○ reliable and economical four
stroke TOYOTA engine with electronic
○ very stable and safe thanks to permanently pressurized ring with 700
○ passengers cabin for 3 adult persons (in-line), separated from engine
○ separate fans for lift and thrust -
details. SEE VIDEO
SEPARATE LIFT SYSTEM One engine and one fan is a simple design but a great
source of noise.
That is because of two contradictory functions:
To generate the thrust we need large air flow [20-30 m3 / s] *
but without the pressure [Pa].
To generate the lift we need pressure [600-1000Pa] *
at low flow [4-8 m3 / s] *
Both functions require different parameters and settings of the fan.
If there is only one fan it works at low efficiency ~ 50-60%.
In this case 50-40% of engine power turns into noise!
If you want to build or buy a quiet hovercraft, it must have two
separate fan systems and a good four-stroke engine. Additionally
four-stroke engines have
30% lower fuel consumption in comparison with two-stroke engines.
*-for the 2-3 person hovercraft See for more info