Some time ago, we posted a scanned article on Makhonine fuel tests. This article is available on this page.

This article was difficult to read, so the texts were transcribed in much more readable texts:

Part 1: two aviation tests.
Part 2: notice of Makhonine himself and an 3th aviation test.

As a reminder, Makhonine fuel is a fuel resulting from the liquefaction of coal (even of poor quality), it is a bit of Fischer-Tropsh before its time (the tests date from 1926). In addition to being very economical and completely independent of petroleum, this fuel also had very good physicochemical properties, including a high fire / flash point (not flammable at room temperature) and a density close to that of water.

Its use apparently also allowed (compared to the essences of the time) a gain in consumption of 30%.

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Part 1: two aviation tests.
Part 2: notice of Makhonine himself and an 3th aviation test.
Explanations on Makhonine fuel
Subject on the forum