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This was the third model of the winner entry for the TRIPLE contest, hosted by www.eurobricks.com.
More about the contest here:
-wind up propulsion, or towing
-can be rolled up
-part count: 495
-size: 36,5 x 23,2 x 10,5 cm (without rear spike)
The winding-up works by pulling an axle which makes the wind-up gear mash with the gear of the main drive shaft. Rotating the axle adds energy to the pullback motor. By pushing the axle back, the wind-up gear releases the main drive shaft and the model starts moving.
More pictures can be found here.