composite helicopter rotor blade

If you are looking for the Composite Helicopter Rotor Blade guide, then you are on the right page. It contains the helicopter rotor blade manufacturing process. Suppose you want to know the helicopter blade manufacturers instead. Then this article is what you need.

For a helicopter, hovering means that it is in flight at a constant altitude, with no forward, aft, or sideways movement. In order to hover, a helicopter must be producing enough lift in its main rotor blades to equal the weight of the aircraft. The engine of the helicopter must be producing enough power to drive the main rotor, and also to drive whatever type of anti-torque system is being used. The ability of a helicopter to hover is affected by many things, including whether or not it is in ground effect, the density altitude of the air, the available power from the engine, and how heavily loaded it is.

Composite Helicopter Rotor Blade

helicopter rotor blade manufacturing process

[0001]The present invention relates generally to the field of aircraft rotors, and in particular to a rotor blade design for use in a helicopter or similar aircraft.

[0002]Helicopters generally incorporate at least two rotors into their design. The large rotor providing thrust in the vertical direction is known as the main rotor. In addition to this main rotor, the traditional helicopter design incorporates a tail rotor system to counteract the torque from the main rotor system. Although operable helicopter designs have been produced without the traditional tail rotor geometry, the vast majority of helicopters use this design. The number of blades in the tail rotor itself will depend on the requirements of a particular application.

[0003]In certain tail rotor designs, the thrust developed by the tail rotor is a function of the pitch of the rotor blades. Accordingly, many such designs incorporate variable-pitch rotors so as to adjust the tail rotor thrust in flight. Most such designs have traditionally employed some form of bushings or bearings about which each of the rotor blades pivots. Typical examples of such bearings include elastomeric, PTFE-lined, and grease-lubricated bearings. Generally such designs incorporate a separate tail rotor blade and tail rotor hub.

[0004]Because of the loading on those bearings and because of the type of materials used in their construction, there can be a considerable degree of static friction, or “stiction” associated with such bearings. This stiction can make fine control of the rotor pitch difficult or impossible in many situations, as the pilot must place considerable force on the pitch controls in order to overcome the static friction. This degree of force will often cause overshoot of the desired blade pitch, so that additional adjustment is required.

[0005]As the tail rotor is designed to counteract the induced torque of the main rotor, the pitch of the tail rotor blades must be adjusted whenever the torque on the main rotor is adjusted, in order to ensure that the aircraft remains “trimmed”. The repeated adjustment and readjustment of the blade pitch induces undesirable “pilot induced oscillations”, or “PIOs.” These oscillations are known to compromise the integrity of the aircraft’s flight, and may result in potentially hazardous situations.

[0006]Additionally, there are a number of failure modes associated with the use of traditional tail rotor bearings. It has been found that a failure in the primary load path, in which the centrifugal force acts, can cause a catastrophic failure of one or more components in the tail rotor, including bearings, bearing support structures, or the rotor yoke itself. It has also been found that such catastrophic failure can occur without any warning to the pilot during flight, and that such failure can occur without any discernable sign of impending failure, such as could be discovered by close inspection. Additionally, it has been found that the reasonable life expectancy of the tail rotor bearings is generally between 200 to 1,ooh hours, such that these components represent a considerable maintenance burden.

[0007]WO 98/30448 A describes a rotor for rotary wing aircraft having a tip to tip flex-beam spar and torsionally stiff hollow blades bonded to the spar throughout the tip-most portion of the blades. The spar spaced-apart spar caps which have a dual beam cross section in the region not bonded to the blades so that the spar is twistable for pitch control. The rotor spindle and controls pass through a central hole between the spar caps. An intermediate section of the rotor has shear webs bonded above and below spaced-apart spar caps, providing a stiff box beam cross section. The spar caps join each other outboard of the intermediate section. The collective control for pitch change employs a coil spring mounted between a pitch horn and a hub.

helicopter blade manufacturers

Top 10 Luxury Helicopters in the World

Most people have heard of personal and charter jets, but luxury helicopters are the genuine gems. Not only are these aircraft comparatively less expensive, but helicopters can approach places that bulky jets can’t. Having a private or commercial helicopter is expedient, more environment friendly, and a symbol of status. Celebrities including Brad Pitt and Angelina Jolie and Donald Trump own a luxury helicopter, and this slot market has grown considerably in recent years due to demand from the rich.

