Master Airscrew (Windsor Propeller) 3MR Series 3-Blade 14x7 Propeller
Series: Master Airscrew (Windsor Propeller) Propellers for drones
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The 3MR 14x7 is a three-blade propeller of the 3MR series from Master Airscrew (Windsor Propeller, USA) made of glass-fibre-reinforced composite for mid-sized multicopters; it is listed for cinelifter builds. The designation gives the series, the diameter and the pitch: 14 in, 7 in.
The diameter is 14 in, and 356 is given as the figure in millimetres. The 7 in pitch is half the diameter and rather high for a multicopter: it favours forward speed and loads the motor harder than flat hover propellers. Three blades raise thrust at a limited diameter and lower efficiency. The weight is 54.5 g, the bore 6 mm, and the hub is 13 mm thick. The propeller does not fold. The counter-clockwise version (CCW) is offered; the clockwise version (CW) is a separate product.
A cinelifter carries a heavy camera, and take-off mass including battery and camera decides the classification. From 250 g the operator must register, and classes C1 to C3 require direct remote ID. Aircraft of classes C3 and C4 fly in subcategory A3 at 150 m distance from residential, commercial, industrial and recreational areas, and the open category ends at 25 kg.
Glass-fibre-reinforced composite is tougher than carbon and breaks more forgivingly on ground contact, but it is less stiff. For selection a cinelifter needs both directions of rotation, two propellers each, and motors with a suitable KV rating for 14 in. Check the blade tips for nicks, the hub around the 6 mm bore for cracks and the running for imbalance, which on camera builds shows as vibration in the picture.
Technical data
Other data
| Blade count | 3correct |
|---|---|
| Diameter (inches) | 14correct |
| Diameter (mm) | 356 mmcorrect |
| Folding | nocorrect |
| Hub bore (mm) | 6 mmcorrect |
| Material | Glasfaserverstaerkter Verbundwerkstoffcorrect |
| Pitch (inches) | 7correct |
| Weight (g) | 54.5correct |
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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