No sound like the General Electric J-79 Gas Turbine, model GB101(civilian rendition LM1500...Land & Marine). As the Compressor spools up, whine of the starter, variable inlet guide vanes closed. At some point around 1500 RPM twin igniters arc. The sound of thunder as the fuel air mix is ignited. As the CIT sensor and feed back cable operates the variable geometry, the starter stays engaged until G.G. is at some point around 3000 RPM. T1 temperature starts to drop (ambient inlet),T2 temperature climbs and T3 approaches 1100 F as the fuel control pushed the innards towards 1500+ HP! The scavenging oil approaches 200 + F. The scavenging oil pump located in insulation in the AFT bearing frame starts to heat up like a barbecue! At -40F the Combustor casings glow Reddish Blue and heat emanating from the combustor aft is like non other. As the heat penetrates the PT foils (Blades) the foils growth is so extreme they seem to have zero clearance to the honeycomb seals that ensure all heat must pass through the PT!
Check out.... S&S TURBINE on the NET....I dawn coveralls at their test cell from time to time:
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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