MAN Simplex 25 (oz13749)

About this Plan

MAN Simplex 25. Model aero engine.

For more detail on the Simplex 25 see http://modelenginenews.org/design/design8.html

Quote: "The SIMPLEX 25 was serialized over the March and April issues of Model Airplane News for 1947. The design and articles are credited to Louis Garami; the plans (one page in each issue) to Jay Thomas Holmes. The SIMPLEX is a 0.25 cuin (4.2cc) spark ignition engine designed to be built from readily available materials on minimal equipment. In the words of the designer, 'the simplest design consistent with good results.' The text went on to say that it was assumed that the reader/builder had reasonable knowledge of lathe operations. This was not an unreasonable assumption for the America of 1947. I suspect the case today is very different.

This is the earliest home-construction engine for first-time constructors we've examined in this series, so even though aspects of the design shows features with which we will be familiar, it is the SIMPLEX that should be considered the archetype for other bar-stock designs. While it has a number of things in its favour, one design choice is so unusual that at first, I thought 'no way!' But after some reflection, I decided it was a good idea. Finally, after even more critical thought, I'm stronger against it than ever before - we'll get to why later. To start with, let's list the positives and negatives from a perspective of the guidelines we've established earlier for things that make a engine suitable for the first time builder..."

See also: https://www.rcscrapyard.net/au/simplex-spark-ignition-engines.htm

Direct submission to Outerzone.

Supplementary file notes

Article.
Article (MAN 1947).

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