tread
a Spitfire PRXIX at Chino with a contra-rotating Griffon 57 - the reason being that, although it's not authentic
I am led to understand that a small number of Spitfire Mk21s and 22s were converted to run contra-props on the end of Griffon 85s.
LA218 and PK662 were examples, the former being the subject of an enthusiastic Boscombe Down evaluation. Apart form the fact that it wasn't as reliable as required.
sd