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 - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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