Several North American Mustangs raced in the Unlimited Class races at the Reno Air Races have been fitted with Griffons. These include the RB51 Red Baron (NL7715C),[31] "Precious Metal" (N6WJ) [32][33] and a Mustang/Learjet hybrid "Miss Ashley II" (N57LR).[34] In all cases, Griffons with contra-rotating propellers, taken from Avro Shackleton patrol bombers were used in these aircraft. The RB51 Red Baron is noteworthy for holding the FAI piston-engine 3-kilometre world speed record from 1979 to 1989 (499.018 mph).