737-300 Engine Part II
Anyway, if you now head on over to http://www.b737.org.uk you'll find, though
a series of links, a page about 737 engines written by the people who
maintain and fly the planes. Whatever else you may learn, you'll notice
just how excited they seem by the whole thing...
"The core engine (N2) is governed by the MEC & PMC, whereas the fan
(N1) is a free turbine. The advantages of this include:
minimized inter-stage bleeding, fewer stalls or surges
and an increased compression ratio without decreasing efficiency!"
Cool, init? Without decreasing efficiency! (What's a
MEC? - Ed.) They've
also got a diagram:
First thing you'll notice is that some of the nouns are
missing; fill in the blanks:
- Low noise acoustical ____.
- Low emissions, short rolled ring coated ____.
- One piece steel ____.
- Side mounted accessory ____.
The second thing to notice is "Elliptical spinner
for improved hail/rain ingestion" - maybe my little suggestion that
CFM56-3's need water isn't so far fetched after all? (It's noticeably
quiet about how elliptical spinners can help with elk ingestion (or indigestion, even). Maybe
they can't? Maybe CFM56-3's are vegetarian? Who knows?)
The other thing you'll notice, especially if you
continue down the page is the difference between
my diagram, their diagram (above) and the
actual picture of the engine's internal organs. (Labelled "The left hand
side of the CFM56-3" - at least the pilots and maintenance engineers know
what the d*mn things are called.) Does either diagram have a starter? A start
A CSD? Nope...
Onwards to the 737-300 engine, part III.