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Post by stoffe64 on May 12, 2011 14:04:05 GMT -5
look here what a difficult engine to start,it sorta overheats and then they throttle back and then throttle back up again until it selfsustained...hope they didnt damaged the turbine. wn.com/Allison_J33 |
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Post by ernie wrenn on May 12, 2011 14:09:48 GMT -5
looks and sounds like air in the fuel line. Had that problem until we moved the fuel booster pumps. unit would cavitate fuel until it finally got a good gulp.
ernie
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Post by stoffe64 on May 12, 2011 15:27:16 GMT -5
aha...thats why it acts so strange that J33 engine, one can hope that the turbine survived
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Post by ernie wrenn on May 12, 2011 16:25:08 GMT -5
They are tough birds... will last forever. figure each one of the burn tube is independent and if something crazy happens, a few bolts and your ready to go again.
ernie
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Post by Johansson on May 12, 2011 23:38:00 GMT -5
Those lazy yellow flames at low rotational speeds aren´t hot enough to damage the turbine blades, it is the flames at higher revs that tend to melt things.  You can see that the blades in the video aren´t even glowing during the first part of the startup despite the flame show, but once the engine is starting to pick up speed even the slightest flame makes the turbine blades cherry red. |
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Post by stoffe64 on May 13, 2011 9:07:23 GMT -5
yes atfirst it didnt became so hot but it seemed so unwilling to light up properly and finally you could see the egt probes started to glow and such.
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