dynamic rollover helicopter

If you are looking for the best Dynamic Rollover Helicopter, then look no further than this article. It includes the dynamic rollover definition. Perhaps you are interested in helicopter ground resonance, then reading this article may help you.

Dynamic Rollover (DR) is a situation of which, hopefully, all helicopter pilots are aware. It is taught in groundschool and explained in detail during initial rotary training, and the recovery actions are often quizzed during examinations and check-rides. Despite this, we see accidents on a far too frequent basis in which Dynamic  Rollover is cited as the cause. It might be useful to look at why this apparent contradiction may exist. 

dynamic rollover definition

Dynamic Rollover Helicopter

Years of experience
After many years of instructing, I believe there are two main reasons for the prevelance of Dynamic Rollover related accidents. The first is fairly straightforward – Dynamic Rollover recovery cannot be practiced effectively in an aircraft. It can be briefed and discussed, but an instructor is very unlikely to put an aircraft into Dynamic Rollover and then hand control to a student to complete the recovery actions, at least not more than once, as the need to take immediate action to prevent a crash precludes this. This leaves a pilot in the position of never having actually practised the actions that would be required immediately and without prevarication in the event they find themselves in this situation.

However, there are many emergencies that cannot realistically be practised in an aircraft, yet Dynamic Rollover seems to be more problematic than so many other flight regimes and is an area where incorrect recovery technique is all too often mentioned in accident reports. Why might this be?

The root cause for the continuation of these accidents is that the recovery actions could be considered counter intuitive

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This information allows us to understand why our reflexive response to an undesirable roll – applying opposite cyclic – will be ineffective in the case of Dynamic Rollover. If we imagine an aircraft on a lateral slope, right skid upslope for example, we can see how Dynamic Rollover might occur.

Prior to lifting, the pilot applies right (into slope) cyclic to level the disc. Collective is then applied, and as the left (downslope) skid starts to break the ground and rise, the pilot should move the cyclic left to maintain a level disc attitude.

However, the pilot does not do so, which has the effect of the disc now starting to tilt to the right, towards the slope. Our lift vector is now trying to roll us into the hill. Crucially, the rate of roll, with the upslope skid still in contact with the ground, is controlled primarily by the collective, with its huge control power. The pilot continues to raise the lever to break free from the ground. However, as the disc is not being levelled, this has a two-fold effect, firstly the disc tilts even further towards the hill, increasing the roll tendency by directing the rotor thrust even further towards the slope, and the magnitude of this misdirected thrust is increased by the larger collective input.

As the rate of roll towards the slope becomes excessive, the pilot notices and instinctively applies left (out of slope) cyclic. The problem, as we know, is that the collective, with its huge control power, has generated this rate of roll towards the slope. The cyclic, with its comparatively weak authority, is powerless to overcome it – only the removal of the collective force has any realistic chance of preventing the aircraft from continuing into the slope, hence the correct recovery action of lowering the lever.

This, of course, brings the possibility of lowering the lever excessively, preventing the Dynamic Rollover from occurring, but then lowering the downslope skid onto the ground so rapidly that the aircraft rolls over in the other direction. 

CREDIT CAE
© Kestrel Aviation

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Maintain a level attitude
As we can see from this scenario, the pilot is having to make an unfamiliar control input, which he has likely never practised, in a very short period of time. This is clearly an extremely undesirable situation, and unfortunately the solution is as obvious as it is unhelpful – do not get into this situation in the first place.

When lifting from a slope, or frozen ground, or a surface where a wheel or skid may have become ‘caught’, remember to fly slowly and smoothly, and as the lever is raised, maintain the disc in a level attitude. If the aircraft does not react as you expect, then gently lower the lever and investigate the cause.

Remember that although there are known problem areas where Dynamic Rollover is more likely to occur, it has happened on flat airfield surfaces as a result of mishandling, so it can actually be encountered any time the aircraft is in contact with the ground.

It certainly helps to ‘armchair’ fly this recovery procedure, and the level of simulator fidelity is improving all the time to the point that those with access to such devices can now practise in a far more realistic environment. A mental note of the recovery actions should be taped to the back of the mind of every pilot and refreshed every time operations are likely to include any scenarios in which the factors that may lead to a Dynamic Rollover situation are in existence. 

helicopter ground resonance

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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