Compared to Whittle designs, the H-1 was "cleaned up" in that it used a single-sided compressor with the inlet at the front, and a "straight through" layout with the combustion chambers exhausting straight onto the turbine. Whittle's designs such as the Power Jets W.2 used a "reverse flow" layout that piped the hot air back to the middle of the engine, in order to "fold" it and reduce its length and to reduce the turbine entry temperature, a safeguard necessary for the turbine materials available when Whittle was designing the engines. Although it eliminated the Whittle-style "folding", the Goblin was still a very compact design.