Gemfan Hobby Flash 7040-3
Series: Gemfan Hobby Propellers for drones
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The Gemfan Flash 7040-3 is a three-blade polycarbonate propeller from Gemfan Hobby for long-range FPV quadcopters of the small class. The type code 7040 stands for 7 in diameter and 4 in pitch, and the appended 3 for the number of blades.
The disc diameter is given as 178.43 mm; the inch value is 7. A 4 in pitch is flat for a 7 in diameter: it keeps the current draw per unit of thrust low and favours flight time over top speed, as long-range builds require. Three blades raise thrust and response at this diameter but cost efficiency compared with two-blade solutions. The weight is 7.9 g and the bore 5 mm. The propeller does not fold. Motors with a low KV rating belong with 7 in, since large diameters work most efficiently at low rotational speed.
Long range is associated with the reach of the video link and the battery, but legally visual contact counts: in the open category the aircraft must stay in view of the pilot or an observer, and the maximum altitude is 120 m. Flights beyond visual range belong to the specific category. From 250 g take-off mass operator registration is mandatory.
When buying it is important that the 5 mm bore fits the motor shaft. Polycarbonate is tough and tolerates ground contact but picks up nicks on blade tips and leading edges. Even small damage visibly changes the power consumption of long-range builds, because the drive works continuously in a narrow efficiency range; a set consists of two left- and two right-rotating propellers and is replaced together.
Technical data
Other data
| Blade count | 3correct |
|---|---|
| Diameter (inches) | 7correct |
| Diameter (mm) | 178.43correct |
| Folding | nocorrect |
| Hub bore (mm) | 5correct |
| Material | Polycarbonat (PC)correct |
| Pitch (inches) | 4correct |
| Weight (g) | 7.9correct |
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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