The Riley International Corporation of California has been involved in the conversion of commercially produced light aircraft for many years. Among the types converted have been the de Havilland DH.104 Dove, 30* of which were converted from 1963 to take 2x 400hp(298kW) Turbo Lycomings. They had a maximum take-off weight of 8800lb(3995kg) and were designated Riley 400. The de Havilland DH.114 Heron, 20* of which were converted to take 4x 290hp(216kW) Turbo Lycomings from 1967 and designated Riley Turbo Skyliner. The Handley Page HP.137 Jetstream 1, a small number of which were converted to take 2x 940shp(701kW) Turbomecas from 1975 and designated Riley Jetstream. The Riley Twin Navion (19 built) was the first twin engined conversion of the Ryan Navion, being powered by 2x 150hp(112kW) Lycomings. The Cessna 310A/G has been re-engined with 2x 260hp(194kW) Turbo Continentals and with a maximum take-off weight of 4830lb(2192kG); designation is Riley 65. Another Cessna 310 conversion is the Riley Rocket which is powered by 2x 290hp(216kW) Turbo Lycomings. The Riley Super 310 is powered by 2x 310hp 231kW) Turbo Continentals. The Riley Rocket 340 was a conversion of the Cessna 340 to Cessna 340A standard. The Riley Super 414-8 was a Cessna 414 re-engined with 2x 400hp(298kW) Lycomings and with a maximum take-off weight of 6825lb(3098kg). The Riley Turbine Eagle was the Cessna 421C converted to take 2x 750shp (559kW) Pratt & Whitneys and with a maximum take-off weight of 7700lb(3495kg). .

N1MF                   c/n 421B-0872                    USA

8 seat business aircraft first flown in 1978

Engines: 2x 700shp(522kW) Lycoming LTP 101-700                                                                        Dimensions as for the Cessna 421B.                                                                              No.built: 50+ Range: 1496miles(2407km)                                                              Cruising speed: 300mph(482kmh) Empty weight: 440lb(1997kg)                                                Maximum take-off weight: 7650lb(3470kg)

                                      OO-IBJ                     c/n 215

Illustrated below is an example of the Riley Twin Navion.

                                      N22Y c/n TN-9

An example of the Riley Rocket is shown below.

                                     N1246G                c/n 310Q-010

A Riley 65 is illustrated below.