Not sure that immediately makes sense to one way or another, sounding a bit weird! This is very new stuff for me. If the prop is, as it seems, hydraulically acting towards fine pitch, then the coarse pitch will empty it of the oil, if I get it.torejohs wrote:Check shutdown procedure here, this guy at least explains that he runs it at 1500 rpm for a while to scavange oil, then the'll pull the prop back to fill the prop's oil cylinder to prevent rust. I'm assuming he's talking about the guvernor?
Quickly checking the procedure, and indeed, according to some T-6G FM I've got at hand this quick, his method apparently is subtly wrong way around:
As in, pull the prop back before waiting the engine to scavenge. That way, running up the engine, pulling back the prop and then letting the engine to run some time the scavenging thing would actually make sense. Filling the prop's cylinder seems to me be a misunderstanding on the way it works, as that would be how a common single GA functions but apparently not the T-6.AN 01-60FFA-1 Section II wrote:STOPPING ENGINE
[...]
2. Open throttle to approximately 1450 rpm, place propeller control in full DECREASE, and allow engine to run for approximately one minute to allow the oil from the propeller to be scavenged back to the oil tank.
But as said, I've only just opened the books on it. It will be a long and interesting journey to me, as I've got no real idea how those radials are made up!
-Esa