The SIYI E3 brings a motor, an FOC electronic speed controller and a folding propeller together as a matched propulsion set, while keeping the major components physically separate. It is worth considering when a drone frame has room for an independently mounted ESC or when access to individual replacement parts matters more than a compact all-in-one motor unit.
The supplied catalog places E3 on a 6S LiPo platform and identifies a 600–700mm aircraft wheelbase. The propeller is a 15.5 × 5.8-inch folding design. These facts define a useful starting point for comparing the available frame space and power arrangement, rather than choosing only by the motor's KV number.
E3 modular propulsion illustration extracted from the supplied SIYI catalog. The motor, ESC and propeller are separate components.
Motor
The motor is specified at 350rpm/V and 120g ±1g, with a 35.1 × 10mm stator. Its dimensions and attachment arrangement need to be checked against the intended motor mount, especially when replacing a different motor family on an existing aircraft.
ESC
The separate FOC controller provides CAN and PWM signal choices, with 5V and 3.3V compatibility listed for the signals. Its tabulated mass is 46.5g ±0.1g. Keep its power leads, connectors and cooling space in the physical layout.
Propeller
The folding propeller uses a carbon-plastic composite and is listed at 26g ±0.5g. Confirm the actual propeller and hardware supplied with the motor/ESC combination, including the requested replacement quantities.
Compare thrust under the stated condition
The catalog gives a maximum single-axis thrust of 2.2kg at 16A and a recommended single-axis thrust range of 0.5–1kg. The current is part of the published maximum-thrust condition. These are propulsion-unit figures; neither number states the payload a complete drone can carry.
A useful offer should identify the matched motor, ESC and propeller revision behind the quoted result. Have the offered ESC revision stated alongside its current rating. The 16A condition accompanying the catalog thrust result is not a substitute for the controller's separate continuous and peak current limits.
Look beyond the nominal wheelbase
The 600–700mm wheelbase identifies the catalog's intended class of frame. Actual propeller clearance, motor-mount pattern and the room available for a separate ESC still determine whether a particular frame is suitable. A folding propeller also needs to be considered as an assembly, with the hub and retaining hardware belonging to the selected motor package.
The listed IPX5 rating does not establish a dust rating or make every connector in an aircraft weather-sealed. Ask for the relevant product revision and intended enclosure conditions when environmental exposure affects the purchase.
Detail cropped from the same catalog illustration, highlighting the motor and separate ESC; this is not another test photograph.
Make competing quotations easy to compare
Request the motor, ESC, propeller and connection accessories as named items. Provide the aircraft frame drawing or mount details, 6S power arrangement, control-interface requirement and desired number of units. If spare propellers or an extra ESC are needed, list them separately so the initial set and service stock are clear.
E3 selection questions
Is E3 a complete drone?
No. It is a propulsion set for integration with a suitable aircraft frame, power system and flight-control system.
Does 2.2kg mean the UAV can carry a 2.2kg payload?
No. It is the catalog's single-axis maximum thrust at 16A. Aircraft weight, system configuration and other factors belong to the complete aircraft assessment.
Why choose this layout instead of an integrated unit?
A separate motor and ESC can make component placement and individual service access more convenient. Compare that benefit with the mounting and cable space needed by the actual frame.