See: O.S. Engines

To commemorate Ty Tessmann winning at the 2018 ROAR NATS and to keep up with growing demand from users, O.S. have decided to release the SPEED B21 Ty Tessmann Edition. The Ty II is based on B2101 with a special 5.8mm carb restrictor, which is his favorite. The engine features also a low- profile head of Ty’s original design, with a new shape and double height vertical fins compare to the latest B2102. The O.S. Speed B21 Ty II nitro engine will be available in October and wille come in combo set including a 90mm long manifold with the T-2090SC or separately in a limited quantity of only 300 engines.