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These are Gemfan 2023 3-blade propellers sold by BetaFPV for 1.5 mm shaft whoop drones. The page describes a design that minimises vibration for smooth and precise flight.
The set is grey polycarbonate with a 51 mm prop disk diameter and a 1.5 mm shaft hole. The set weighs 3.54 g. The page showed low stock (3 left).
3-blade design: to minimise vibrations.
1.5 mm shaft hole: for 1.5 mm shaft models.
PC material: for impact resistance.
51 mm prop disk: as listed.
3.54 g per set: light on the motor.
Pack of 4: grey props.
A drone propeller converts motor torque into thrust. Each blade is an aerofoil: as the motor spins the prop, the blades push air downward and the reaction force lifts the aircraft. Diameter and pitch set how the prop behaves. A larger diameter moves more air and suits efficient, lower-RPM flight, while a higher pitch moves the aircraft forward faster per revolution but demands more current from the motor.
Multirotors use pairs of props that spin in opposite directions. Clockwise (CW) and counter-clockwise (CCW) props cancel out the torque reaction so the aircraft does not spin, and the flight controller changes individual motor speeds to steer. Always fit each prop on the motor that turns the matching direction, and check your flight controller motor-direction settings before the first flight.
Fit and balance matter. The hub hole or shaft size must match your motor shaft, and the prop should sit flat and tight with the retaining nut fully secured. Check every blade for chips, cracks and bends before each flight, because a damaged prop causes vibration that shows up as jello in the video and extra heat in the motor. Replace props after a hard crash instead of flying on a damaged set.
Keep a few spare sets in your kit. Props are the part most likely to break in a crash, and swapping a damaged one takes only a minute. When you replace a prop, replace it with the same size, pitch and blade count as the rest of the set so that all motors produce matching thrust.
Whoop drones
Racing and freestyle micro quads
1.5 mm shaft motors
Spare props for crashes
Indoor FPV flying
The page says the props suit 1.5 mm shaft models including racing and freestyle drones. Check that your motors have a 1.5 mm shaft before you buy.
The pack has four props, so you will need to sort the CW and CCW props by direction when you fit them.
Item: Gemfan 2023 3-blade Propellers (1.5mm Shaft 4PCS)
Color: Grey
Weight: 3.54 g per set
Blades: 3
Material: PC
Prop disk diameter: 51 mm
Shaft hole: 1.5 mm
1 x Gemfan 2023 3-blade propellers (set of 4)
Pilots of whoop-class drones who need 1.5 mm shaft spares.
Four.
1.5 mm.
51 mm.
PC (polycarbonate).
| Brand | BetaFPV |
|---|---|
| Blade Count | 3.000000 |
| Material | PC |
| Shaft Size | 1.500000 mm |
| Weight | 3.540000 g |
| Selling unit | PCS |
