Not only the asymmetrical airfoil of our blades does make the difference compared to the conventional used blades made out of fiberglass or metal, but especially the new materials CFK/Keflar and the production process.
Producing blades the conventional way there is always a problem built it torsion resistant with some flexibility along the longitudinal axis, to prevent unwanted oscillations. Every change of the angle of attack results in an torque input to the blade, if the blade is, due to its structural or material limitations not torque resistant, unwanted pitch inputs will result and the flight path will be unstable, vibrations will occur at the fuselage as well as at the engine (see Michael Kalbow, Hubschrauber Aerodynamik). Do prevent these unwanted side effects people came up with the S-type airfoil. Aerodynamically the upper airflow will hit the trailing edge of the blade which has been bent upwards, creating a turning motion to counteract the pitching motion. Needless to say this construct will increase the drag, requiring additional engine and servo power and decreasing the overall flight time. Nowadays using CFK/Keflar material and production processes quite different airfoils can be used. Our Big Scale Blades are flexible enough along the longitudinal axes to warrant stable flight conditions even if it is windy or if the helicopter got an increased fixed weight due to a fuselage or other ad on. They are very torsion resistance, no additional steering inputs to counteract torsion will be required.
The asymmetrical airfoil does have a reduced drag coefficient combined with an increased lift factor which supports the overall trend to reproduce as many details as possible in the scale area, this will, of course, increase the weight of the model. The blade itself has been designed with the center of gravity close to the tip and a small angular difference between the longitudinal axis and the rotation axis. These attributes grant smooth and stable flight characteristics during straight and level flights. The low net weight of the blade is reducing steering and mechanical forces, increasing the flight time considerably.
These blades have been developed in cooperation with the Helifactory using their helis to reach the upmost performance.
Click HERE to place your order for your Big Scale blades or please visit your favorite SpinBlades dealer.
EC145 Rega (final)
EC 145 Rega
Helifactory Cobra -SpinBlades-1050mm
The Cobra is made by Helifactory with a Jetcat turbine, the rotordisk is 2,5 m and the blades are SpinBlades 1050 Counter Clockwise extra wide core (14mm). Headspeed is 850 RPM and the weigh is approx 23 Kg.
MATT BLACK SCALE
Our logo, the three bars, was placed at the inside of the blade nearly invisible but noble, to support the scale look. These blades do have an asymmetrical airfoil and produce lift an angle of attack of 0 degree, enabling the pilot to decrease the flight rpm considerably, without losing any climb performances. The additional weight of the fuselage, lighting system and other mounting parts can be easily compensated for. These blades are available as two blades systems and in addition to as multiblades system with much smaller blade depth. The very low flow line combined with the more to the tip of the blade positioned center of gravity prove a very stable straight and level flight and optimized performance. These attributes are supporting the requirements of modern FBL Systems, for which these blades are optimized.
Click HERE to place your order for your Matt Black Scale blades or please visit your favorite SpinBlades dealer.
Pöting Turbinen-Heli Meeting 2012
EC 145 T2 in Action. Starker, bockiger Wind bis Windstärke 6, aber Bernd Pöting nimmt’s gelassen – Typ “Cooler Hund” eben. 😉
Heli-Factory Lama with SpinBlades 1050 3B matt black scale
Here you see a Lama build by http://www.helifactory.com/ with SpinBlades 1050 3 B matt black scale (CFK/ Kevlar 3Bladessystem). The Lama has a 2,5m Rotordisk and weights approx. 25 kg. As a Transmitter we use Graupner Hott.