The LPT is not physically connected to the compressor; only to the prop
gearbox. The pitch control unit routes oil through the Beta tube to the prop
to set it to feather. Since the LPT isn't connected to the HPT or the
compressor, it can turn at a much slower speed. That is the reason the
engine spools up faster than the T-56 also. If you're doing a man on the
stand you apply a bit of reverse pitch because in hotel mode you still have
some prop blast.
Steve R.


"Bob Urz" wrote in message
...


Henry J Cobb wrote:

Bob Urz wrote:

How does "hotel mode" work?


http://www.codeonemagazine.com/event..._events33.html
Hotel mode, a unique capability of the C-130J propulsion system that
provides for safer ground loading and unloading operations, was
demonstrated in recent tests at MCAS Cherry Point, North Carolina.
This capability puts the C-130J propellers in feathered position,
which reduces both propeller blast and engine exhaust heat and,
consequently, the amount of dust, dirt, and debris being kicked up
behind the aircraft. The engines remain running in this mode enabling
the pilot to spool them quickly up to military power.

-HJC

I saw what it does already, i was more curious on how.
I have visions of a large clutch pack or such.
That could be a potential failure mode. I am curious
mechanically how they do it.

Bob




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