Aircraft

Heavy-lifting, long-range hydraulic uUAV multirotor flies into production

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Prototype testing for the FC100 heavy-lift utility UAV has now ended, and Flowcopter has frozen the design to enter production
Flowcopter
Prototype testing for the FC100 heavy-lift utility UAV has now ended, and Flowcopter has frozen the design to enter production
Flowcopter
Successful flight tests of the FC100 heavy-lift utility UAV were recently undertaken at the Hans Christian Anderson Airport in Denmark
Flowcopter
"The power train is an IC engine with a novel, lightweight hydraulic transmission providing power to four hydraulic motors which spin the rotor blades," said Flowcopter's Rob Menzies
Flowcopter
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The Scottish company behind a novel heavy-lift utility UAV that uses an internal combustion engine and hydraulic motors has now frozen design plans and is preparing for production following successful flight tests in Denmark.

As we explained back in 2022, "gasoline engines, with their weird, peaky torque curves, aren't nearly responsive enough to keep a multicopter balanced against rapidly changing winds." Flowcopter's solution to this problem is to use an internal combustion engine to drive a hydraulic transmission system that in turn spins the rotor blades.

"This transmission technology gives the drone a high power to weight ratio allowing higher payloads to be delivered for longer distances," the company's Rob Menzies told us. "It also provides a high level of control to each of the four propellers."

Successful flight tests of the FC100 heavy-lift utility UAV were recently undertaken at the Hans Christian Anderson Airport in Denmark
Flowcopter

The original aim was to build a utility Unmanned Aerial Vehicle (uUAV) capable of flying for six hours on one tank of gasoline while hauling payloads of up to 150 kg (330 lb). Menzies told us that the FC100 that's just undergone successful flight testing at the Hans Christian Andersen Airport in Odense, Denmark, had a maximum take-off weight of 450 kg (992 lb) – including a payload of 100 kg (220 lb) – and a range of 100 km (62 miles).

This uUAV was part of an initial production run of three, with one already having been sold to "a major aerospace OEM." The next phase is already underway and will result in a heavy-lift multirotor capable of hauling a 200-kg (440-lb) payload – and it's this design that will "be the basis of our production run moving forward."

Larger aircraft are in the pipe too – with a variant able to heft more than 350 kg (771 lb) on track for development by the end of this year. In the meantime, Flowcopter is looking to secure flight test authorization for a UK demo by June. The video below has more.

Source: Flowcopter

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5 comments
paul314
At some point can they swap in other engines?
guzmanchinky
This is why a border wall would never work. Just use a drone to lift people over one at a time...
riczero-b
This would be perfect for battlefield medevac .
Spud Murphy
By designing this around an ICE and hydraulic motors, they are stuck using ICE. If they shifted to electric power once batteries become capable of doing what they want (they are pretty close now anyway), you would not use the hydraulic drive and its added inefficiency, so you would have to replace the whole drive system, starting from scratch. This design seems like a dead end, especially when the world is electrifying, as it needs to.
MQ
Constant speed variable-pitch rotor systems allow direct Piston ICE, Turbine or Electric propulaion to be used.. Variable speed Constant pitch Electric wins over hydraulic every day of the week.

Horses for courses, trying topologies that are terrible for efficiency doesn't scale well... (there is a reason bumble bees aren't the size of crows.

For the BEV fans, batteries are still an order of magnitude from replacing liquid fuels fpr long endurance missions, and wingless rotorcraft are terrible at anything requiring speed and loiter operations..