MS-5 (oz16224)

About this Plan

MS-5 (Motorsegler-5). Radio control motor glider model. Twin boom layout. Wingspan 328 cm.

Note this is not a full size plan. Parts are shown at 100%, general layout is 50%.

Direct submission to Outerzone.

Update 22/8/2025: Added article, thanks to Pit.

Quote (google-translated): "The idea of designing and building a powerful and elegant motor glider as a twin-fuselage model with an inverted V-tail had been on my mind for years, and had been sitting around in the attic of my house in the form of half-finished experiments. The twin-fuselage is ideal for the engine placement with a pusher prop and, at the same time, for the innovative tail assembly. The propeller's airflow can pass unhindered, and the engine's position prevents the model from losing its glider-like character. I've always found the engine attachment annoying on gliders, and also on the other hand, the tail assembly design leaves much to be desired in the previously known, sluggish aircraft, as well as in the models.

My ideas therefore focused on constructing an extremely functional and aesthetically pleasing tail unit. The result was the inverted V-shaped tail unit as the roof tail unit. It firmly connects the two fuselages and is also lighter than a standard tail unit. However, this arrangement posed new challenges, because to prevent the tail unit ends from projecting, the fuselages had to be spaced far enough apart. This enormously increased the twisting tendency of the wing center section. Previous attempts with thin wing profiles failed. Because the model was intended to be flown as a thermal glider on the flat, a bi-concave profile had to be found that met all requirements. After several attempts, I decided on the Göttingen 497 with a 0° angle of incidence. This profile is equally suitable for motor and glider models, offers good climb performance, and is not too fast for thermal flight. It is also thick enough to build a connection-free, clever center section.

Finally, the moment had arrived. The model, balanced with its four-channel system, weighed 3200 g and seemed heavy for its wingspan of only 3.28 m. The sheer astonishment of the first hand launch on a gently sloping slope in almost calm air was perfect. With a long glide, the MS-5 took off in a dead straight line. Model building enthusiasts present spontaneously expressed their delight..."

Supplementary file notes

Article.
Instructions.
Servo installation notes.

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