Tyto Robotics explains that adding or removing material from drone propellers can improve balance, flight stability, and hardware longevity—with various methods available depending on the propeller’s size, material, and the extent of the correction required.
This overview details how to add weight using substances like glue or tape, and how to remove it through sanding or trimming. It also outlines key precautions for maintaining propeller integrity and ensuring operator safety throughout the process.
Techniques for Adding Material
Paint, Glue, Epoxy & Nail Polish
Lightweight materials such as clear paint, glue, epoxy, and nail polish are suitable for minor adjustments. These materials adhere well and are unlikely to detach during operation. They can be applied to various points on the blade, offering control over correction placement—especially toward the tip for finer balance. However, it can be difficult to measure how much mass is added, and the material must dry before the next test. An accelerator spray can reduce drying time when using glue.
Tape
Tape is a quick solution that allows for immediate application and precise weight measurement. It can be positioned anywhere along the blade. However, weak adhesive tapes may detach mid-test, compromising safety and data quality.
Screws and washers
Small screws and washers are another effective option.
Washers can be added to screws at the hub to increase mass near the center. Alternatively, hub screws can be replaced with heavier or lighter versions. After making these changes, it is critical to confirm that all components are securely fastened to avoid any loose parts becoming projectiles during operation.
Adding Weight to a Propeller Blade with Tape
Techniques for Removing Material
Sanding
For plastic propellers, sanding is a practical method. Tyto Robotics recommends sanding the underside of the blade to minimize aerodynamic disruption. Coarse sandpaper (100–220 grit) is typically used first to remove most of the material, followed by finer sandpaper (400–800 grit) for a smooth finish.
Trimming
When a larger mass reduction is needed, trimming may be preferable. Material should be cut from the trailing edge or tips of the blade to preserve aerodynamic properties. Trimming at the tips will affect both the diameter and pitch of the propeller, so this approach must be applied with care.
Key Considerations
Removing material has the advantage of not adding extra components to the system. However, it may reduce the structural strength and performance capacity of the propeller, including maximum RPM and aerodynamic efficiency.
Material should always be removed from the proper areas—underside for sanding, trailing edge and tips for trimming—to protect the airfoil profile.
Tyto Robotics emphasizes that safety is essential during propeller balancing. The workspace should be cleared of debris, personal protective equipment like gloves and safety glasses should be worn, and a safe distance from rotating propellers must be maintained.
