Sycomoreen is showing you the Concept of Stirling engine with Rotary Annular Trilobic Pistons (SPRATL). The machine with rotary annular trilobic piston (PRATL machine) is an original invention of Pascal HA PHAM. Its rotary and bi-stacked features with unequal volumes have lead SYCOMOREEN to turn them into a radically new design : the SPRATL.

Watch the naturally energetic movement on http://sycomoreen.free.fr