listed GBA's Hawk Gyroplane as one of their featured "Inventions of the Year." The company holds three US patents and several international patents associated with their variable pitch rotor system. Following the first flight of their proof-of-concept aircraft in 1987, the company flew several larger prototype autogyros during the 1990s. In September 1999 the company flew their first piston-engine powered prototype of the four-seat Hawk 4. The turbine-engined prototype first flew in July 2000, with a Rolls-Royce 250 420 hp (313 kW) turboprop engine and was the world s first turbine powered gyroplane. First edition. First edition [stated]. Presumed First printing.…