Energy of Fan Blade: Calculating Speed and Strength

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SUMMARY

The discussion centers on calculating the energy of a fan blade designed for a small hovercraft built by Universal Hovercraft, powered by a 5hp petrol motor with a maximum RPM of 3000. At this RPM, the tip of the fan blade reaches a speed of 339 km/h (210 mph), while the inner root achieves 169 km/h (105 mph). The primary inquiry is about the energy of a 200-gram pine blade if it were to detach at these speeds, referencing the concept of rotational energy for calculations.

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  • Understanding of rotational energy calculations
  • Familiarity with fan blade dynamics
  • Knowledge of hovercraft mechanics
  • Basic physics principles related to speed and mass
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Engineers, hovercraft designers, physics students, and anyone interested in the mechanics of fan blades and their energy dynamics.

Colin De Bruy
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Thanks to all who posted. The fan was built by Universal Hovercraft it's purpose built for a small hovercraft designed for kids to ride on. The fan is driven by a 5hp petrol motor which has a top rpm of 3000 rpm. I doubt the engine will get to this rpm with the fan attached but at 3000rpm the tip of the fan is doing 339km per hour or 210 mph and the inner root of the blade is doing 169km or 105mph. So does anyone know how much energy a 200gram pine blade has if it were to break off at this speed? Many thanks Colin
 
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