Product Sections

Main Pages

Free Mainland UK Delivery on orders over 150 Pounds
Secure Online Payment, we accept all major credit cards

New Products

Cajun Commander RTR Brushless Airboat

Cajun Commander RTR Brushless Airboat

216.95

Blast down the bayou. The Cajun Commander arrives decked out with ...
find out more

Carson Reflex Pro 3 2-Channel 2.4Ghz Stick Transmitter with Receiver and Servo

Carson Reflex Pro 3 2-Channel 2.4Ghz Stick Transmitter with Receiver and Servo

39.95

An ideal radio for the classic two stick control on Tamiya ...
find out more

Rigging Tool Set

Rigging Tool Set

23.50

This package has been created to compliment our static display wooden ...
find out more

P402 Lifeboat 130mm

P402 Lifeboat 130mm

6.55

Lifeboat SS France Style length 130mm. requires assembly
find out more

Planking Tool Set

Planking Tool Set

26.95

This package has been created to compliment our static display wooden ...
find out more

Radio Control 2.4ghz Package Set inc Servo, Batteries, Charger & ESC

Radio Control 2.4ghz Package Set inc Servo, Batteries, Charger & ESC

79.99

This pack provides the radio control unit and all items necessary ...
find out more

Radio Control 2.4ghz Package Set inc Servo, Batteries & Charger

Radio Control 2.4ghz Package Set inc Servo, Batteries & Charger

58.99

This pack provides the radio control unit and all items necessary ...
find out more

P095A Ships Boat 130mm

P095A Ships Boat 130mm

6.40

Ships Boat Length 130mm
find out more

Best Sellers

Universal Joint - Black

Universal Joint - Black

2.40

Modular type universal joint, requires inserts to complete.
find out more

Threaded Coupling Insert M4

Threaded Coupling Insert M4

2.08

M4 Threaded Insert Old Part No. C8011
find out more

Fine Line 6in Propshaft M4 Thread - Stainless Steel

Fine Line 6in Propshaft M4 Thread - Stainless Steel

7.27

Stainless Steel 6 Inch Long Tube 4mm Fine Line Threaded Propshaft ...
find out more

Plain Coupling Insert 4mm

Plain Coupling Insert 4mm

2.08

4mm Plain Insert, Includes grub screw Old Part No. C8007
find out more

Mtroniks TIO Marine 30 Electronic Speed Controller

Mtroniks TIO Marine 30 Electronic Speed Controller

38.99

The tio Marine30 is a new Brushed Speed Control designed specifically ...
find out more

Plain Coupling Insert 3mm

Plain Coupling Insert 3mm

2.08

3mm Plain Insert, Includes grub screw Old Part No. C8006
find out more

Universal Joint - Red

Universal Joint - Red

2.40

Modular type universal joint, requires inserts to complete. Old Part No. ...
find out more

Brass Rod 1.0mm 1 mtr

Brass Rod 1.0mm 1 mtr

0.72

Brass Rod 1.0mm Diameter x 1000mm
find out more

Jet Drives

Cornwall Model Boats | Hardware & Accessories | Drive Units & Outboards |  Jet Drives

Water Jet Drives

The Jet propulsion unit, also known as a water-jet unit, is primarily fitted to exclusive high-speed motor yachts, ferries, racing boots and similar full-size vessels. In principle this power system consists of a pump which sucks in water though an opening in the bottom of the hull, accelerates it by means of an impeller, then forces it out again through an opening in the stern. Newton’s law of motion now applies: the jet of water expelled at the rear generates an equal and opposite reaction in the boat’s hull.

Boats with Jet propulsion units can operate in very shallow waters, as all the parts usually mounted below the hull, such as propeller, shaft, shaft bracket and rudder, are eliminated. Initial acceleration with a jet unit is very high, and this can be a distinct advantage in certain types of boat such as dragsters. The heeling moment produced by conventional boat propellers is completely absent. Since the water in a Jet propulsion system has to cover long distances in narrow ducts, there are inevitable friction losses which require rather more energy than for an orthodox power system.

CEM Jet Propulsion Unit 78

CEM Jet Propulsion Unit 78

The new CEM JET propulsion unit is ideal for internal combustion engines and powerful brushless motors, as thrust reversal is obtained by operating the reversing flap rather than by reversing the direction of rotation of the engine. The steering nozzle incorporates an integral cooling water nipple. Suitable power plants are internal combustion engines of 15 to 30 cc capacity, and electric motors rated at a minimum of 700 Watts output power.

