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DG1000/2
On Thu, 11 Dec 2008 11:27:10 -0800, vontresc wrote:
A running 1/5th scale Merlin. Be sure to check out the video on this page as well. http://www.enginehistory.org/merlin_xx.htm I assume that there's only ever been one of these. I remember seeing it at the Model Engineer Exhibition the year it won the Gold Cup (1983 as near as I can work out), and again the next year when it was run. I'm told that Barry Hare had previously won a Gold Cup for the three blade constant speed propeller that was fitted to the engine for static display. It ran beautifully, though afterwards we were told that it had three problems: - the scale cooling channels were too small for effective cooling, so it could only run for short periods. - the supercharger didn't work though it spun up because the clearances were too big for the 1/5 scale blower to generate useful pressure. - the starter didn't have enough power for a start. The engine was hand-started when I saw it run. I have to say that, at that scale it ran at a lot more than scale rpm and so sounded more like a multi-cylinder motorbike than a full size Merlin. That period was the high water mark for the ME Exhibition - the year before the Merlin won, Lew Blackmore had won the Duke of Edinburgh's Cup (the prize for the best of the previous year's Gold Cup projects) with a 1/5 scale Bentley BR2 rotary engine. The next year it was there again and being run. That was impressive: it swung a big prop at more or less full size revs, producing a lot of slipstream and having the characteristic hissy exhaust note of a full scale rotary. Nonetheless, I still think that Merlin is the most impressive piece of model engineering I've ever seen or hope to see. -- martin@ | Martin Gregorie gregorie. | Essex, UK org | |
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