MT-Natural Composite Blade
Structural Composite Design
MT-600-Series Full Carbon Blade
MT-500-Series Full Kevlar Blade
Due to the unbeaten vibration behavior no ground rpm limitation and in flight rpm limitation must be established for certified MT-Propeller installations using the natural composite design.
During the take-off run a 8 lbs Stork impact , minor damage on the propeller, aircraft was ferried for 2 hours back to the home base after the impact.
Severe Lightning Strike in flight on a Turboprop propeller blade has minor damage and can be overhauled and returned to service.
Blade Tip and mid blade, minor damage.
Belly of the airplane with a burned spot
and vaporized paint after the lightning left the airframe.
The MT-Propeller natural composite design is the only blade design selected by Griffon Hoverworks (biggest Hovercraft manufacturer in the world) after testing structural composite blade versus the standard MT natural composite design. Since year 2013 MT-propeller is the only supplier of Propellers for all new Griffon Manufactured Hovercraft.
Propeller diameter up to 3,5 m (11,5 ft) are in use 3,500 hours per year without any life limitation and red bands in the harshest environment with salt water and sand.
Identical blade design are used for aircraft propeller and vise versa.
Aerospace grade carbon fiber combined with highly compressed beech/spruce wood core has a higher strength than aerospace aluminum with no corrosion and fatigue limit.
The MT-blade has no spar for the load carrying core.
By this, FOD on leading edge or trailing edge as well as the blade mid area can not create a structural damage requiring the replacement of a blade.
MT-Propeller natural composite blades are certified for unlimited life and can be repaired in the field or at 60+ overhaul shops worldwide.
MT airfoils are designed for a relative thickness between 3 to 10% depending on local MACH number. The propeller is designed to operate below supersonic so a certain relative airfoil thickness is needed to create the most thrust.
Thin airfoils are subject to stall flutter.
De-Ice Boots are integrated in the airfoil to keep the original shape.
By this no extra drag from De-Icing is created on MT Turboprop blades.
Not standard and available on structural composite blades.
MT - Natural Composite Blade
Structural Composite Blade, with load carrying spar.
In case of damage the blade must be retired.
Numerous windtunnel tests within R&D programs for Airbus as the selected supplier for the Airbus Racer and City Airbus by Airbus Helicopter has refined together with the Research Institute DLR (German Research Institute) and ONERA ( French Research Institute) the best capability to improve the overall performance using MT proprietary aerodynamic software.
Better take off, better climb with high top speeds are the result.
For this, AIRBUS Helicopter has selected MT-Propeller as the supplier for the two 250+ Million Dollar R&D programs.
On the LH side the typical protection of a MT natural composite blade with a 2 inch wide Nickel Leading Edge vs a structural composite blade nickel protection on the RH side.
Natural Composite Blade
Structural Composite Blade
Shown are cross sections from
MT-Propeller and typical structural composite blade.
Same thickness outside the spinner shape for minimum drag.
Independent lag screw system with up to 11 lag screws are installed in the blade root. The MT cross section shown is typical for turbo-prop construction.
No homogeny single structural material which can be damaged by FOD.
FOD on the load carrying composite shell for a structural composite blade may result to a structural damage with the need to retire the blade.
So far this never happened to a MT natural composite blade due to the unique manufacturing technology using different materials.
Capable of achieving ~10x CF loads. No Life limit in the blade retention has been introduced by the Certification Authorities.
The MT design is certificated for the bird impact conditions calculated for the most critical flight condition (take-off rotation) for that installation
The test is performed at the most critical locations on the blade.
Important factors to be considered:
No significant structural damage is allowed….
Propeller must be controllable and continue to provide thrust without causing a hazardous effect.
Up to 90% of the European manufacturers and up to 30% of the US manufacturers use the MT-Propellers for new production aircraft.
Since MT-Propeller was established in 1981 more and more manufacturers changed to our system.
Since the first introduction of the 5 bladed propellers in year 1995 more than 2000+ turboprop applications like the latest OEM RUAG 228 NG, GROB 120 TP and King Airs, Jetstream, Metroliner, Cessna and many more using MT-Propellers.
It has been become an industrial standard with approximately 350+ 5 bladed Propellers shipped per year.
More than 220 STCs are available worldwide from MT-Propeller to upgrade any aircraft to a more modern higher performance, lower noise, lower weight propeller system.
With the advantages of the MT NATURAL COMPOSITE design compared to structural composite and aluminum blade materials also certified and manufactured by MT-Propeller, the majority of the MT powered aircraft using the natural composite design.