Length approx. 285mm.Width approx. 78mm,
Height approx. 85mm, Impeller 49mm
Part No: CEM2000

Price: 145.92 (Including VAT at 20%)
Euros: 189.70 (Inc VAT) / US Dollars: US$170.24 (Tax Free)


Quantity:  


Customers who bought this item also bought:
1. 49mm Impeller for CEM Jet Drive (Ref: CEM2001)

Related products:
1. 49mm Impeller for CEM Jet Drive (Ref: CEM2001)
Graupner Jet Propulsion Unit 5 (2347)

Graupner Jet Propulsion Unit 5 (2347)

The new JET propulsion unit is ideal for internal combustion engines, as thrust reversal is obtained by operating the reversing flap rather than by reversing the direction of rotation of the engine. The steering nozzle incorporates an integral cooling water nipple. Suitable power plants are internal combustion engines of 15 to 30 cc capacity, and electric motors rated at a minimum of 700 Watts output power.

Length approx. 285mm.Width approx. 78mm,
Height approx. 85mm, Impeller 49mm
Part No: G2347
More Information...

Price: 149.99 (Including VAT at 20%)
Euros: 194.98 (Inc VAT) / US Dollars: US$174.99 (Tax Free)


Quantity:  


This item is temporarily unavailable. Please Click here for an expected delivery date.

Customers who bought this item also bought:
1. Water Outlet (Ref: MA3059)
2. Water Scoop (Ref: MA3058)
3. Silicone Tubing 4mm ID 1 Metre (Ref: P5508515)

Related products:
1. 2221 Graupner Flexible 3 Pin Coupling Double M6-7mm (Ref: G2221)
2. 2221.1 Graupner Flexible 3 Pin Coupling Single 5-7mm (Ref: G2221.1)
Graupner Motor Mount for JET Propulsion Unit 6 Booster (2395.1)

Graupner Motor Mount for JET Propulsion Unit 6 Booster (2395.1)

Special motor mount for JET Propulsion Unit 6 Booster with connecting hole for Speed 700 series and Ultra 1300-9M motors.
Part No: G2395.1
More Information…

Price: 2.99 (Including VAT at 20%)
Euros: 3.88 (Inc VAT) / US Dollars: US$3.49 (Tax Free)


Quantity:  

Graupner Steering Nozzle With Reversing Bucket (2346.1)

Graupner Steering Nozzle With Reversing Bucket (2346.1)

The kit contains: steering nozzle, reversing flap and frame, mount, lugs and other parts (all parts injection-moulded plastic).
Part No: G2346.1
More Information...

Price: 27.54 (Including VAT at 20%)
Euros: 35.80 (Inc VAT) / US Dollars: US$32.13 (Tax Free)


Quantity:  


Customers who bought this item also bought:
1. 2347.5 Sealing Ring for Jet Unit 5 (Ref: G2347.5)
2. Graupner Jet Propulsion Unit 5 (2347) (Ref: G2347)

Replacement Impellers

Replacement impellers for the Graupner Jet Drive Units

49mm Impeller for CEM Jet Drive

49mm Impeller for CEM Jet Drive

49mm Impeller for the following Jet drive unit: CEM Unit 78
Part No: CEM2001

Price: 9.00 (Including VAT at 20%)
Euros: 11.70 (Inc VAT) / US Dollars: US$10.50 (Tax Free)


Quantity:  


Customers who bought this item also bought:
1. CEM Jet Propulsion Unit 78 (Ref: CEM2000)
49mm Impeller for Graupner Jet Drive

49mm Impeller for Graupner Jet Drive

49mm Impeller for the following Jet drive unit: 2347 & 2348
Part No: G2347.1

Price: 9.98 (Including VAT at 20%)
Euros: 12.98 (Inc VAT) / US Dollars: US$11.65 (Tax Free)


Quantity:  


Customers who bought this item also bought:
1. 2347.7 Nozzle Guide Vane for Jet Unit 5 (Ref: G2347.7)
2. 2347.5 Sealing Ring for Jet Unit 5 (Ref: G2347.5)

Replacement Parts for Graupner Jet Drives

Replacement parts for the Graupner Jet Drive Units

2347.5 Sealing Ring for Jet Unit 5

2347.5 Sealing Ring for Jet Unit 5

Rubber shaft sealing ring for Jet Propulsion unit 5 (2347)
Part No: G2347.5

Price: 17.99 (Including VAT at 20%)
Euros: 23.38 (Inc VAT) / US Dollars: US$20.99 (Tax Free)


Quantity:  


Customers who bought this item also bought:
1. 49mm Impeller for Graupner Jet Drive (Ref: G2347.1)
2. Graupner Steering Nozzle With Reversing Bucket (2346.1) (Ref: G2346.1)
2347.7 Nozzle Guide Vane for Jet Unit 5

2347.7 Nozzle Guide Vane for Jet Unit 5

Nozzle guide vane for Jet Propulsion unit 5 (2347)
Part No: G2347.7

Price: 14.99 (Including VAT at 20%)
Euros: 19.48 (Inc VAT) / US Dollars: US$17.49 (Tax Free)


Quantity:  


This item is temporarily unavailable. Please Click here for an expected delivery date.

Customers who bought this item also bought:
1. 49mm Impeller for Graupner Jet Drive (Ref: G2347.1)

Cornwall Model Boats | Hardware & Accessories | Drive Units & Outboards |  Jet Drives