They are well-appointed with all the newest technology, and interior seating marks that are designed in fine Italian leather upholstery.

Therefore the list of top 10 luxury helicopters is given below:

1. Augusta Westland AW119 Ke Koala:

luxury helicopters

The Koala is chiefly used by law enforcement, but it can easily provide accommodation to a group of corporate directors traveling on business. It has a VIP services quite adequately, with premium leather upholstery and seating for about 6 passengers and 2 operators. The Koala reaches a top speed of 166 mph (267 km/h) and a range of 618 miles (995 km). Price ranges from $1.8 to $3 million.

2. Eurocopter Hermès EC 135:

luxury helicopters

Though this brand of luxury helicopters is not suitable for long distant trips, is has a class apart built. The typical EC 135 will cost you a mere $4.2 million, but the one with the interior design from the best in class designer will cost you up to $6 million. The top speed is 178 mph, but the range is just 395 miles.

3. Augusta Westland AW109 Grand Versace VIP:

luxury helicopters

Augusta Westland teamed up with the Italian fashion house Versace to produce a super luxury interior for this fancier version of the AW109. The top speed is about 177 mph and a range of 599 miles. The mere difference is that all 599 of those miles will be more luxurious for the VIP passengers. Hence, will cost you $6.3 million price tag and the helicopter is fully covered in Versace leather, design and exterior.

4. Eurocopter Mercedes-Benz EC 145:

luxury helicopters

If you’re a Mercedes fan, now you can fly your preferred brand helicopter too. A regular EC 145 costs about $5.5 million, so the Mercedes version is going to cost anywhere around $7 million. But it’s totally worth it. No other Mercedes can go 153 mph while flying 17,000 feet above the ground. It has all the luxury of the famous German sports.

5. Eurocopter EC 175:

luxury helicopters

The EC 175 made its wonderful first appearance at the Paris Air Show in 2009. The chief feature of the EC 175 is that it can hold 16 passengers contentedly inside. The top speed reaches 178 mph (286 km/h), with a range of 345 miles (555 km). It costs whooping $7.9 million.

6. Eurocopter EC 155:

luxury helicopters

This is a luxurious chopper. Its top speed is an impressive 200 mph with a range of 533 miles. It can seat as many as 13 passengers; this spacious EC 155 aircraft will cost you $10 million.

7. Sikorsky S-76C:

luxury helicopters

The Sikorsky S-76C is more generally known as Black Hawk. The massive interior is large sufficient to fit up to a dozen passengers, but the seating occupies 4 passengers in Black Hawk model. It reaches a top speed of 178 mph (286 km/h) and has a range of 473 miles (761 km). It would cost you a $12.95 million.

8. Augusta Westland AW139:

luxury helicopters

The AW139 is appropriate for law enforcement, armed patrol and firefighters. It has a capacity to seat 8 passengers. The AW139 can reach an unbelievable top speed of 193 mph (310 km/h), with a range of 573 miles (922 km). It carries a beautiful interior costing you a hefty $14.5 million.

9. Bell 525 Relentless:

luxury helicopters

Like the Gulfstream 650 jet, the Bell 525 Relentless helicopter isn’t on the market currently. This chopper is going to cost $15 million. They predicted that the seating will be for 16, a top speed of 162 mph, and a range of 460 miles. This bright yellow Relentless with amazing seating will cost you a fortune.

10. Sikorsky S-92 VIP Configuration:

luxury helicopters

The S-92 can safely accommodate 9 passengers in its extensive interior cabin. The prices vary exponentially if you plan on decking the interiors with gold or crystal. The top speed of the S-92 is around 194 mph (312 km/h), with a range of 594 miles (956 km). The prices range from $17 million to $32 million.
Helicopter charter can be the most stress-free travel familiarity you will ever have. Which includes being able to travel outside of airports to reach vital meetings or even other flights in a different airport. Though rich class can afford these luxury helicopters, they are worth the investment.

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