HQProp Ltd 18x9x3 Propeller
Series: HQProp Ltd Propellers for drones
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The HQProp 18x9x3 is a three-blade propeller from HQProp Ltd (China) made of glass-fibre-reinforced nylon for larger multicopters of the mid-sized class. The designation lists diameter, pitch and blade count in turn: 18 in, 9 in, three blades. It is supplied with adapter rings.
The 9 in pitch is half the diameter and therefore rather high for a multicopter: it favours forward speed and loads the motor harder than flat hover propellers do. Three blades raise thrust at 18 in, where space on the frame is limited, and lower efficiency. The weight is 89 g. The hub is bored to 6 mm, measures 24 mm across and is 12 mm thick; the supplied adapter rings of 3, 3.17, 4, 5, 6 and 8 mm fit the mount to the motor shaft. The propeller does not fold.
The legal framework attaches to the aircraft: multicopters of this size fall, depending on take-off mass, into class C2 (under 4 kg) or C3 (under 25 kg), and the open category ends at 25 kg. Classes C1 to C3 require direct remote ID. A C2 aircraft keeps 30 m from uninvolved people, and a C3 aircraft flies 150 m away from residential, commercial, industrial and recreational areas.
Glass-fibre-reinforced nylon is tougher than carbon and breaks more forgivingly on ground contact, but it is less stiff; under high load the blades flex more. Right- and left-rotating propellers belong in pairs on the motors. Check that the adapter rings sit without play, look for cracks in the hub around the bore and for nicks on the blade tips; at 18 in imbalance is felt in the motor bearings and at the flight controller.
Technical data
Other data
| Blade count | 3correct |
|---|---|
| Diameter (inches) | 18correct |
| Folding | nocorrect |
| Hub bore (mm) | 6 mmcorrect |
| Material | Glasfaserverstaerktes Nyloncorrect |
| Pitch (inches) | 9correct |
| Weight (g) | 89correct |
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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