"Dale Scroggins" wrote

The SmartCar aluminum diesel engine and the Toyota Yaris engine (Europe,
aluminum diesel) might be good candidates for small aircraft. However,
this Subaru seems to be an ideal candidate since its power and weight
specs fit so many available airframes. PRSUs are also available. I
suspect we will see these engines installed fairly quickly in European
experimentals.

No need for a PSRU. The torque band makes it perfect for direct drive.
--
Jim in NC