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In lugnet.technic, Ka-On Lee writes:
> In lugnet.technic, Adrian Drake writes:
> > Probably not. It would be completely impossible for me to Ldraw all the
> > wiring, tubing, and flex cables. If the inspiration strikes me, I might be
> > able to do part of it, though it's unlikely.
>
> It would be great if you just show the detail of the flightstick part by
> photo or LDraw. Your A-10 is the Technic model of the year!
Here's a description of how the flight stick works:
The stick itself is mounted in a 4x4 box with a couple of small crown gears
in it. When the stick is pushed forward and back, the crown gears rotate
and the axle that exits out the back of the box rotates with it. This then
goes down and out the back next to the differential. The differential
itself rotates for this motion.
When the stick is pushed left and right, the entire box rotates around its
centerline. This moves the axle that exits out the front of the box.
However, it also moves the axle out the back (the one that controls the
front-back motion), and this extra motion is undesirable. The differential
subtracts the front-back motion from the left-right motion. How this is
accomplished is in the magic of the differential. As long as the two inputs
to the differential rotate in equal and opposite directions, the
differential doesn't move, thus the front-back motion is cancelled it. It
really is remarkable to see work.
Meanwhile, the rudder pedals are mounted right above the geartrain for the
left-right motion (you can't see that geartrain, it's buried in structural
work). The crown gears keep the two pedals rotating in unison, and that
output goes down and underneath the differential, where it picks up with the
front wheel gearing to make that work. All the 24 tooth gears you see
sticking out the side belong to the rudders. The flightstick mechanism is
entirely self-enclosed in a space that's 6 studs wide, 10 studs long, and 4
rows tall.
Here are a couple of extra pictures:
http://www.brickfrenzy.com/images/technic/a-10/dcp01752.jpg
http://www.brickfrenzy.com/images/technic/a-10/dcp01754.jpg
Also, the larger and more complicated version of the stick was l-drawn by
Eric Brok of Lego on My Mind. You can see that here, and get a better idea
of how the gearing works there. Once you build one, you can really see a
lot better how it works:
http://homepages.svc.fcj.hvu.nl/brok//legomind/insights/index.htm
Adrian
--
www.brickfrenzy.com
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