Stephen Wessel



Stephen Wessel’s latest aero engine is now complete. He reports: “My ENV engine is now running, somewhat to my astonishment! It has been five years in the building with many problems on the way.

“I have some short video of it in quite high res. No propeller yet so I keep the runs very short to avoid over heating.

“I think this is now the only working ENV engine in the world.”

It is a half size model of a very early Anglo/French engine dating back to 1910 by ENV. It is a V8 with separate cylinders, each jacketed in thin copper laid down by an electroforming process. It has one of the very first Zenith carbs and a very early Bosch magneto, which in the case of the model contains a modern electronic ignition set-up. The original engines were rated at 60HP and used by several pioneer pilots such as 'Tom' Sopwith, who said he became quite fond of it.

Stephen explains: “I decided to use a waterless coolant to avoid electrolytic corrosion. The flywheel was quite prototypical for engines that drove two propellers via chains; the flywheel fitted at the moment is temporary.

“I shall give it just one in place of the flywheel once all carburettor adjustments are done and the 'pilot' can retreat to a moderately safe distance!”

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