Calculating Thrust for a 1.5 HP Motor: Tips for Project Hovercraft

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SUMMARY

The discussion focuses on calculating the vertical thrust required for a 1.5 horsepower motor to lift a hovercraft weighing 200 lbs. It emphasizes that hovercraft operate based on pressure rather than thrust, distinguishing them from rocket propulsion. Key factors affecting performance include the working surface area, weight, working pressure, and air leakage rates, particularly on uneven surfaces. Accurate calculations of these parameters are essential to determine the necessary power for effective hovercraft operation.

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  • Understanding of hovercraft mechanics and operation principles
  • Knowledge of pressure calculations and fluid dynamics
  • Familiarity with power-to-weight ratios in mechanical systems
  • Experience with calculating air leakage rates in hovercraft design
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  • Research how to calculate working pressure for hovercraft applications
  • Study the impact of fan blade size on hovercraft performance
  • Learn about power requirements for different hovercraft designs
  • Investigate methods to minimize air leakage in hovercraft systems
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Engineers, hobbyists, and students involved in hovercraft design, as well as anyone interested in understanding the mechanics of lift and pressure in air-cushion vehicles.

Shane
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Does anyone know how to calculate the vertical thrust of 1.5 horsepower motor? I need some calculations for a project hovercraft and am wondering how much thrust is needed to lift 200 lbs. Also is thrust affected by fan blade size? Any help is appreciated, Thanks!
 
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Well to start with a hovercraft doesn't work on the reaction principle like a rocket does, so thrust isn't the relevant parameter of merit. They work by pressure. If your hovercraft is on a very smooth surface you can get by with a small amount of power, but in real life they need quite a lot of power to overcome the leakage associated with rough surfaces. So you need to calculate the working surface of the hovercraft, the weight, the working pressure and the rate of leakage of air past the base for a given height. Then you will be able to calculate the power needed.
 

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