last update October 23, 2013

Hydraulic constant speed MT-Propeller

2-blade hydraulic constant speed propeller
Model No. max. Diameter max. Power max. RPM
MTV-2*
MTV-11
(.pdf, 100k)
193cm/76in 160HP 2800
MTV-15
(.pdf, 111k)
210cm/84in 300HP 2700
MTV-21
(.pdf, 105k)
180cm/71in 120HP 3400
MTV-33-1
(.pdf, 240k)
178cm/70inch 115HP 2560

(*no longer in production, replaced by the MTV-15)

3-blade hydraulic constant speed propeller
Model No. max. Diameter max. Power max. RPM
MTV-3*
MTV-6
(.pdf, 100k)
190cm/75in 180HP 2800
MTV-9
(.pdf, 120k)
260cm/102in 590HP 2800
MTV-12
(.pdf, 110k)
203cm/80in 300HP 2800
MTV-34-1
(.pdf, 440k)
178cm/70inch 115HP 2560

(*no longer in production, replaced by the MTV-9)

4-blade hydraulic constant speed propeller
Model No. max. Diameter max. Power max. RPM
MTV-4 335cm/132in 2200HP 1440
MTV-14
(.pdf, 110k)
195cm/77in 483HP 2700
MTV-16
(.pdf, 110k)
260cm/104in 850HP 2200
MTV-22
(.pdf, 104k)
175cm/69in 210HP 2800
5-blade hydraulic constant speed propeller
Model No. max. Diameter max. Power max. RPM
MTV-5
(.pdf, 115k)
220cm/86.7in 590HP 2700
MTV-8
(.pdf, 105k)
600cm/237in 2000HP 2000
MTV-25
(.pdf, 110k)
180cm/71in 450HP 2700
MTV-27
(.pdf, 105k)
250cm/98.5in 1280HP 2200
MTV-28
(.pdf, 50k)
600cm/237in 5000HP 750
6-blade hydraulic constant speed propeller
Model No. max. Diameter max. Power max. RPM
MTV-19
(.pdf, 105k)
185cm/73in 500HP 2700

Hydraulically controlled constant speed propeller

Our hydraulic constant speed propeller installations are certified as 2-, 3-, 4-, 5- and 6-blade models for engines producing up to 5000 hp, that have an hydraulic oil supply to the propeller controlled by a governor.
All our hydraulic propellers are optionally available with our patented feathering and /or reverse system and can be equipped with electric or alcohol de-ice boots.

The single piece hub is made from forged or solid aerospace aluminum alloy. It is corrosion protected and the hub's outside can be additionally painted for sea applications.

The blade bearings are special design ball bearings, where the balls act as split retainers for holding the blades into the hub, which creates an increased safety factor against blade loss.

The propeller construction has a simple and light-weight design without any unnecessary part.

All weights required for static propeller balancing are installed on the front spinner bulkhead.

Presently most of our blades are built in natural composite design, by using high compressed thin layered laminated beech wood, which has a similar tensile strength as steel, in the root section and selected lightweight laminated spruce wood in the remaining part of the blade.
The wooden core is reinforced by layers of epoxy fiberglass, Kevlar® or carbon fiber and sealed by several coatings of acrylic-polyurethane paint.

An aluminum blade ferrule is attached to the blade root by using special design patented lag screws.
The pitch change of the blade is enabled by an excenter pin installed in the blade ferrule.

Propellers for aerobatic aircrafts or propellers built with feathering capability are equipped with counterweights, which are installed on the blade ferrule.

The critical section of the blade's leading edge is protected by a bonded on stainless steel erosion sheath.
The inboard section of the leading edge is protected by a self-adhesive PU-strip. All of the above makes the blade all weather operable.

The spinner dome is a single piece part made from fiber reinforced composite (Kevlar®).
It is extremely crack resistant as well as very light weighted.

The servo pressure necessary for changing pitch is generated by a gear pump located inside the propeller governor.

The propeller system is single acting.

An unfeathering accumulator, which is directly connected to the propeller governor, is optionally available for Feathering Propellers.