Initial flying tests showed promise but the owner of Ruhrtaler cancelled all aeronautical activity after his son was killed whilst demonstrating the Ru.3 to the Air Ministry.
[1] Around 1933, a manoeuvrable high performance single-seat advanced trainer was needed to train fighter pilots for combat.
The morning session was a success but during an afternoon exhibition of the Ru.3's flight characteristics Schwarz got into a spin and was killed.
Its one piece wing was built around a single wooden spar, with a plywood covering forward of it forming a torsion resistant box.
Its Argus As 8B four cylinder inverted inline engine was mounted on steel bearers attached to the forward end of the fuselage frame.
Both upper and lower fuselage cross sections were rounded and the sides appeared faceted, shaped by stringers.
The spatted mainwheels were mounted on long shock absorbing legs which leant inward to the upper longerons at the same points as the wing struts.