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July 9, 2014

By hovercraft.org

Hovercraft Engines

Hovercraft Engines

Personal Hovercraft Sales

Hovercraft Engines  – whereas larger commercial hovercraft might be diesel, smaller recreational hovercraft tend to have high power, low weight petrol engines.

Hovercraft Engines

Hovercraft Engines

If you plan to buy a personal hovercraft, or hovercraft for any other application, here are a few points to consider:

Hovercraft are weight sensitive vehicles, so configuring a hovercraft with a heavy powerful engine will be counter-productive.

Some claim that 2 stroke engines are noisier than 4 stroke engines, but most hovercraft noise is generated by the tips of the fan blades – the air rush from the blades generally drowns out the engine noise.

Larger ducts pass more air through the duct, so are more efficient than smaller ducts.

A Hovercraft manufacturer can angle the hovercraft’s fan blades according to available power – the higher angle blade will push more air through the duct than a less angle, for example, an angle pitch of 37.5 pushes more air through the duct than one set at 32.5 degrees. This means that more powerful engine can rotate the blades at a slower speed to generate the same air throughput; which is good because the higher the rotation, the greater the noise generated by the fan tips. A more powerful engine can therefore run more quietly than one rotating the fan blades at full pelt, and slower engine revs will consume less fuel, extending the operating range of the hovercraft.

Ducts should be clear from obstacles for best efficient air throughput, although that said, it pays to have the duct fans fully guarded front and rear – some hovercraft don’t guard the rotating fans that swish round at 2,000 rpm – a couple of self build enthusiasts have been injured (one killed in NZ) by unguarded fans, so for safety sake, especially where there are children around, make sure the hovercraft fans are properly guarded.

Some personal hovercraft suppliers leave off the rear guard, and modify their engines to extract every last ounce of power – this invalidates an engine manufacturer’s warranty, since no engine supplier wants their engine to run in full stress mode all day.

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