I don't think any Merlin engines supported contra-rotating props, although as noted above some reverse rotating props were made for twins. The Spitfires with contra-rotating props had Griffons.
(The Griffon was a much larger capacity engine than the Merlin, but same external size, and was designed as a drop in more powerful replacement in 1940, but did not catch up to the Merlin in power output until 1945.)


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Then they have to forcibly be fitted with Prison GPS Bracelets.

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