And there was Miss Supertest III.
Miss Supertest III was a Canadian hydroplane designed and built by Jeff Thompson that won the 1959 Detroit Memorial Regatta and the 1959, 1960 and 1961 Harmsworth Cup races—the only four races it ever entered. It was the only three-time Harmsworth Cup winner and the first non-U.S. winner in 39 years.
It was powered by a RR Griffon mark unknown.
Wikipedia:
https://en.wikipedia.org/wiki/Miss_Supertest_IIIIt is currently on display in the Jet Aircraft Museum in London, Ontario.