Its a little more complex than that. Vehicles (cars, trucks) can rely on the engine power being transferred to a high friction surface (the road) with help from gravity with immediate effect. Where as boats and aircraft are transferring engine power to a low friction medium (air and water) where gravity is important for aircraft otherwise you die when you hit the ground unless you can auto rotate in a helicopter or glide in a plane, but where gravity is not so important in the scheme of things, if those extreme risk situations are catered for.
I bet they could have got the costs down more if they had used a Toroidal Propeller.
Here (already cued for you) https://youtu.be/s_J1OYcCPms?t=23 the footage shows less vortices generated with the Toroidal propeller seen in the top half of the frame of the two boat propeller underwater.
Its these vortices in water which generate cavitation on a traditional style propeller, which leave little pits on the surface of the propeller eventually leading to its replacement as its surface contributes to more friction and thus less fuel economy.
If the friction from the pitted surface is ignored, then it can lead to parts of a blade becoming more like swiss cheese with holes that results in parts of the blade breaking off.
Wind Turbines could generate more electricity if they used toroidal blades, but currently the engineering skill does not exists to scale these blades up in size, and have the ability to "detune" a blade in gale force/storm force winds to minimise damage to the generators and the unit itself.
However the use of these wind turbines also means, the state have a stealth population control mechanism as these wind turbine blades can also be altered to generate plenty of infrasound which can be used to make large parts of the population in the vicinity feel anxious, something that's documented in the Disney sound engineering labs in the 40's/50's when the sound engineers inadvertently made themselves all feel very ill for a few days. Ergo you will probably see less people striking in future!
I bet they could have got the costs down more if they had used a Toroidal Propeller.
Here (already cued for you) https://youtu.be/s_J1OYcCPms?t=23 the footage shows less vortices generated with the Toroidal propeller seen in the top half of the frame of the two boat propeller underwater.
Its these vortices in water which generate cavitation on a traditional style propeller, which leave little pits on the surface of the propeller eventually leading to its replacement as its surface contributes to more friction and thus less fuel economy.
If the friction from the pitted surface is ignored, then it can lead to parts of a blade becoming more like swiss cheese with holes that results in parts of the blade breaking off.
Wind Turbines could generate more electricity if they used toroidal blades, but currently the engineering skill does not exists to scale these blades up in size, and have the ability to "detune" a blade in gale force/storm force winds to minimise damage to the generators and the unit itself.
However the use of these wind turbines also means, the state have a stealth population control mechanism as these wind turbine blades can also be altered to generate plenty of infrasound which can be used to make large parts of the population in the vicinity feel anxious, something that's documented in the Disney sound engineering labs in the 40's/50's when the sound engineers inadvertently made themselves all feel very ill for a few days. Ergo you will probably see less people striking in future!