Mustfire (oz16199)

About this Plan

Mustfire. Radio control sport pattern plane. Wingspan 172 cm.

Note the Mustfire (oz6365) from SEMO dates back to 1963. This here is a later redrawn plan in vectorPDF format from Modellismo, circa 2018.

Quote (google-translated): "F3A Vintage: Mustfire. Straight from the prehistory of RC aerobatics, a multi-channel with elegant and aggressive lines but a very good nature, reworked for us with CAD by Tristano Perotta.

The Mustfire is one of the most representative models of the early years of RC aerobatics. Although it is virtually unknown in Italy, in Sweden - where it was designed in 1960 by Jesper Von Segebaden - and in England, where a few years later it was produced in kit form by the legendary Frog, it was a very popular model both for its elegant lines, vaguely inspired by the Mustang and the clipped-wing version of the Spitfire (hence its name), and for its excellent flying qualities, which made it a very competitive model for the aerobatic program of the time.

The Mustfire's first official appearance took place at the 1962 World Championships in England, piloted by Per Eliason, who finished 15th. Until 1967, the year in which it participated in the legendary Ajaccio World Championships and the rights to the kit were sold to Frog, the Mustfire was produced in Sweden by a local company SeMo which included Von Segebaden's original drawings with the kit, which are now easily found online.

We entrusted them to the care of Tristano Perotta, who expertly restored them, translating the notes and captions, converting them into metric measurements, but leaving them absolutely unchanged. By doing so, he created a small masterpiece because, despite having been reworked with CAD, as you will see, they retain the flavor of the traditional drawing intact. Obviously, anyone who wants to build the model will have to update some things, such as installing wing servos for the ailerons in place of the central servo links and possibly modifying the engine mount if you wish to use a four-stroke engine, as in the model under construction in the photos, or even convert it to electric.

With a wingspan of 172 cm and a surface area of approximately 51 dm2, the Mustfire flew very well with a 10 cc engine of the time. The drawing indicates the Merco 61, a robust engine, very popular in England. The profile, as was common at the time, is a thick asymmetric biconvex (12%) and the design features two different landing gear solutions, although the bicycle is the most commonly used and, in our opinion, also more in keeping with the model's World War II fighter lines. The construction is very rational and accessible to anyone familiar with traditional structures.

With its large wing area and marked dihedral, today the Mustfire is a quiet model for Sunday flying, capable of giving its builder many hours of enjoyable traditional aerobatics."

Supplementary file notes

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