Hemingway Kits
The Hemingway Engine Bay
Internal Combustion
The IC Engines
The Wyvern - Edgar T Westbury
The Wyvern
Ref: Wyvern
The Wyvern is a horizontal, open crank stationary engine of the type that played a very important role in the mechanisation of industry.
Otto cycle engines, burning gas or petrol, rapidly replaced steam plant for small and medium sized applications from around 1880 onwards. The first Otto engines borrowed many of their structural features from contemporary steam engine practice, including the open horizontal frame of the orthodox mill engine. Crossely Brothers, the UK licensees of the Otto patents, were responsible for a number of important improvements including poppet valves and the clerestory combustion chamber. Westbury included all of these features in the Wyvern which was designed and launched in 1963.
With a displacement of 40cc, the Wyvern was designed to run at a constant 1,500 - 2,000rpm. Lubrication is from 3 wicked oil cups and the cylinder is water cooled. The completed engine measures 12" x 8" x 6" wide across it's two Ø6 ½" iron flywheels. The generous proportions (Bore x Stroke = Ø1¼" x 2") and simplicity of the open crank design allow this to be recommended as an engine project for new comers. With a majority of its workings exposed, it must also be said that a running Wyvern engine provides much eye-appeal!
Wyvern - Drawings & Construction Notes
Ref: HE 2504
A set of 3 A3-size drawings together with the original construction notes compiled by E T Westbury, some particularly useful observations from R V Hutchinson and more recent build details from Peter Rawlinson; 23 pages in all.
Price:
£25.00
The Wyvern - Material Kit
Ref: HE 2500
The Wyvern material kit includes the vast majority of items required to complete the engine as originally designed. Electrical components (points, coil, spark plug...) can be found separately in the IC Engine Accessory section and plans and construction notes can be ordered above.
The bill of materials for the Wyvern material kit includes:
· (18) Aluminium, gun metal and iron castings
· (2) Iron Piston Rings
· (2) Valve springs
· Skew gear pair (2:1) required to drive engine's camshaft
· (25) Sawn lengths of bar material (free cutting and stainless steel, bronze, cast iron, brass, Tuffnol, silver steel and spring steel)
· BA hex nuts
Price:
£286.50
The Wyvern - Castings ONLY
Ref: HE 2505
If you want to minimise shipping costs or if you are particularly well stocked with supporting materials, you may prefer to order just the essentials. This item buys the 18 castings available for The Wyvern:
Bedplate, Subplate, Cylinder Jacket & Head, Bearing Cap, Exhaust Valve Guide, Inlet Valve Housing, Roller Guide, Inner Camshaft Bracket, Piston, Big End Bearing, Rocker Arms, Bracket, Oil Cap, Carb Body, Flywheels(2)
Price:
£195.00
