Frisbee

This wasn't an easy ride to build.
The swinging mechanism caused me a lot of trouble.
I used a non-lego switch to change the spinning direction
of the upper motor automatically on the turning points.
This worked fine without the gondola. But when I connected the
gondola to the boom it was so heavy that the switch turned only
half the way and cut the power.
Then I tried to use the gondola as a flywheel to make the boom
rise a bit higher than the critical point. It didn't work.
Then I changed the switch to a normal on-off switch and used
a relay to change the spinning direction of the motor.
When the switch is on the boom goes right.
When the switch is off the boom goes left.
A problem again: when the switch goes off the boom starts to go
left but the switch hasn't locked to the OFF-position. So it
goes ON again and the boom starts to go right which causes the
switch to go OFF and boom to go left and so on... So the boom
shakes on the other end until the whole trailer falls to pieces.
In order to keep the power on 0.5 extra seconds (so that the
switch will lock to the OFF-position) I used a capacitor.
I made some tests and find a perfect capacitor for that.
It's 220 uF. It's quite big so I put it in the ticket booth.
The ride worked couple of swings and crashed. I made the weakest
point stronger. It worked a little longer until it crashed again.
This way I continued to eliminate all the weak points.
NOW IT FINALLY WORKS!




























I found this picture in the net. If it's yours and you
don't want it to be here just e-mail me and I'll take it away.


Photo by Markku Jaaskelainen at Tampere, Finland 2000


Photo by Markku Jaaskelainen at Tampere, Finland 2000