RC Boat Jet Pump Thruster 28mm Water Jet Propulsion Kit with Reversible Thrust for 3.18mm 4.0mm 5.0mm Motor Shaft DIY Assembly Set(Jet Pump,3.18)

28mm RC Jet Pump Thruster Kit for RC Boats – Compatible with 3.18mm, 4.0mm, and 5.0mm Motor Shafts – Optional Brushless Motor ComboThe kit features a stainless steel 4mm drive shaft, mounted with dual high-speed ball bearings for smooth, reliable operation. The jet body is molded from durable plastic, equipped with an automatic water intake to cool both the motor and ESC during high-load operation. A PC 26mm three-blade impeller, mounted with a fork and self-locking nut, ensures high-speed reliability and easy maintenance.For easy customization, the set includes an aluminum motor mount (19mm/25mm bolt spacing) and a 4x3.18mm aluminum coupler, making it compatible with popular motors. Choose between pump-only or pump + motor configurations.Note: This is a DIY assembly kit designed for experienced RC hobbyists. Ships as unassembled parts; requires assembly.Specifications:Pump Diameter: 28mmDrive Shaft: 4mm stainless steelBearings: Dual high-speed ball bearingsShaft Sleeve Outer Diameter: 9mmImpeller: 26mm 3-blade PC propeller with fork + self-locking nutPump Body Material: PlasticMotor Mount: Aluminum (bolt spacing 19mm/25mm)Coupler: Aluminum 4mm to 3.18mmWater Cooling: Integrated inlet for motor/ESC coolingCompatible Motors: 550 brushed, 3650 brushlessBoat Length Compatibility: 400–600mmFunctionality: Supports reverse thrust, includes anti-weed bottom guardPackage Options: Jet pump only / Jet pump + 3650 brushless motor

• High-thrust 28mm water jet pump with reverse function
• Stainless steel shaft with dual ball bearings for smooth performance
• Integrated water intake system for efficient motor/ESC cooling
• Compatible with 3.18mm, 4.0mm, and 5.0mm shaft motors
• DIY kit tailored for RC hobbyists – perfect for 400–600mm boats