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The Tail Driven Gear
We are now going to assemble and fit the tail
driven gear, which is what drives the rubber belt that in it's turn
drive the tail rotor blades.
You need to be a little careful here, as it is
quite easy to get the order of assembly wrong, so please pay
attention carefully
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All the parts for the tail
driven gear come in a single bag as shown on the left. |
| Shown below is the
correct order for the assembly of the tail driven gear.
In particular, you will
need to ensure that the two large plastic bearing holders
are fitted the correct way up in both cases, or the assembly
will not fit into the frame correctly.
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Take one of the bearing
holders, and push a bearing into it firmly so that it is all
the way down into the recess provided for it.
Next, push the tail driven gear shaft down
through the bearing FROM THE TOP with the gear
downwards. Take care not to push the bearing back out
of the holder when doing this.
Take the small circlip and fit it into the
groove you will find right under the bearing on the BOTTOM
(left in this picture). Ensure the circlip is securely
fitted in the groove. |
Picture on the right shows
the
circlip fitted correctly
Make sure the circlip does not fly off
when you are doing this, or you may not be able to find it
again.
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Now push a bearing into the
other plastic bearing holder, and slide it down over the
tail driven gear shaft so that the bearing is on the very
top.
Double check - look at both bearing
holders, you should be able to see that the bearings can be
pushed into each one from the OUTSIDE if you have them
fitted correctly.
Also note that the tail driven shaft has
TWO FLATS on the top end of it. |
| Now take the top white plastic
gear, and push it down over the top of the tail driven
shaft. Make sure that you align the flats in the gear
with those on the shaft, and push it down as far as it will
go. |
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Now take the other plastic
"lip" of the top gear and slide it over the shaft
as shown on the left.
Make sure you get it the right way up,
with the totally flat side upwards. |
| The final step is to add the
washer and nylock nut. Pull the nut down securely, but do not over tighten it.
Check to make sure the shaft rotates nice
and freely.
On the right is the completed tail driven
gear. |
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