Live Steam 
Single Cylinder Half Beam Grasshopper Model Steam Engine 
Fully Machined Kit in Brass, Bronze and Steel 


The Half Beam or Grasshopper Steam engine utilises a beam anchored at one end instead of being pivoted on a central column as in the orthodox type of beam engine. The advantage of this arrangement is that it is more compact.


The piston end of the beam is guided in a straight line by means of parallel motion swinging links and pivoting end support attached to the opposite end of the beam and anchored to the base plate.


Though simplified, the engine has all the basic elements of half beam or grasshopper engines which were used by industry in the early part of the industrial revolution. These engines were also used in marine applications such as the first commercially successful steamboat, the PS Comet of 1812.


NOTE: Oak base not included. Pictures are of the finished, assembled and painted model, this listing is for the kit of parts, see picture. Also shown is the optional pulley wheel.


The half beam engine's parallel motion, eccentric driven valve mechanism and large steel flywheel make this engine fascinating to watch, particularly at slow speeds.


The engine includes triple split bronze pedestal bearings for the crank shaft, split bronze connecting rod bearings, steel A frame, beam end support, substantial base plate and legs.


The cylinder assembly, chest, inlet/outlet pipes, eccentric rod and piston are manufactured from brass and the piston shaft, valve, valve mechanism, connecting rod and parallel motion links from stainless steel so are not susceptible to corrosion. The piston shaft passes through an adjustable gland.


All required hex head setscrews are included in the kit. NOTE: some screws will need to be cut/filed to length to complete the model.


Each part in the kit is carefully precision made and checked to ensure reliability in service.


Detail Specification:

- Type: Grasshopper
- Bore: 14mm
- Stroke: 24mm
- Flywheel Diameter: 120mm
- Valve type: Piston
- Height: 180mm
- Length: 180mm
- Width: 120mm
- Weight: 2Kg
- Connections: 1/4" x 40 tpi ME


The kit consists of a set of fully machined parts that can easily be assembled using simple tools such as a screw driver, spanner, allen keys, pliers and metal file. The parts are mainly unfinished metal and will also require painting, polishing, filing, etc. to achieve the appearance shown in the pictures.


When assembled the engine is fully working and can be run using steam or simply using compressed air e.g. from hand or foot pumps.


To power the engine with live steam, connect it to one of our Model Steam Boilers.



Single Cylinder Half Beam Engine Kit

  • Product Code: HBSA
  • Availability: 1
  • £390.00


Available Options


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Tags: Live Steam, Model Steam Engine, Fully Machined Kit, Half Grasshopper Beam Engine