Patent ID: 7918195

Claim:
A heat extractor for attachment to an air-cooled engine, the engine having a cooling fan extending from the engine and rotated by action of the engine, the heat extractor comprising: a first thermally conductive surface for attachment to the engine, the first surface defining a first midline substantially aligned with a second midline of the engine, and comprising a substantially flat first portion extending in a first direction from the first midline and inclined toward the engine and a substantially flat second portion extending in a second direction from the first midline and inclined toward the engine, the first direction opposite to the second direction; 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, and wherein flaps farther from the cooling fan are shorter than flaps nearer the cooling fan; a flared end region formed in the first surface and extending upwardly away from the engine, 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.