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Sets 42010 and 42011 feature a pull-back motor. They have a very high torque for a very small numbers of turns, they then free-wheel.

I'm trying to find alternate usage for them. That is anything but connecting them directly to the wheels without gears, as putting any gear demultiplication is great while the motor is turning, but it quickly prevents the vehicle moving when free wheeling.

What I've managed to do so far:

  • Using it to launch a spinning top
  • Launch a rotor blade

Anything else ?

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up vote 5 down vote accepted

Yoshihito Isogawa made clock mechanisms from it (well... tic-tac generators) and

Majorna created a "programmable" pull back racer

...and another clock by neomomonga:

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The clock ! that's obvious now that you mention it ! – Stephane Delcroix Dec 4 '13 at 10:12

Just today I tried to use it quite successfully as an alternative to suspension springs. Right now I don't have it assembled so I can't post a screenshot, but the idea is to wind up the pullback motor then attach it to your construction with a cross axis from one side and beams from another and limit its moving with some details. If you are interested in how I have done it, I will assemble it to demo and post images.

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An interesting application to be sure :) – Zhaph - Ben Duguid Jun 10 '14 at 11:53

Once I built a hand-powered semi-automated screwdriver toy for kids. They needed to "charge it" first by rotating a gear and then push a button to release power. Then they could apply it to a crane or other models.

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Build a catapult with it. The catapult arm would be attached to the motor. Pulling the arm down will wind the motor

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