The Ehang 184 first drone to man!

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by Christophe » 03/02/16, 10:05

And here is the German version: the volocopter VC200

http://www.volocopter.com/index.php/vol ... 0-prototyp
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Re: The Ehang 184, first man's drone!




by Christophe » 09/04/16, 15:29

A video of the Volocopter, this one at least it has a joystick control!

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Re: The Ehang 184, first man's drone!




by Christophe » 24/01/18, 16:52

A more recent video from Ehang:

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Re: The Ehang 184, first man's drone!




by chatelot16 » 25/01/18, 13:13

I've been asking myself this question for a long time: does the quadricopter principle have an advantage compared to the conventional helicopter?

for energy efficiency a large propeller is on par with 4 propellers of equivalent total area

the quadricopter has the advantage of a simpler mechanism: propeller with fixed pitch, and not general and cyclic variable pitch mechanism of the helicopter

but in the event of lack of energy the quadricopter falls like a stone ... in the event of engine failure the helicopter pilot takes a general negative step and the speed of descent makes turn the rotor: that remains controllable until landing whatever the altitude or the failure occurs

it's called autorotation and it's part of the training of all helicopter pilots: it's much better than a parachute because the pilot can choose the place where he will land ... much better than a parachute that puts you down anywhere

the existence of this kind of drone has only one purpose: to show that it is possible to make small flying machines ... but to make a real usable flying machine you have to use the best available technique so make a small helicopter ... and there are already! whose flight is authorized

another note the highest possible position of the rotor of a helicopter allows to land without doing the tiller if it looks a little ... the position at ground level of the propellers of this drone is ridiculous ... just tolerable for the toys

Another advantage of the helicopter: to move forwards or backwards it is enough to control the cyclic pitch of the rotor, and the rotor tilts quickly without waiting for the whole of the helicopter tilts, this kind of control is therefore at the times faster and more energy efficient than a quadcopter
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Re: The Ehang 184, first man's drone!




by Christophe » 25/01/18, 13:20

chatelot16 wrote:I've been asking myself this question for a long time: does the quadricopter principle have an advantage compared to the conventional helicopter?


Cold I would say: the price, the ease of piloting, the size (we can fold the arms of a drone, the blades of a helicopter is more delicate) ... valid answer not necessarily for the four color but all drones!

A helicopter is a great machine, practically speaking, but an aeronautical disaster!

It is overpriced both for purchase and for use ... it must be reserved for special and rescue operations! Not tourism ...
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Re: The Ehang 184, first man's drone!




by chatelot16 » 25/01/18, 14:29

helicopters are expensive because the rules in force in aeronautics require high quality ... and nobody complains because it avoids accidents!

what good is it to make drones with passengers falling anyway ... as long as tinkering with light helicopters outside aeronautical standards, can be a little more dangerous than serious helicopters, but easily less dangerous than quadcopters

but we must keep our feet on the ground: if the classic helicopter is too expensive, to do better we will have to find a better solution ... the quadcopter is worse ... so if we wanted to improve the quadcopter to achieve the same reliability it would be more expensive than the helicopter

if we are content with too low reliability it cannot be used for anything in large dimensions: it can only be used in small dimensions where the danger of a fall is acceptable
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Re: The Ehang 184, first man's drone!




by Christophe » 25/01/18, 22:59

chatelot16 wrote:so if we wanted to improve the quadcopter to achieve the same reliability it would be more expensive than the helicopter


It's a bit speculative as an assertion isn't it?
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Re: The Ehang 184, first man's drone!




by chatelot16 » 26/01/18, 01:55

if you want to make a quadricopter with the possibility of flight in autorotation in case of lack of energy, you need a variable step on each propeller and a possibility to pool the mechanical power of the 4 rotor so that they all stay at the same speed during descent

it must be controllable by the pitch controls

classic helicopters are piloted either by the bell helicopter of the American helicopter, or by the articulation of the rotor blades to 3 blades of the French helico which plays the same role of gyroscope as the bell bar

with a quadricopter controllable by independent pitch control of the 4 propeller, I think it will be impossible to pilot in direct control ... electronic bazaar essential

we can also imagine a general pitch control of the 4 rotors to simply switch from normal mode to autorotation mode, and control by electronic variator which takes power on certain motor to supply other

but in any case it seems more complicated than the current helicopter ... and for what advantage?

the only advantage of the quadricopter is simplicity when you don't need security ... if you want security you might as well take the simplest solution that has proven itself
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Re: The Ehang 184, first man's drone!




by Christophe » 26/01/18, 17:16

3 other concepts in addition to the volocopter and the ehang:



SHANG 184

Introducing ehang 184, a one passenger drone which can carry up to 100kg payload and cruise at a speed of 60 kilometer per hour. The Ehang is an electric AAV (Autonomous Aerial Vehicle) with 25 minutes flight time designed to fly at 3500 meters above sea level making it ideal for medium-short distance transportation. http://www.ehang.com/ehang184/

Volocopter VC200

The Velocopter VC200 is two-seater electric aircraft that can be operated with a pilot, using remote controls or completely autonomously. With 18 rotors powered by 9 independently batteries the aircraft can go up to 100 km / h. It has a flight altitude of up to 1,980 meters and a maximum take-off weight of 450 kg. https://www.volocopter.com/en/product/

Project Zero

Sized to carry only a single pilot or to be used unmanned, it has around 10 minutes of flight. The company is hoping that within a decade, automakers would have advanced the development of electric batteries to the point that Project Zero will travel for around 100 minutes. http://www.leonardocompany.com/en/-/project-zero

Aeromobil 3.0

The Aeromobil 3.0 is two-seater flying because that transforms in seconds from an automobile to an airplane. The vehicle has maximum road speed of 160 km / h and 200 km / h of flight. http://www.aeromobil.com/

PAL-V Liberty PAL-V Liberty is a three-wheeler flying car which can reach 100 mph on the ground and can be switched between driving mode and flying mode in 5 to 10 minutes. The Liberty can climb to a maximum altitude of 3500m, and its 197bhp flying engine can propel it up to a top speed of 112 miles per hour. https://www.pal-v.com/en/



The Zero project seems to me the most promising in concept ... but I would have put 3 propellers to have a plan!
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Re: The Ehang 184, first man's drone!




by Christophe » 07/02/18, 11:50

After that of AirBus, here is the Bell Heli Flying Taxi project: Transportation-electric / lilium-the-air-taxi-drone-electric fly-t15341.html # p333894
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