Propeller size chart
Diameter, pitch, blade count, motor size and cell count are one decision, not five.
Researched from published specifications and verified owner reviews · updated 2026
The short answer
Propeller numbers give diameter, pitch and blade count, so 5x4.3x3 is a five inch tri-blade with 4.3 inches of pitch. The settled default for a 5 inch freestyle quad is a 2207 motor around 1800KV on 6S with a 5 inch tri-blade. Motor speed is roughly KV multiplied by voltage, so higher cell counts need lower KV motors, and fitting high KV to high voltage with an aggressive propeller is the classic way to destroy electronic speed controllers.
On a camera drone the propeller is a consumable you replace when it gets nicked. On a build it is a design decision that has to agree with the motor, the cell count and the electronic speed controllers, and getting it wrong produces overheating rather than a gentle degradation in performance. This chart covers both cases.
Gemfan
Gemfan 51466 V2 three-blade props (20 pack)
5 inch, 1.4 pitch, tri-blade, 20 pieces
The standard tri-blade for a 5 inch freestyle quad, sold in packs of twenty because that is roughly a season of careful flying or a month of flying near trees. Buying the settled default matters more than it sounds: every tune, every pack recommendation and every parts list you will read assumes this size and pitch.
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Reading a propeller number
| Marking | Means | Effect of increasing it |
|---|---|---|
| First number, e.g. 5 | Diameter in inches | More thrust and more efficiency, slower response, more current at speed |
| Second number, e.g. 4.3 | Pitch in inches per revolution | Higher top speed, sharply higher current draw and heat |
| Third number, e.g. 3 | Blade count | More grip and smoothness, less efficiency, more noise |
| Sometimes a letter | Rotation direction or family | Fit matching rotations or the aircraft will not fly |
Some manufacturers compress this into a four or five digit code. A 51466 propeller is 5.1 inch diameter with 4.66 pitch, which reads oddly until you know the convention. When in doubt, the product listing states the plain figures.
Matching propeller, motor and cell count
| Build class | Propeller | Motor | Typical KV on 4S | Typical KV on 6S |
|---|---|---|---|---|
| Whoop, ducted indoor | 31 to 40 mm | 0802 to 1103 | Around 19000 on 1S | Not applicable |
| Toothpick, 2.5 inch | 2.5 inch tri | 1103 to 1404 | 4500 to 5000 | 3000 to 3500 |
| 3 inch | 3 inch tri | 1404 to 1507 | 3000 to 4000 | 2500 to 3000 |
| 4 inch | 4 inch tri | 1606 to 1804 | 2500 to 3000 | 1800 to 2200 |
| 5 inch freestyle | 5 inch tri, 4.3 to 5.1 pitch | 2206 to 2306 | 2400 to 2700 | 1700 to 1900 |
| 5 inch racing | 5 inch bi or tri, higher pitch | 2207 | 2500 to 2800 | 1800 to 2000 |
| 7 inch long range | 7 inch bi | 2806 to 2807 | Not typical | 1300 to 1500 |
| Cinewhoop, ducted | 3 inch, 5 blade | 1408 to 1507 | 3000 to 4000 | 2500 to 3000 |
These are ranges rather than prescriptions and they exist because motor speed is roughly KV multiplied by voltage. That single relationship explains the whole table: doubling the cell count from 3S to 6S means roughly halving the KV to keep propeller speed in the same place. A iFlight XING-E Pro 2207 1800KV motors (4 pack) ($71) at 1800KV on 6S sits exactly in the freestyle row for that reason.
Confirm any specific combination on the propeller and motor matching calculator, and check the resulting thrust figure on the thrust to weight calculator, because a combination that agrees electrically can still fly badly.
Blade count, honestly
Two blades. The most efficient option and the least smooth. Longer flight times, higher top speed, more prop wash and a twitchier feel. The right answer for racing and for long range builds where every minute counts.
Three blades. The freestyle default. Slightly less efficient and noticeably better grip in the air, particularly through hard direction changes where a two-blade propeller lets go. Almost every 5 inch build guide assumes tri-blade.
Four and five blades. More thrust for a given diameter and a real efficiency cost. Useful when diameter is constrained by ducts, which is exactly the cinewhoop case, and the reason ducted builds run five blade propellers on small diameters.
