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 BB radikaalsetest kasutusvõimalustest
We had two methods to start the powerful J-58 engines. The first and oldest method was to use the start carts. These were twin buick 455 v-8 engines, dressed out with racing cams and headers. They were coupled together to a rotating shaft that connected to the starter shaft of the engine. It took some serious rpms to start the J-58s, and it wasn't uncommon to see one break apart throwing piston rods through the engine block. In the late 80s, the buick engines were replaced by built up Chevy 454s. That pretty much eliminated our rod throwing problem. The other method to start the engines was through the use of pneumatic air. The hangers at BAFB were equipped with these systems in the early 80s, and it quickly became the preferred method. A removable turbine was attached to the engine starter shaft, and was fed by two four inch diameter hoses connected to the system on the hanger wall. The Crew Chief operated the valve from the wall location. We would still use the start carts periodically to keep personnel current, as we had to use them on the trim pad, and when at Temporary Duty (TDY) locations at times. We did use the pneumatic system off station at times, but this was quite cumbersome. It required four ground air units (-60s) to start a single engine. These four units are manifolded together, then connected to the two entry points on the starter turbines. This is the method now currently used by Detachment (Det) 2 at Edwards Air Force Base (EAFB).
http://www.blackbirds.net/u2/c_bennett/bbird-03.html ... võite sealt edasi lugeda |
| 13.02.2007 at 04:16 |
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