Subject:
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Re: Helicopter
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 3 Feb 2005 22:34:58 GMT
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Viewed:
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11590 times
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In lugnet.technic, Pierrick Puchois wrote:
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Hi Ross and many thanks for your support !
I also thought about using specific Technic “swashplate”, but I concluded as
you did : collective control could’nt be achieved because of friction. So
keeping the large technic turntable was the best way...
...
Regards,
Pierrick.
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I have used the Technic swashplate in a 1:20 scale Apache helicopter, including
collective and differential pitch control. The scale is about right for Technic
figures.
I modded the splined ball by filing the axle hole a bit so that it would slide
along the axle.
The pitch control was done by lever addition of the collective and differential
pitch, each one feeding one end of a lever (a 5L Technic plate)and the centre of
the lever pushing the swashplate. The swashplate has all four ball joints used.
I used wishbones for strength.
I used rotary transmission from the joysticks and collective pitch lever to the
rotor assembly, using crankshaft parts to turn that into the vertical movement
for the levers. To save space in the rotor assembly, I modded some parts in the
crank mechanisms.
In 1:20 scale the rotor blades are about 1m long each, so they droop when not
rotating! My intention was to use two 12V train motors to power the rotor,
since that would give 16W maximum power, but now an RC car motor might do
instead.
I used significant amount of parts to ensure that the heavy blades would not fly
off when rotating! The pitch of each blade is received on steering parts with
one ball joint and two socket joints.
The rotor works quite well, though putting a differential pitch on the blades
(changing angle during each rotation) puts significant load on the motor.
Changing the controls too quickly can cause the mechanisms to fail, but slow
movement over the full range works well.
Sorry, I don’t have any pics online as I took them in 1997! Sadly, I haven’t
finished the helicopter since then, having done more trains instead, but I don’t
rule it out for the future.
The tail rotor collective pitch mechanism works too. It is made from plates
with clips, since technic parts were too bulky. I’ve yet to connect the rudder
pedals to it with flexes though.
Mark
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Message is in Reply To:
 | | Re: Helicopter
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| Hi Ross and many thanks for your support ! I also thought about using specific Technic "swashplate", but I concluded as you did : collective control could'nt be achieved because of friction. So keeping the large technic turntable was the best way... (...) (20 years ago, 3-Feb-05, to lugnet.technic, FTX)
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