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Facts about MT-Propellers

Product Overview


Special Applications


Additional Information

MT-Propeller Facts

Comparison:
Natural Composite Blades - Single Piece Hub
vs
Structural Composite Blades - 2 Piece Split Hub + Grease Fittings


MT-Propeller Composite Blade

Structural Foam Composite Blade
1. Weight typical 5 bladed Turbo Prop Propeller
12% lower, app 143 lbs. (65 kg)
Typical blade with 88,5" diameter		 app. 160 lbs. (72 kg)
Typical blade with 88,5" diameter
2. Polar Moment of Intertia 5 bladed Propeller
30% lower, app 17760 lbsin2(5,2 kgm2)
Typical blade with 88,5" diameter 		app. 23225 lbsin2 (6,8 kgm2)
Typical blade with 88,5" diameter
3. Damping Coefficients
45% higher vibration damping coefficient equals to 0,0396 - therefore no grond or flight RPM restrictions A vibration damping coefficient of 0,0216 Ground RPM - limitations and possible in flight vibration limitations
4. Erosion Protection
2 inch wide Nickel Cobalt erosion sheath, bonded on the blade, protects it against rain, hail, ice, sand and stones. Less erosion protection due to the small nickel erosion sheath (less than 1 inch), but increased maintenance effort due to complex design.
5. Vibration
EXTREME LOW vibration due to high damping coefficient and lower moment of inertia



Is your propeller as smooth?
Three bladed MT prop MTV-9 on a Cessna 182P in FL85 at 135 KTAS.		 HIGHER vibration levels as a foam core has no vibration damping at all plus the higher inertia moment. Close to metal.
6. Service life
Unlimited because of the reparability, maintainig original dimensions during service life.
100 000 blades with more than 180 Mio flying hours		 Same service life expected. No long time experience available. Expensive overhaul costs.
7. Performance
Performance improvement
Special High Lift State of the art aerodynamic airfoils invented in close cooperation with the German aeronatic research institute DLR for better take off/climb and same cruise 		Performance in take off and climb are critical due to thin airfoils which tends to stall partially due to sharp airfoil leading edge.
8. Reparability
Unlimited replacements of erosion sheath.
Rebuilding of blad tips. Maintaining always original blade dimensions. 		Ground strike blade rapair limits unknown. Hub replacement mandatory.
9. Hub Design
Single piece low maintenance hub. No ADs, No re-greasing needed between TBO.
In field blade replacement on wing possible. 		2 piece hub with stress rising crack initiating grease fittings in the highest stressed hub area (blade bearing). Lots of ADs on those hubs. No on wing blade replacement possible.

More facts about the
Natural Composite MT-Propellers


  • Reduced Weight – MT Natural Composite Propellers are significantly lighter than aluminum propeller systems. This saves weight where it is most important, on the end of your engine crankshaft.
  • Reduced vibration – Aluminum supports harmonic vibration. Composite does not. Other parts of your plane (gyros, motor mounts, radios, heat muffs, cowlings) will have a longer life with reduced vibration.
  • Greater Strength – These are the same natural composite blades and hub that are used in our Unlimited Aerobatic Propeller Series. We also use stainless steel instead of aluminum for the leading edge guard.
  • Unlimited Blade Life – Metal props have absolute dimension limits. Every time you have a nick filed out and the prop dressed, you get closer to that limit. At some point it will exceed the use tolerances and must be scrapped. In addition, each time a metal prop is dressed, you will change the optimized performance dimensions established by the manufacturer. MT Propellers, when overhauled, are brought back to exact factory new dimensions.
  • Steel Hub Inserts – MT Propeller hubs use a steel bearing insert that is replaceable. Standard hubs wear against the machined aluminum and must be completely replaced when exceeding the tolerances.
  • Quieter – 3 blade conversions result in smaller diameter compared to 2-blade installations. Shorter blades run quieter than long blades due to the lower tip speeds. Another advantage of lower tip speeds is the maintenance of smooth airflow across the blades. This results in more lift/thrust.
  • Less Drag – A smaller prop arc disk has less drag than a larger diameter prop arc discs.
  • More Ground Clearance – A smaller diameter of the propeller installation will provide less chance of prop damage from objects picked up from the ground.
  • Adds Resale Value – Like air conditioning in a car, you get to enjoy the benefits while it is yours, then get back what you paid for it in the future.
  • Easy Installation– Simply bolt it on. Uses existing prop governor.
  • Full Warranty – 1 year or 1000 hours (which ever occurs first) for any manufacturing defects.
  • Choice of Colors – White, Black or Grey. Custom colors available with small up-charge.
  • Cool Look – Your plane will look faster and more modern with the sleek MT Prop hanging on the front.