Posted by KIP in MX on December 04, 2011 at 13:22:08 from (190.213.18.249):
My weekend in Trindad, West Indies has been removing and installing a Pratt & Whitney Twin-Pac engine in a Bell 412. The power sections are 900 shp ea connected to a combining reduction gearbox dropping turbine rpm from 36,000 to 6600 at the output shaft to the helicopter's planetary transmission where rpm is further reduced to 324 rpm at the main rotor. Although the Twin-Pac has 1800 shp output, the transmission is limited to 1400. Cost for the complete Twin-Pac is close to 1 million US.
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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