Ace 0.5cc Diesel (oz13739)

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Ace 0.5cc Diesel.

For more on the Ace, see http://modelenginenews.org/ad/ace.html

Quote: "The ACE 0.5cc diesel was commissioned by Harry York, owner and manager of Model Aircraft Supplies Ltd, 171 New Kent Road, London SE1. The first press announcement for the engine we have been able to find appeared in the April 1947 issue of Model Aircraft. This one-third page splash is actually a pre-announcement, although it states that prototypes were in the field at that time. Note too the clever interplay of the company name, leading letters in the logo, and the tie-in to the company motto.

The engine features the usual long stroke of its sideport contemporaries, with a measured bore of 7.2 mm and a stroke of 11.1 mm for a stroke/bore ratio of 1.54 (a figure exceeded only by the Kalper and Foursome engines in my experience) and a displacement of almost exactly 0.5 cc. It weighs in at 2.125 ounces or 60 gm, complete with tank. When compared with its later 0.5 cc stablemates, it is undoubtedly on the bulky side and carries a fair bit of excess weight to boot—the original 1951 Allbon Dart weighed in at 1.25 ounces (admittedly without tank) and the ED Baby and Frog 50 models weighed 1.4 ounces and 1.25 ounces respectively with tanks. The later half cc models were also a good deal more neat and compact thanks to their die-cast cases, rotary valves and shorter strokes, and undoubtedly produced more top-end power as well..."

Direct submission to Outerzone.

Note main pic from Adrian's Model Aero Engines site, see https://www.adriansmodelaeroengines.com/catalog/product.php?cat_id=33&pid=107

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