![]() ![]() To investigate this we will measure the range of the propeller car with both the large and small propellers for different numbers of turns of the propeller ( N). The more times you wind the propeller, the more energy you store and therefore, the further the car should go. ![]() When you wind up the propeller, you are storing energy in the rubber band that is released when you let the car go. Now you are ready to make some measurements of propulsive performance. Finally, find the mass of the vehicle with each propeller using the scale or balance. Using the measuring tape, measure the radius of each propeller and record the measurements. Using the scissors, cut off the outer 2 cm of each propeller blade on the second propeller (or the propeller on the second car if you have two car kits). When you are finished, they should look something like the pictures shown below: Be careful to follow the instructions carefully. In this activity we will use a rubber band powered propeller car to understand some of the key characteristics that affect the thrust and efficiency of propeller propulsion.Ī rubber band powered propeller car Īssemble the car according to the instructions included with the kit. The shape of the airfoil and size of the propeller are carefully selected so that the propeller provides the required thrust with a high propulsive efficiency. In the Design section we learned that propellers generate thrust by rotating an airfoil in a circle which generates thrust by accelerating fluid backward away from the propeller. ![]()
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