3 ms·

50kw is still an incredible amount of power to transmit wirelessly without cooking the target and anything that may pass between the power transmitter and the t

50kw is still an incredible amount of power to transmit wirelessly without cooking the target and anything that may pass between the power transmitter and the target. Go put an egg in your microwave and watch what 1kw does to it. It would also almost certainly require line of sight and a directional antenna that can track the aircraft. Batteries could be used in the aircraft to at least land safely if there were a loss in power. But currently we have trouble transmitting 5 watts across the 7mm gap between a wireless charger and a phone. 50kw over a distance of 1-300km is a very long way away.

FabHK 10y ago
Thanks. (Note that I think the wireless transmission idea is entirely fanciful and can safely be discarded for the foreseeable future. Just got hung up on the 100 kW figure...)
- sathackr 10y ago
  It may need 100kw during certain phases of flight --take off and landing for a VTOL craft, or just take-off for a standard aircraft. Cruise power is generally far less than take off/hover power. If the craft were entirely wirelessly powered, then of course the system would have to be able to transfer 100kw. But the link(if even 50kw were ever feasible) could be designed for a lower power level, and the aircraft could draw from an onboard battery bank for extra power during these phases of flight. Kind of like how hybrid drive vehicles undersize the internal combustion engine and then draw power from the ICE and the electric system during heavy acceleration. But we still need to find a reasonable way to wirelessly transmit large amounts of power safely and efficiently.
  - pdelbarba 10y ago
    100kW is the likely cruise power for that aircraft at 300kmph. It's likely many times that for VTOL
    - sathackr 10y ago
      Very possibly. I'm by no means an aerospace engineer. A quick google turned up this[1] which has a top speed of 296km/h with a 120hp(89kw) engine, and it's likely a good bit lighter than the Lilium with a full battery load. [1] http://www.aircraftspruce.com/catalog/kitspages/nexaer.php http://www.aircraftspruce.com/catalog/kitspages/nexaer.php edit: added [1]

FabHK 10y ago

Thanks. (Note that I think the wireless transmission idea is entirely fanciful and can safely be discarded for the foreseeable future. Just got hung up on the 100 kW figure...)

sathackr 10y ago
It may need 100kw during certain phases of flight --take off and landing for a VTOL craft, or just take-off for a standard aircraft. Cruise power is generally far less than take off/hover power. If the craft were entirely wirelessly powered, then of course the system would have to be able to transfer 100kw. But the link(if even 50kw were ever feasible) could be designed for a lower power level, and the aircraft could draw from an onboard battery bank for extra power during these phases of flight. Kind of like how hybrid drive vehicles undersize the internal combustion engine and then draw power from the ICE and the electric system during heavy acceleration. But we still need to find a reasonable way to wirelessly transmit large amounts of power safely and efficiently.
- pdelbarba 10y ago
  100kW is the likely cruise power for that aircraft at 300kmph. It's likely many times that for VTOL
  - sathackr 10y ago
    Very possibly. I'm by no means an aerospace engineer. A quick google turned up this[1] which has a top speed of 296km/h with a 120hp(89kw) engine, and it's likely a good bit lighter than the Lilium with a full battery load. [1] http://www.aircraftspruce.com/catalog/kitspages/nexaer.php http://www.aircraftspruce.com/catalog/kitspages/nexaer.php edit: added [1]