How do you make a car powered only by a fishing weight abd gravity that is made fro
Posted 09-27-2009 at 07:43 AM by rparma
How do you make a car powered only by a fishing weight and gravity made from things around a house and is only 30cm x 30 cm.......i can make the car but am having trouble making the car move by the weight
Total Comments 1
Comments
-
You've asked this question before, haven't you?
This is a very easy problem to solve. First, make the entire "car" very light. A square of heavy cardboard, 25 cm on a side, will do for the "body. Mount two pair of wheels underneath -- each pair of wheels should attach to the ends of a common axle, say a really stiff piece of metal wire, 30 cm long and 1 mm thick. Three or four wooden dowel rods can be glued on top the cardboard to make a "teepee" about 40 cm high, with a freely rotating pulley on top.
Put another pulley on the rear axle wire -- put it in the center of the wire, and cut a hole in the cardboard over it, so the two pulleys can "see" each other.
Wind 40 cm of nylon fishing line around the rear axle pulley, then up through the hole and over the pulley at the top of the "teepee". Trim the line to give you another 2 cm of length past the top pulley so you can tie it to a heavy fishing weight.
When you allow the weight to hang from the top pulley (under its own weight, so to speak), the weight will slowly drop down, turning the rear axle as it does so. This will make the "car" move forward.
Notes: the pulley on the rear axle should be smaller than the wheels. It should NOT spin freely on the axle.
Don't tie the nylon line to the rear axle pulley. That way, as the weight falls and hits the floor, the line will come loose, and the "car" will continue coasting.Posted 10-05-2009 at 01:06 PM by Pyrotex
