The official speed record for a
seaplane powered by a piston engine is , which was attained on 24 October 1934, by
Francesco Agello in the
Macchi-Castoldi M.C.72 seaplane ("idrocorsa") and it remains the current record. It was equipped with the
Fiat AS.6 engine (version 1934) developing a power of at 3,300 rpm, with coaxial counter-rotating propellers.
