The Steamboat Association
of Great Britain

to foster and encourage steam boating and the building, development, preservation and restoration of steam boats and steam machinery

to stimulate public interest
in steam boats
and steam boating

to promote high standards
of workmanship,
safety and seamanship

  • Home
  • Steam Outboard Motor Competition

Steam Outboard Motor Competition

  • 06 Jun 2014
  • 08 Jun 2014
  • Beale Park


  • This is ONLY for entering a steam outboard motor in the competition do NOT use this if you wish to visit the Beale Park Boat Show to observe the competition.

Registration is closed

Outboard Motor Competition 2014


One of the objects of the Steamboat Association is “to stimulate public interest in steam boats and steam boating”.  With this in mind we are going to run a light-hearted competition based around the building of steam powered outboard motors.  Entry is free to any SBA members, who can take part either individually or in small teams. If you are interested in taking part in the competition but are not an SBA member why not join the Steam Boat Association?


Form of the Competition

The SBA will provide a boat to which the competitors attach a steam outboard motor.  The boat will include a boiler (with a fireman) to provide steam for the engine.  The entrant will then race against other entries in a time trial.

Definition of a Steam Outboard

For the purposes of this competition any device which will mount on the transom bracket of the host boat and receives steam from the host boat fits the definition of an outboard motor.  

A steam control valve is required on the engine for the entrant to control the engine.

There is no requirement for the use of a traditional outboard motor leg or even to use a propeller. Similarly the engine does not have to be of the conventional steam engine arrangement.  Be as creative as you like!

The outboard motor does not have to include a steering system as this will be provided on the host boat (although it may if you wish).

The Host Boat

The host boat will be Mark Rudall’s Chimera II.  She is approximately 18’ long by 6’ beam.  Her water tube boiler produces about 100 lbs/hr of saturated steam at 100psi.  She is normally driven by a twin cylinder high pressure engine of 2.5” bore by 2.5” stroke. 

Chimera II will be fitted with a temporary mounting bracket that extends across the whole of the transom, as can be seen in figures 1 & 2, the outboard can be mounted at any position on the bracket.  However care should be taken to avoid Chimera II’s rudder.

Steam will be supplied to the engine via an insulated flexible hose which will be fitted with a 3/8” BSP male fitting.


Form of the Competition

The competition will be in two parts; a time trial and the judges’ selection for technical excellence.

1 - Time trials

The time trial will involve two timed runs around a course.  The faster of the two runs will be recorded.

The fireman of the host boat will attempt to maintain a boiler pressure of 100psi (likely to be lower at the engine).  The entrants are responsible for control of steam supply to the engine and for steering the boat around the course.

2 - Technical excellence

The judges will decide on their favourite entry, based on innovative features, quality of workmanship, presentation etc.  The judges’ decisions are final.


Location of the Competition

The competition will take place in the course of the Beale Park Boat Show which is on the 6th-8th June 2014.  Entrants can arrange for a slot to test and tinker with their entry before the judging and competition takes place.

Safety & Environmental Considerations

Entrants are responsible for their own safety when operating their plant.  It is suggested that you complete a simple risk assessment to identify risks of your design and take the necessary steps to mitigate against them.

The outboard motor must not pollute the environment and measures to prevent oil escaping from the outboard motor MUST be taken.  Minimal cylinder lubrication may be necessary but care should be taken that excess oil droplets do not find their way into the lake. The judges will need to be satisfied that your engine will not pollute the lake before allowing the engine on the water.

The judges and the fireman of the host boat reserve the right to stop the competition at any point for reasons of safety, to prevent damage to the host boat or other craft or to prevent pollution.


For more information or to register an entry for the competition (before 15th May) contact Kingsley Robinson at:

Phone: 07985 931299


Post: 13 Caer Castell Place,



          CF3 3PW

Awards Sponsored by Process Instruments

Click here for a printable copy on these instructions.

If you enjoyed this page then why not tell people about it?

Not been able to find what you were looking for?
© Steamboat Association of Great Britain 2020   Lost? Click on the logo to get to the home page.

Contact us  Privacy & Cookies  Terms of Use  Site Map

Powered by Wild Apricot Membership Software