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Assembling the mainshaft
Yoweee - Now we can start to actually assemble the complete
mainshaft to create the rotor head.
The first thing is to check the mainshaft over to
ensure it is OK to use. I suggest you give it a quick rub over
with some fine wet & dry paper, maybe 600 grade or similar to
ensure that it is really nice and smooth. Then also roll it on a
piece of glass or similar flat surface to make sure that it is
totally straight. Then clean it carefully to ensure no grit or other
contaminant is on the surface of the mainshaft.
Finally, take a ruler, or vernier calipers if you
have them, and measure the distances in each direction from the
centre locating groove you can see in the picture above. You will
find that one end is shorter than the other.
THIS IS IMPORTANT,
as the LONGER END goes down through the main bearings into the
body
of the helicopter, while the SHORTER END is where the rotor head is
fitted.
Pick up the head assembly you have just
completed and slide the SHORTER end of the mainshaft up into
the head just far enough so that you can see the hole in the
top of the mainshaft which is where the fitting bolt is
going to go (Commonly known as the "Jesus Bolt"
for fairly obvious reasons - if it ever comes out in
flight). Push the fitting bolt through the main head case
and the hole in the mainshaft, fix the nut to the other
side, and after adding thread lock, tighten it down as
tightly as you can without shearing the nut or bolt.
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The rotor head fitted
to the SHORTER
end of the mainshaft |
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Next we need to slide the washout hub we assembled
earlier up the mainshaft. Check the picture on the
right and ensure that you have the washout arms
pointing in the same direction.
The drop arms always
have the bend TOWARDS the direction of the head
rotation, which in our case is clockwise. |
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Note how the washout
hub slides up OVER the single anti rotation pin.
IMPORTANT -
Recheck to make
sure that the bell crank shaped drop arms are
pointing forward in the same direction as the
rotation of the rotor head (clockwise) |
| Now push the swash
plate up the mainshaft (note which way up it fits)
and slide it up underneath the washout hub assembly.
Connect each drop arm to a ball on
each side of the INNER swash plate connectors.
Move the swash plate around in all
directions to ensure that the ball joints are moving
nice and easily. You may need to
"ease" the plastic links a little if they
are too tight. A ball joint reamer is the best
tool to do this with. These
must be as free as possible |
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Take the mainshaft
collar and slide it up the mainshaft until it is
over the groove in the shaft. Fit a grub screw
and tighten it up
just enough to pinch it in place for now to ensure
the swash plate cannot slide down the mainshaft too
far. |
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This is what the
complete head should be looking like now...
(without the connecting rods fitted)
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