Plan: 9 Cylinder Radial Engine


Construction plan of the 9 Cylinder Radial Engine by Martin Ohrndorf

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Order here the construction plans for your replica of the 9 Cylinder Radial Engine!

The construction plan consists of six format DIN A3 sheets with a presentation of the individual parts as well as two sheets in the same format with the views i.e. cross-section of the complete engines. In addition there is are several pages of specifications containing part lists of all parts. There are also suppliers addresses listed for e.g. ball bearings, cogwheels or valve springs.

The plan is very precise and shows all parts in a comprehensible form.

Many feedbacks including photos of engines constructed by customers confirm that they have been successfully reproduced.

However, a lathe and milling machine is necessary for the manufacture.

Technical data of the engine

Bore 23 mm
Stroke 24 mm
Capacity 90 ccm
Weight approx. 4000 g
Revolutions approx. 950 – 5000 1/Min.
Valve diameter 9,5 mm
Valve lap 28 degrees KW
Outer diameter approx. 250 mm
Width approx.
Height approx.
Length approx. 140 mm
Propeller size up to approx. 26×10 inch

The engine is a multi-cylinder 4-stroke glow igniter, which was developed by myself. Except for the carburetors, no parts from other engines were used, each component is my own design.

The engine is air-cooled and operates with mixed lubrication (methanol and synthetic oil). It is designed as an aircraft engine, but is not based on any particular model.

The mounted 9 Cylinder Radial Engine

The 9 Cylinder Radial Engine is used in a replica of a Heinkel He50 from 1932. Below you can see photos and a video clip of the aircraft and the 9 cylinder radial engine.

Images of individual parts

Additional information


English labels, German labels


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