#URBAN AIR MOBILYTI #AIR TAXI #EVTOL #FLYING CAR
There are currently +270 VTOL designs . Is that really so ?
5 years old design
How many current VTOL's able to do multi missions ? Answer is 1 - helicopter .
Jetcopter - modern helicopter .
Why some investors void to invest to URBAN AIR MOBILITY ?
Why eVTOLS will fly in 20 years ?
they don't have batteries they need - very powerful and very light .
Get on skyscraper top , feel the winds power there , the same moment you will strongly dislike any eVTOL with max flight time 10-15 min. To be able to resist strong winds , not to lose control in the air , eVTOL will need a lot more energy than present eVTOL's can handle.
Presently no any eVTOL developer demonstrated any appropriate flights , only posted short videos with take off and landing straight after. They will take long time for developing to hope new kind ''miracle'' batteries will appear till that time .
to lift 2500 kg - 4+ seats vtol multicopter need min 700KW , max flight time with it 15 min .
Who will want to fly eVTOL with 1000 kg very dangerous and flammable LITHIUM ? In case of crash firefighters will not be able to extinguish fire of 1000 kg Lithium for long time. So many TESLAS burned , Lithium batteries packs in ban by general aviation , who wants to be near 1000kg lithium in air ?
What we know about batteries ?
If you will try your TESLA at full power , how long it will go ? Max 30-40% from declared...Check engineering explained how Tesla have no power even to tow small trailer .When you use battery on the ground , bearings take biggest part of gravity on them , so almost all power goes to move car forward . In the air there are no bearings , you must overcome your gravity force + have power to push airplane forward.
must have 15 min reserve x 700 kw = 500 kg lithium
flight 15 min = 500 kg lithium
so total for 15 min flight +15 min reserve need 1000 kg battery
EASA evtol certification task : battery dropping from 15 m height to the ground - must be no leaks .
Its like to drop 1000 kg battery from 5th floor and expect no damages ...? This way battery could blow , not just leak .
Aviation experts have same opinion about eVTOLS - it's very doubtfully to believe that they will be able to lift more than 1 passenger. Lifting just 1 pilot + 1 passenger for very short time and slow speed ?
Too many VTOL startups rely on electric motors as this is easiest way to engineer a VTOL - just put powered propeller at place you want . Reality is different- Tesla battery that drive car 500 km , in air it will keep VTOL max for 15 min ( reserve only) . So even you will use such 500 kg battery , you still won't get enough range . You need to use 2 of such batteries - 1000 kg (batteries only )for 15 min flight ...
* Why not helicopters ?
helicopters are perfect machines when you need long time hoover above one place , but they very inefficient in horizontal flights , are very complex , slow , expensive and dangerous. 12 m diameter rotor blades are very dangerous in crowd areas , helicopters can't fly near buildings , pilots are tired after 2 hours flight , helicopter pilot licence hard to get . Also last tragic event in LA showed again - helicopters unsafe .