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The Code of Numbers on Drone Propellers: How to Read Propeller Measurements?
General Rule: Two Main Variables
The numbers printed on a propeller usually consist of two main values written side by side. This format may appear as 90x45 or sometimes as 9045.
1. First Part: Diameter
The first numbers in the sequence represent the propeller’s tip-to-tip length. The unit is almost always in inches.
Large Diameter: Pushes more air, lifts more weight, but puts more strain on the motor.
Small Diameter: Spins faster (high RPM) and provides more agile maneuvering.
2. Second Part: Pitch
The last numbers represent the propeller’s pitch.
Simple Definition: The theoretical distance the propeller would travel forward in one full rotation (360°) through the air.
Low Pitch: Like a low gear. High torque, easier control, but limited top speed.
High Pitch: Like a high gear. Provides more speed and aggressive performance, but increases battery consumption.
Example Breakdown: What Does 9045 Mean?
Now let’s apply what we’ve learned to a popular size: 9045. We split this number into two parts: 90 and 45.
| Code | Meaning | Value |
| 90 | Diameter | 9.0 Inches |
| 45 | Pitch | 4.5 Inches |
Technical Characteristics of 9045:
Frame Compatibility: This propeller is generally ideal for mid-sized drones in the 450mm class (such as the F450).
Lift Capacity: With its 9-inch diameter, it has enough surface area to lift heavier camera equipment or larger batteries.
Flight Feel: A 4.5-inch pitch is considered a “sweet spot” for drones in this class. It feels neither as aggressive as a racing drone nor as sluggish as a heavy-lift drone. It is one of the most preferred ratios for stable video recording.
Small Tip: If your propeller says 9045R or 9045C (Clockwise), the letter "R" indicates that the propeller should rotate clockwise. Drones always use two clockwise and two counterclockwise propellers!
In Summary
When choosing a propeller, remember the logic: "Bigger first number = More power, second number = More speed". However, always make sure your motor has the capacity (KV rating) to handle that power.
The Code of Numbers on Drone Propellers: How to Read Propeller Measurements?
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