Patent ID: 6877315

Claim:
A Stirling engine having a heat transfer head having an axis of reciprocation, the head comprising a plurality of external fins providing a first set with each fin projecting out from the heat transfer head and having a length, a first side and a second side and at least two of the adjacent fins being arranged such that at least a portion of their lengths are substantially parallel and arranged such that at least a portion of any radiant heat received on a side of one of the two adjacent fins is reflected onto a side of the other fin, wherein a second set of fins is provided above the first set, each of the second set of fins having a length, a first side and a second side each of the second plurality of fins being positioned in a plane, in use, extending in the direction of the axis of reciprocation of the heat transfer head, and wherein neighboring sides of two adjacent fins in said second set of fins diverge as they extend away from the heat transfer head.