Product overview
The Gemfan F4019 is a folding three-blade propeller for compact 4-inch FPV aircraft. Its architecture combines three folding blades with a polycarbonate construction, targeting a balance of thrust, control, and efficiency. Intended applications include freestyle flying, technical maneuvering, endurance-focused builds, training, and general aerial use. The folding layout is designed to reduce resistance during forward motion and improve airflow stability, while the three-blade arrangement supports consistent thrust during tight or dynamic maneuvers.
Each propeller measures 4 × 1.9 inch, has a 1.9-inch pitch, and weighs 2.11 g. Integration uses a 1.5 mm, three-hole mounting interface, with compatibility specified for 1505–1806 class motors. These dimensions and motor classes define its stated integration scope. Each pack contains two clockwise and two counterclockwise propellers. Clear, Transparent Blue, Transparent Grey, Transparent Red, and Fluorescent Yellow options provide color choices for identification and appearance. The supplied product is a propeller pack.
Specifications
| Specification | Value & conditions |
|---|---|
| Manufacturer and model | Gemfan F4019 |
| Product type | Folding three-blade propeller |
| Blade count | 3 (folding) |
| Size | 4 × 1.9 inch |
| Pitch | 1.9 inch |
| Weight | 2.11 gPer propeller. |
| Material | PC (polycarbonate) |
| Mounting interface | 1.5 mm, 3-hole design |
| Compatible motor class | 1505–1806 class motors |
| Color options | Clear / Transparent Blue / Transparent Grey / Transparent Red / Fluorescent Yellow |
| Supplied configuration | 2 clockwise and 2 counterclockwise propellersPer pack. |
| Intended platforms and applications | 4-inch FPV and lightweight drone platforms; endurance and efficiency-focused builds; smooth cruising and controlled flight; training and general-purpose aerial platforms |
| Folding design purpose | Designed to reduce aerodynamic drag and improve flight efficiencyDuring forward flight on lightweight setups. |
| Power delivery | Designed for stable, linear thrust output and controlled flightWith a 1.9-inch pitch. |
| Intended applications | 4-inch FPV platforms; freestyle and technical maneuvering; endurance and efficiency-focused builds; training, practice, and general-purpose aerial use |
| Folding architecture purpose | Designed to reduce drag and improve airflow stability |
| Thrust and control characteristics | Designed for consistent thrust, control, and maneuverability in tight or dynamic flight scenarios |
| Aerodynamic function | Folding blades are designed to decrease resistance and improve efficiency across varying speedsDuring forward motion. |
| Material resistance | Impact- and wear-resistant polycarbonate |
