● 17 min readShowdown: Uno R4 vs Uno R3 vs Nano
Welcome to Vol. 12 of The Probots Showdown. Three boards. Three price points. Three very different futures for your project.Should you stick with the
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Professional 51mm 5-blade ducted black propellers for micro cinewhoops. Features a 1.9" pitch, high-strength PC material, and a 1.5mm 3-hole T-mount hub for maximum stability and low noise.
Silence your micro-quad and sharpen your footage. The Gemfan D51 (2020-5) is specifically engineered for ducted cinewhoops where "clean air" and low vibration are paramount. By utilizing five blades instead of the traditional three or four, this propeller significantly reduces the high-pitched "whine" of small drones, shifting the sound to a lower, more pleasant frequency that is less disruptive in indoor filming environments.
Probots™ ProSpec Grade Low-Noise Performance. These propellers are Probots™ ProSpec Grade , manufactured from high-impact Polycarbonate (PC) to withstand the high-torque loads of 4S micro builds. The 1.9-inch pitch is fine-tuned to offer massive low-end "grip," allowing pilots to pull out of dives or execute sharp turns with minimal prop-wash. The 1.5mm T-mount hub ensures a precision mechanical lock to your motor bells, eliminating the risk of prop slippage during high-G maneuvers.
Prop Diameter: 51mm (2.0 Inch)
Pitch: 1.9 Inch
Blades: 5 (Pentapal Design)
Material: Durable Polycarbonate (PC)
Shaft Hole: 1.5mm (3-hole T-mount)
Centre Thickness: 4.6mm
Weight: 0.996g per propeller
Recommended Motors: 1204 and above
2-Inch Ducted Cinewhoops: The gold standard for the BetaFPV Beta85X and custom 2-inch pusher builds.
Indoor FPV Videography: Quieter flight profile ideal for filming in public or residential spaces.
Close-Proximity Filming: Stable thrust for following slow-moving subjects without micro-jitters.
Unlock New Capabilities (Project Evolution)
Feature Upgrade: Moving from 4-blade to 5-blade D51S typically results in a smoother hover and improved low-end torque, making it easier to hold steady lines during cinematic "slow-pans".
Effort Level: Beginner. Compatible with almost any 1.5mm T-mount micro brushless motor on the market.
4 x Black CW (Clockwise) Gemfan D51 5-Blade Propellers
4 x Black CCW (Counter-Clockwise) Gemfan D51 5-Blade Propellers
Why use 5 blades instead of 4? 5 blades provide a smoother throttle feel, better low-end grip, and a lower noise profile.
Will these fit a 1.0mm shaft motor? No, these are designed for 1.5mm shafts only.
Are these compatible with the DJI Neo? They are a popular third-party upgrade for the DJI Neo for pilots seeking less noise.
Do I need to use screws? Yes, these are T-mount propellers; you must use two M2 screws per prop to secure them to the motor bell.
What is the "D51" measurement? It represents the 51mm (2-inch) prop disk diameter.
Are they durable for crashes? Polycarbonate is extremely resilient, but 5-blade props have thinner blades that can bend if they strike hard objects.
Do they come in other colors? Standard options include Clear Gray, Black, Orange, and Yellow.
What is the pitch of these props? They have a 1.9-inch pitch for a balance of torque and efficiency.
Will these fit a 75mm Whoop? No, 75mm whoops typically use 40mm props. These are for 85mm+ or 2-inch frames.
How much does each prop weigh? Approximately 0.996 grams.
Are they better for racing? No, they are optimized for cinematic stability and noise reduction rather than raw top speed.
What motor KV is best? Around 4500KV–5500KV for 4S or 8000KV+ for 2S/3S builds.
Are they quieter than tri-blade props? Yes, the increased blade count significantly dampens the propeller "scream".
Can I use them for "Props-Out" configuration? Yes, the 8-pack includes 4CW and 4CCW to accommodate any rotation.
What is the center hub thickness? 4.6mm.
Are they factory balanced? Yes, Gemfan cinewhoop props are precision-molded for high dynamic balance.
What is the max prop width? 10.6mm.
Will they help with prop-wash? Yes, the 5-blade "grip" is excellent for smoothing out prop-wash in tight turns.
How do I tell CW from CCW? The "logo" side faces up, and the curved leading edge should face the direction of motor rotation.
Can I use these for long-range? No, 2-blade or 3-blade props are more efficient for long-duration cruising.
| Propeller Diameter | 2 inch |
|---|---|
| Propeller Pitch | 1.9 inch |
| Number of Blades | 5 |
| Shaft Hole / Bore Diameter | 1.5mm |
| Material | Polycarbonate (Plastic) |
Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
We delivery electronics components and parts throughout India using standard couriers like Bluedart, Delhivery & India Post.
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Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
We offer specialized services for Bulk, Wholesale & B2B Customers like discounted prices, additional shipping options, customised products, etc . Customer with large quantity & regular orders qualify for the specialised discounted rates.
We also offer dedicated sales team to assist you with the order process by providing sales quotations, PI, technical support for choosing products, etc.
Note: Business Orders are processed manually and usually take 1-3 days to process compared to placing the order directly on our website. Please plan your purchases accordingly.
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Probots Electronics is highly regarded for its great selection of components and professional service. Customers frequently praise the awesome care and timely delivery provided by the team to ensure all products arrive safely.
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