R/C Engine Models
by Paul Butler

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Mercedes D.III Engine

Kit: Scratch (1:5)

The attached images are of a 1/5 scale Mercedes D.IIIa engine project I started a few years back for eventual use as a dummy engine in 1/5 scale R/C models.
The prototype depicted is way too heavy for a flying model but it proved the concept.
The next stage is to improve some of the patterns (notably the engine cylinder) and use 'hollow' (where possible) balsa wood cores to reduce the wall thickness of the urethane plastic, 'hopefuly to 1 - 1.5 mm'.
Of the models in my project list, only the Albatros D.III and D.Va will require more than the valve gear, air pump and the very top of the engine cylinders so the added weight should be acceptable.
Note: urethane plastic has a specfic gravity slightly more that unity, ie. it is a little heavier than water.

For those who might be interested, the salient details are:

Patterns are yet to be made for: