RBU 350 Waldläufer

1938 Ardie RBU 350 Waldläufer Technical Analysis & Specification Breakdown

Engineered by Ardie for the allround motorcycle segment, the 1938 Ardie RBU 350 Waldläufer utilizes a 343 cc (20.9 cu in) air-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 10 HP (7.3 kW) at 4,500 rpm, transferring power to the rear wheel through chain final drive. With a specific output of 29.2 HP per liter, the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.

On the scales, the RBU 350 Waldläufer measures 135 kg (298 lbs) dry, translating to a power-to-weight ratio of 0.07 HP/kg (13.5 kg per horsepower).