In 1951, Vespa's most prestigious record of "speed skiing" on February 9, between 10 and 11 miles highway Roma-Ostia. Vespa engine with two opposing pistons (power of 17.2 hp and 9500 rpm), which was designed by Corradino D'Ascanio and vehicle testers Mazzoncini Dino, a record-breaking "speed skiing" and recorded a time of 21:04 seconds, with an average of 171.1 km / hour. The machine has two crankshafts that are connected to gears that separated the two pre-press room with two carburetors, piston controlled intake and exhaust side magnet piston is controlled by the charter (31 767 Piaggio picture). Cooling liquid is on the left.