Walter M601-B 760hp Turboprop Engines

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Listen to the sound of an M601-B (273Kb)

The Walter M601 range of turboprop powerplants were originally manufactured in 1977 and designed for use in remote parts of Russia, Siberia, Africa, America and Eastern Europe, where rugged durability and minimal field maintenance requirements were top priorities. The engines have been widely used in twin-engine Let 410 aircraft for commuter and cargo operations. These engines are also suitable for the following types of aircraft Piper Malibu, King-Air, ST51 Mustang, Comp Air 7 & 10, Legend, Malibu, Navion, and Lancair 4P. The M601-B’s have been superceded by newer models and therefore are no longer in production. Unlike some turboprop engines, 'hot section inspections' between overhauls are not required with the M601 range. Maintenance between overhauls consists primarily of filter and screen cleaning, compressor wash, oil change, borescope inspection, ignitor replacement, testing and calibration.

The Walter M-601B engine is a dual-shaft reverse-flow free turbine engine. The gas generator section consists of two axial and one centrifugal compressor stages, an annular combustion chamber, and a single stage axial compressor turbine. The power section consists of a single stage axial power turbine, exhaust system, and a two stage planetary reduction gearbox (15:1) with torquemeter. Engine starting is accomplished using a combination starter-generator and electronic ignition (dual low voltage torch ignitors). An accessory gearbox is mounted on the rear of the engine. The propeller is a Czech. S.S.R V-508B 3-blade full-feathering constant speed type with aluminum spinner.

Turbine engine reliability and performance has long been desired by, but rarely available to the general private pilot community. The Walter M-601B is an outstanding engine in its own right and until recently, was largely found on Let 410 passenger/cargo and Let 19 aerobatic aircraft. Now, as commercial operators upgrade to newer powerplants in the Walter M-601 range and thanks to the expertise and experience of the Vertical team in Kharkov, Ukraine, a unique and extremely capable modification of the original stalwart Yakovlev 18T is available, the T-1 and it is fitted with the 760hp Walter M-601B Turboprop!

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The M-601B weighs just 190kg (418lbs) and in the T-1, will offer an operating cruise configuration in the region of 170kts/320kmh at approximately 80lph/17.5-18gph. The recommended Time Before Overhaul (TBO) for this engine is defined in engine start 'cycles', flight time and calendar time. Factory recommended TBO intervals vary from 2,250-20,000 cycles (depending on type of service and engine series), from 1,500-3,000 hours flight time, and from 5-8 years calendar time between overhauls. However, 300hr inspections are advisable. Before supply, the M601-B engine on the T-1 will be fully overhauled and zero timed i.e. time Since Major OverHaul (SMOH) will be 0 hours.

For reference, even though the M601-B engine has been superceded, it still retails close to $50,000-$55,000 for new units. Due to the high operational serviceability of these engines, even overhauled units are found to be in the $35,000-$40,000 range. Yak-Aviation.com have used and overhauled M-14B, M-14P and M601-B engines for sale.