KMB JET28 (Rev. 3) thruster unit

Scope of delivery:

• 1x KMB JET28 (Rev. 3) thrust unit, without steering, without thrust reversal system
• 1x KMB JET2803 screws set

The KMB JET28 thruster unit is the base for every KMB JET28 drive unit.

RC jetboat drive for electric motors - up to 20000 RPM - up to approx.800 W - operational rpm range from  8000 to 20000 RPM - for custom-made RC model boats like Yachts, race  and sport boats as well as civil, research and military model vessels with approx. 50 to 150 cm length and 1,5 to 4 Kg weight ready to run per installed KMB JET28 unit - without steering and/or thrust reversal function.

Material kit: Includes unmounted / unassembled parts. For installing, works like grinding, glueing and drilling are required. Working materials not included

Features of the KMB JET28

• Preassembled and ready to install KMB JET28 (Rev. 3) suction tunnel, including impeller and motor shaft coupling (for motor shafts Ø 5 mm)
• Solid, one-piece suction tunnel casing made from fibreglass reinforced ABS-injection
• Ø 4 mm impeller shaft, impeller side notched, motor side leveled, impeller overmolded
• Motor side ball bearing and axial nylon bearing washer
• Impeller side sinter bronce bearing, axial steel and nylon bearing washer
• Grease-filled, refillable Steven tube
• Integrated motor mount incl. material (M4 threaded bolts and hexagon nuts) for mounting a motor or an adaptor flange)
• Motor connection dimensions for motors or adaptors with 29 mm hole spacing and M4-threads (e.g. brushed 700-motor, MH11 or MH12)
• KMB high load shaft coupling Ø 4 mm (drive shaft) / Ø 5 mm (motor shaft), pre-mounted
• Direct mounting of motors with shaft lengths between 17 and 21 mm from connection surface possible
  - For using adaptor flanges (e.g. MH11 / MH12), the length of the adaptor flange needs to be added to the required motor shaft lengths mentioned above
  - By adding additional axial nylon bearing washers between the coupling and the ball bearing (underpinned Offsetting of the coupling), the required minimum shaft length can be reduced to 14 mm (+ adaptor flange length).
• Including JET28 flange ring, exhaust nozzle, stator and screws set
• JET28 steering and thrust reversal systems can be upgraded

Further information:

• KMB JET28 (Rev. 3) - motor power / impeller rpm - measurement series / approximation - static thrust setup
• General information all around the KMB JET28

Recommended motorisation (brushless, requires adaptor)

• up to 10.000 rpm: Motors supporting a continuous power >= 200 Watt
  Cells (LiPoly) and motor-KV; rough current estimation for full throttle
  
  • 3S: KV <= 900; I ~ 18 A
  • 4S: KV <= 675; I ~ 13,5 A
  • 5S: KV <= 540; I ~ 11 A
• up to 20.000 rpm (allowed maximum for JET28): Motors supporting a continuous power >= 800 Watt
  Cells (LiPoly) ans motor-KV; rough current estimation for full throttle
  
  • 3S: KV <= 1800; I ~ 75 A
  • 4S: KV <= 1350; I ~ 55 A
  • 5S: KV <= 1080; I ~ 44 A

Recommended motorisation (brush motors)

• 700-class-Neodym-motors (up to 1650 rpm/volt) with 3S- to 4S-LiPoly
• 800-class--motors (up to 1250 rpm/volt) with 3S- to 5S-LiPoly