Through this project, our goal was to demonstrate an understanding for the concepts of pressure, Newton’s Laws, Bernoulli’s Principle, volume flow rate, efficiency, power, potential and kinetic energy, and work. It provided a summation for most of the topics covered in this course. II. Materials ?Craftsman Leaf Blower (220 mph, 120 V, 12A,8 lbs. ) ?? ’’ Plywood (75 lbs. ) ?Milk Crate (3 lbs) ?Spray Paint (12 oz. ) ?Blue Tarp ?Staple Gun ?HVAC Duct Vent Piping ( 2. 5 ft. ) ?Duct Tape ?Coffee Can Lid ?3/8’’ Carriage Bolt ?Jigsaw ?Utility Knife
III. Procedure 1. First, we gathered the supplies. 2. Then, we cut out the plywood hovercraft body with a jigsaw, and drilled out a hole in the center for the bolt. 3. Next, we sanded down the body to prevent the tarp from tearing. 4. Then, we aligned the tarp then mounted it using staples and duct tape. 5. The carriage bolt was put in place to secure the coffee can disk to the underside. 6. After that was secured, the vent holes were cut out on the underside. 7. The leaf blower was then attached and fitted to the HVAC pipe leading into the tarp. . A milk crate was added to prevent the leaf blower from shifting out of position. 9. The hovercraft was painted Whaler red and white. 10. The hovercraft was then tested, and it resulted in a success. IV. Calculations Operator’s Weight = 150 lbs. Average Distance of Hover = 68. 46 ft. Inflation Time = 2 seconds Hover Time = 11 seconds Acceleration of Inflation Time: Force of Weight: Operator’s Velocity: Power of Vehicle: P=v*I V. Analysis There were very few issues that arose during this project.
One of the issues dealt with the amount of air flowing out of the hovercraft. We were forced to seal and redesign the underside of our craft to create an air cushion that was better suited for flight. The only other issue that was brought forth, was that the operator had to adjust his riding position to focus the majority of his weight into the center of the craft. Other than these minor problems, the remaining components of this project provided us with a hands-on learning experience for the concepts presented in this course.
Conclusion: After conducting this experiment, we discovered that our hovercraft was efficient in terms of work in versus work out. Another finding was that due to the higher pressure inside the tarp and low pressure outside the tarp, the craft lifted off the ground. We noticed that by using a HVAC pipe with a 4 inch diameter, the volume flow rate was more than using a pipe with a 2 inch diameter. This increase in volume flow rate lead to a higher lift off the ground.