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VTOL vs fixed-wing vs multicopter: which drone fits your mission?

How multicopters, fixed-wing UAVs and hybrid VTOLs differ in take-off, endurance, range and hovering, and how to match each to a mission.

Star INXS engineering team6 min read

Most military and police drones fall into three families. Each trades take-off convenience against endurance and range in a different way. Pick the family first, then the model.

The three families at a glance

MulticopterHybrid VTOLFixed-wing
Take-off and landingVertical, anywhereVertical, small padRunway, launcher or hand launch
Hover over a pointYesYes, in rotor modeNo: it circles
EnduranceShortestLongLongest
RangeShortLongLong
Set-up timeFastestFastSlower
Best forClose-range ISR, inspection, quick checksLong patrols from tight sitesWide-area and route surveillance
Star INXS examplesMQ-750 MKIII: 60 min, 10 kmADS-35: 4 h, 150 kmIKC-3.5: 5 h, 150 km

Multicopters: fast to launch, easy to hover

A multicopter lifts on its rotors all the time. That makes it simple to fly and able to hold still over a target, but it spends energy just staying up, so endurance is measured in minutes. Choose one for perimeter checks, short-range ISR, inspection and quick-reaction tasks.

Our MQ family runs from the MQ-650 MKI (40 min, rated above 5,000 m) to the MQ-750 MKIII (60 min, 10 km). The MQ-JR adds a jammer-resistant, AES-256 encrypted link.

Fixed-wing: the most efficient way to cover ground

A wing makes lift for free once the aircraft is moving, so a fixed-wing UAV flies for hours on the same energy. The trade-off is launch and recovery: it needs a runway, a launcher or a clear landing area, and it cannot hover.

The IKC-3.5 has a 3.5 m wingspan, flies for up to 5 hours and covers 150 km with up to 5 kg of payload.

Hybrid VTOL: the best of both

A hybrid VTOL takes off and lands on lift rotors, then transitions to wing-borne flight. You get vertical take-off from a small site and fixed-wing endurance in cruise. It is the usual choice for long patrols from mountain posts, ships, forest clearings and other tight sites.

Our VTOLs: the Hybrid VTOL for very high-altitude EO/IR work (launch at 4,500–5,000 m, 7,000 m ceiling), the CONV V5 (2.5 h, above 5,000 m) and the ADS-35 (4 h, 150 km, up to 5 kg).

How to choose

  1. Start with the mission: how far away is the area, and how long must you watch it?
  2. Check the launch site: open ground, a pad, a ship deck or a mountain post?
  3. Decide whether you must hover over one point.
  4. Size the payload: camera, thermal, laser range finder or cargo.
  5. Then compare models on endurance, range and altitude at that payload.

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