Hi Matthias
We are still operating an Alvis Leonides in a Percival Provost.
These engines are not used by many aircraft. The same basic engine was used in the Percival Prince with some fuel system differences. Also in the Percival Provost but with different back cover for ancilliaries and different oilways for inverted flight. The Twin Pioneer is different gearing, stroke and you cannot convert these engines. If I remember correctly the German Bundeswehr had Dowty Rotol Propellers unlike the RAF Pembrokes which had deHavilland props. Do you still have the engines and the propellers?
Andrew Edie
[email protected]
I saved this from a website back in 2005 - someone had nine for sale.