rahulmuntha Posted March 13, 2014 Report Posted March 13, 2014 plzzz helpi have to make a rubber band powered car which should travel 75cm in straight line and have to turn left/right and should travel some distace Quote
Turtle Posted March 13, 2014 Report Posted March 13, 2014 plzzz helpi have to make a rubber band powered car which should travel 75cm in straight line and have to turn left/right and should travel some distace Have the powering rubber band wrap around a stretched spring or another stretched small rubber band so that when the powering band unwinds enough, the trapped spring/band is released. Have that released band act on a lever or rod that then pushes against one of the front wheels, causing that wheel to slow, and so causing the car to turn. Let me know if you need more help and by all means post pics or results of your final project. :) Quote
rahulmuntha Posted March 13, 2014 Author Report Posted March 13, 2014 Have the powering rubber band wrap around a stretched spring or another stretched small rubber band so that when the powering band unwinds enough, the trapped spring/band is released. Have that released band act on a lever or rod that then pushes against one of the front wheels, causing that wheel to slow, and so causing the car to turn. Let me know if you need more help and by all means post pics or results of your final project. :) Quote
rahulmuntha Posted March 13, 2014 Author Report Posted March 13, 2014 plzz can u just elobrate and post a rough picture of ur idea Quote
Turtle Posted March 13, 2014 Report Posted March 13, 2014 plzz can u just elobrate and post a rough picture of ur idea Sure. In the attached drawing the Green rubber-band #1 drives the car forward by turning the Orange capstan which is attached to the rear axle which is attached to both rear wheels. The front wheels each have their own axle. The Green rubber-band #2 is attached to the angled Yellow stick which is free to move forward and back. When the Green #2 pulls the Yellow stick forward, it drags on the right-front wheel causing the car to turn right. The Red string is attached to the Yellow stick and pulls it back & stretching rubber-band #2, and the Red string is then wrapped under part of rubber-band #1 on the capstan as the car is wound up. The Yellow stick is now held off the wheel. When the car is let go it drives straight as rubber-band #1 unwinds from the Orange capstan. When rubber-band #1 unwinds off the Red string, it lets Red string go and rubber-band #2 pulls Yellow stick forward to drag on the wheel. Quote
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