Camera drone propellers. A different world. These are matched to the airframe by the manufacturer and the only real choice is standard or low-noise. Low-noise designs cut the tonal whine that carries furthest at a small efficiency cost, which is usually worth it for anything flown near people or property.
Replacement and maintenance
Replace as a set, never individually. A single new blade among three worn ones changes the balance the flight controller is trimming against, and the aircraft compensates by fighting itself. A pack of low-noise spares such as Low-noise propellers for Mini 3 and Mini 4 Pro (24 pack) ($14) costs less than one gimbal service.
Inspect before every flight. Run a fingernail along each leading edge. A nick you can feel is a nick that will show as vibration in the footage, and it is the most common cause of the wavy artefact people call jello. The diagnostic sequence is on fixing jello and vibration.
Treat FPV propellers as consumables. Twenty propellers is a season if you fly carefully and a month if you fly close to trees. Anyone counting propeller cost on a freestyle quad is counting the wrong thing; the expensive parts are the motors and the stack.
Check tightness, not just condition. On a build, propeller nuts back off. On a folding camera drone, the arms and the propeller mounts both wear. The intervals are on the maintenance schedule.
Weight, guards and the threshold
Propeller guards are the accessory most likely to push a sub-250 g aircraft over the registration line, typically adding 25 to 35 g on a Mini-class airframe. A Propeller guard for Mini 4K, Mini 2 and Mini SE ($15) is worth fitting for the first ten flights and for anything indoors, and worth removing outdoors if the registration exemption matters to you. See the weight and registration calculator and the weight classes chart.
Guards also cost flight time, because they add both mass and aerodynamic disruption near the blade tips where most of the thrust is produced. That cost is real and it is worth paying while you are learning, which is why the recreational starter build includes them and the prosumer build does not.
Two failure modes worth avoiding
Over-propping. Fitting a larger diameter or higher pitch than the motor and speed controllers are rated for. The symptom is heat: motors too hot to hold after a flight, and speed controllers that fail without warning. If a build gets noticeably hot, the propeller is the first thing to reduce.
Mismatched rotation. Multirotors need propellers turning in specific directions in specific positions, and fitting one backwards produces an aircraft that flips on takeoff. Check the markings against the motor direction before every first flight after a rebuild. The build sequence that catches this is on the FPV first build walkthrough.
Figures here are researched from published manufacturer specifications and widely documented build conventions rather than from bench testing. Always check the specific ratings of your own motors and speed controllers before changing propeller size.
Questions people ask
+ What do the numbers on a propeller mean?
The first number is diameter in inches and the second is pitch, the theoretical distance the propeller would advance in one revolution. A 5x4.3x3 propeller is five inches across with 4.3 inches of pitch and three blades. Larger diameter moves more air for more thrust and less responsiveness, and higher pitch increases top speed at the cost of current draw and heat.
+ What propeller and motor should a 5 inch freestyle build use?
A 2207 motor around 1800KV on 6S with a 5 inch tri-blade propeller of roughly 4.3 to 5.1 pitch is the settled default, which matters because it means every tuning guide, pack recommendation and part list you read assumes it. Deviating is possible and puts you outside the well-trodden path where advice is reliable.
+ Why does cell count change the motor I need?
Because motor speed is roughly KV multiplied by voltage. A 2400KV motor on 4S spins similarly to an 1800KV motor on 6S, so moving to higher cell counts requires lower KV motors to keep propeller speed sane. Fitting a high KV motor to a high cell count with an aggressive propeller is how new builders cook electronic speed controllers on the first flight.
+ Two blades, three blades or more?
Two-blade propellers are the most efficient and the least smooth, and they suit racing and long-range efficiency. Three blades are the freestyle default because they trade a little efficiency for noticeably better grip and smoothness. Four, five and six blade propellers add thrust and noise and lose efficiency, and they are mostly used on cinewhoops and ducted builds.
+ How often should propellers be replaced?
On camera drones, whenever a blade shows a nick, a scuff on the leading edge or any visible deformation, and always as a complete set rather than individually. On FPV quads they are consumables measured in packs rather than months. A nicked blade is the most common cause of the vibration that ruins footage and it is the cheapest part on the aircraft.
+ Do low-noise propellers actually work?
They reduce the tonal whine that carries furthest, which is what makes a drone audible and annoying at distance, and they typically cost a small amount of efficiency. On camera drones the trade is usually worth it, especially for anything filmed near people or property. They are not silent and no propeller is.
