A heat extractor for attachment to an air-cooled engine. A cooling fan extends from the engine and is rotated by action of the engine. The heat extractor comprises a first thermally conductive surface for attachment to the engine, a plurality of flaps extending from the first surface, wherein when the heat extractor is attached to the engine the flaps extend away from the engine, a flared end region formed in the first surface, the flared end region nearest the cooling fan when the heat extractor is attached to the engine and wherein rotation of the cooling fan causes air to be drawn across the first surface, the plurality of flaps and the flared end region.