Well here I go again. My friend Gil has been after me for a couple of months to make some cylinder heads for an O. S. 25 FX engine for his combat planes. Well I finally got around to making them. They are made to use a Nelson glow plug. We tested one yesterday and it produced 1300 more rpm than the stock head with an 8 x 4 apc prop. I have it mounted on an old engine case just for fitting purposes.
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