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Boiler Construction
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3500/4000 More changes

No. 3500.
Type:
Horizontal marine centre flue.
Barrel length: 7 in.
Barrel diameter:
3 1/2 in.
Flue diameter:
1 1/4 in.
Chimney diameter: 1 1/2 in.
Weight empty:
2.1 kg
Working pressure:
60 p.s.i.
Availability: 1986-1990
No. 4000.
Type:
Horizontal marine centre flue.
Barrel length:
9 in.
Barrel diameter:
4 in.
Diameter of centre flue:
1 1/4 in.
Chimney diameter: 1 1/4 in.
Working pressure: 60 p.s.i.
Availability: 1986-1990



MARINE BOILERS
The 3500 and 4000 Boilers have been specifically designed to replace the 1035 Boiler. These boilers have many advantages, the most prominent of which is that both boilers are significantly shorter than the old 1035 model.

Type 3500 Centre Flue Boiler

Copper Drum (silver soldered and hydraulically tested)
Features
Features Gunmetal Steam Dome
Safety Valve
Water Gauge
Steam Valve
Mahogany Wood Lagging, Brass Straps
Copper Drum painted matt black
5/32 in. dia. Superheater Tube.

The Type 3500 Boiler was specially designed to suit the 10V and 10H engines, and is ideal
for marine radio control models.

A continuous water feed system can be implemented when using the 10V engine with its directly driven feed pump. The delivery of this pump is fed to a check valve (optional extra) for which a seating and blanking plug is provided on the boiler as standard equipment. The 3 1/2 in. boiler ideally complements the No. 10 engines and makes the perfect combination for a marine application.
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Please note:—The check valve, pressure gauge and syphon are optional extras.

Part No. Availability
34-50-72350—3500 Finished Boiler with Test Certificate.
Postage Code: A Packed Weight: 3.5Kg.

BURNER

To complement the 3500 Boiler we have developed a new burner unit which is neatly located in the centre flue of the boiler, and is fueled by disposable Butane gas cartridges (not supplied by Stuart Turner Ltd). g g

The burner kit comes with all fittings up to the bottle, which is readily available
Part No. Availability
34-50-72488—3500 Gas Burner Kit (cylinder not supplied) for use with Primus Canisters.
Suitable Gas Canisters:
Butane/Propane Mix No. 2204.
Butane No. 2201.

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Type 4000 Centre Flue Boiler

SPECIFICATION:

4 in. dia. X Y9 in. (101mm. dia. x 229mm.)
Centre Flue dia. 1 1/4 in. (38.1mm.)
Dry Weight: 2.8 Kg.
Working Pressure: 60 p.s.i. (4 Bar)
1 1/4 in. dia. Chimney

Copper Drum (silver soldered and hydraulically tested)

Features Gunmetal Steam Dome
Safety Valve
Water Gauge
Steam Valve
Mahogany Wood Lagging, Brass Straps
Copper Drum painted matt black
3/16 in. dia. Superheater Tube

The Type 4000 Boiler has been designed with the D10 and Score engines in mind and would be ideal for a remote control installation.

A continuous water feed system can be implemented when using the D10 engine with its directly driven feed pump. The delivery of this pump is fed to a check valve (optional extra) for which a seating and blanking plug is provided on the boiler as standard equipment.

Because of its size and steam output this boiler could well service some of our other engines such as the Beam and Victoria range.

Please note:—The check valve, pressure gauge and syphon are optional extras.

Part No. Availability
34-50-72351—4000 Finished Boiler with Test Certificate.

Postage Code: B | Packed Weight: 4Kg.

BURNER

As with the 3500 Boiler we have developed a burner specifically for use with the 4000

Boiler. This burner also features neat location in the centre flue and is ignited safely while in this position.

Part No. Availability
34-50-72489—4000 Gas Burner Kit (cylinder not supplied) for use with Primus Butane/Propane Mix No. 2204 or Butane No. 2201.

The gas canisters are not available from Stuart Turner Ltd.



Design

These two boilers are larger than their predecessors and incorporate some more design changes that simplify construction. The Steam dome has been moved to the centre of the boiler. The flue is flush with the end of the boiler and a casting fits allowing the chimney to be attached. A superheater consisting of a coiled copper pipe that was mounted in the chimney and flue adapter is connected to the side of the dome via a valve and then connects to the engine. The water gauge now fits entirely onto the cylinder end and a new fitting has been added for a clack valve to be fited, allowing water to be added under pressure by one of the stuart hand pumps or even the ST boiler feed pump. A new mounting system has been included consisting of bent brass brackets held to the boiler by brass straps that also hold the wooden lagging. On my example the wood lagging is also glued to the boiler.







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4000 boiler with superheater connected to dome valve and running through the funnel.



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3000 clearly showing the new casting that fits to the flue and allows the funnel to be fixed.



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Well designed power plant. with servo controlled steam valve.



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Stacks Image 174
Boiler kit as supplied.






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