The Gnatsum (Mustang spelled backwards) is one of many wooden homebuilt designs from Romanian designer
Marcel Jurca. Jurca, a
Henschel Hs 129 pilot in World War II, expanded his warbird replica designs to include the Allied
North American P-51 Mustang fighter. The Gnatsum is a low-wing, cantilever monoplane with an enclosed single-seat cockpit and manually retractable tailwheel landing gear based on that of the
Jurca Sirocco. Suitable for a number of engines around , plans for the Gnatsum are available as the 2/3 scale MJ-7 and the 3/4 scale MJ-77, as well as the MJ-70 full-size representation. All versions are constructed from wood with fabric covering, and manufacturing rights to the kit aircraft were acquired by
Falconar Avia. Plans for the MJ-77 are available from Avions Marcel Jurca. Some of the engines suitable for the MJ-7 Gnatsum series are:- •
Ranger 6-440C-5 inline engine •
Menasco C4 •
de Havilland Gipsy Major I •
Rambler aluminum block in-line 6 •
General Motors aluminum V-8 ==Variants==