Amongst many racing successes, Rowsell won the Merlin Rocket Class Championships at Abersoch Wales in 1978, crewed by Jon Turner, with a series of results which have not been surpassed by any later Champion of the Class.
Rowsell achieved significant success in racing, including winning the Merlin Rocket Class Championships at Abersoch, Wales in 1978 with Jon Turner as part of a team that has not been surpassed by any subsequent champion of the class.