Walter Turbine Otter Conversion

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See Also Voyager Air's Otter (125) with the Walter Turbine


The Walter Turbine Engine and Airframe Modification for DHC-3 Otters provides:-

751 SHP @ 2,080 RPM

3 Blade (106") or 5 Blade (90.9") Avia Hi-Thrust Prop Technology (Proven Engine/Prop combination)

Time Proven: Over 14 Million hours of operation

Over 30 types of Aircraft operating in 50 Countries

No hot section inspections or nozzle replacement required

State-of-the-art Computerized Trend Monitoring with individual "operator usage" cycle programs

TBO's can range from: 2,250 to 20,000 Cycles

50 US Gal Firewall forward extended fuel capacity

Cruise Speeds - Floats: 120 to134 VMO Wheels: 120 to 144 VMO

Comparable fuel burn to PT-6 (6.65lb/ESHP/Hr)

Useful Load: 3800 to 4000 lbs + (Approx.)

Turbine Bleed Air Heat System






Optional Engine Programs

  • TBO's
  • 2,000 hrs or 2,250 cycles (Standard with kit)
  • 2,000 hrs or 4,000 cycles (Upgrade)
  • 3,000 hrs or 6,600 cycles (Upgrade)
  • Hot/High Operation Conversion Kit

Walter M601E-11  - The other solution

The Walter M601E-11 was originally designed to match Russian conditions of heavy climate and lack of qualified engineers on site. This is why the engine is specific by its install-and-go philosophy. This means there are no "hot section" inspections, as with other products. These excellent features are making M601 more and more popular outside the original target market.

The reason the engine is not of modular design (but very rigid and heavy duty and is the reason why no complicated on spot repairs are supposed to take place). In fact there is no "On-Condition" maintenance scheme necessary and is actually not possible for technological reasons. There is only basic maintenance during TBO if everything is OK. So an engineer with no special experience is able to do all the maintenance himself after passing a 1 Week course in "WALTER". This is why this engine has attracted even non-professional flyers.

The TBO of WALTER M601E-11 is limited by whichever occurs first of the following:

1. Cycles: from 2,250 to 20,000 cycles OR

2. Flight Time: 2,000 or 3,000 hours or;

3. Calendar Time: 8 years



Walter M601 Turbo Prop Engine

The WALTER M601 is a two-shaft turboprop engine of reverse flow layout. The engine features two basic parts: the gas generator and power section. The gas generator consists of two stage axial and one stage centrifugal compressor, annular combustor and one stage axial turbine. An accessory gearbox with instruments necessary for engine operation and power control is situated on the rear part of the compressor air intake casing. An oil tank is an integral part of the accessory gearbox. The power section is mounted on the front part of the gas generator. This section consists of one stage axial turbine; exhaust system and two-stage reduction gearbox with a torque meter and propeller shaft. The propeller governor is situated on the reduction gearbox and provides the control of the hydraulic actuated propeller including the reverse thrust angle adjustment.

The engine is equipped with a system of electronic limiters, which protects the engine against overload. The engine is modified for installation of automatic feathering system.


Leading Particulars

WALTER M601E-11 is a model derivate for the basic M601E TPE. The FAA (USA) and the MOT (Canada) has certified this model. The engine has also been certified with the AVIA-Hamilton Standard VJ8.510 propeller unit fitted with an over speed limiter.

Take-off power:

751 SHP

Time Limit:

5 min

Propeller speed (T/O):

2080 R.P.M.

Equivalent specific fuel consumption:              

6.65 lb/ESHP/hr

Max. continuous power:

657 SHP

Propeller speed (cruise):

1700 to 1900 R.P.M.

Weight (dry):

445 lb


25.6/23.2/65.9 in


General Aviation

Aircraft Installations (to date):

Air Tractor
Ayres Thrush S2R
Beechcraft KingAir 90-Commuter
Grumman/Schweizer Ag-Cat
DHC-3T Otter

For Engine AD's & Service Bulletins Go To: