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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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