WhisperGen are difficult to find in the States, I looked into it in the past and was quoted $12k for a boat version that ran off of diesel. These were also only producing 800w of electricity.
Talking to the folks that worked at WhisperGen, the wobble yoke design added extra complications and tolerance issues that added to the cost.
Talking to the folks that worked at WhisperGen, the wobble yoke design added extra complications and tolerance issues that added to the cost.