The prototype of the high-speed helicopter SB1 Defiant made the first flight

The first flight prototype demonstrator of the multipurpose high-speed helicopter SB> 1 Defiant made its first flight. The tests took place at the airfield of the American company Sikorsky, which together with Boeing creates a helicopter, in West Palm Beach (Florida), bmpd reports.

The creation of SB> 1 is carried out as a demonstrator of a promising high-speed helicopter on a competitive basis within the framework of the US Army program for the development of helicopters of a new concept to create a family of promising army vehicles aviation... The first built prototype of the SB> 1 demonstrator was shown on December 26, 2018.

According to the requirements of the US Army, the new helicopter must transport 12 fully equipped infantrymen with a cruising speed of at least 230 nodes (about 428 km / h) to a distance of at least 229 nautical miles (424 km). The program provides for the creation of five types of new helicopters or vertical take-off and landing aircraft to replace the entire fleet of US Army helicopters (OH-58, AH-64, UH-60, CH-47), starting around 2030-2035.

The SB> 1 helicopter uses Sikorsky's new main rotor system that combines coaxial counter-rotating rotors with a tail rotor driven by a rotor gearbox. This scheme was tested on the demonstrator of the 2015-ton S-5 Raider helicopter, which has been tested since May 97, with a "passport" maximum speed of 444 km / h and a cruising speed of 407 km / h.

The maximum take-off weight of the SB> 1 prototype is declared at 32000 lb (14515 kg), the capacity is up to 18 people. The helicopter is equipped with modified Honeywell T55 turboshaft engines with a take-off power of approximately 4000 hp and a cruising speed of 460 km / h.

The competitor to SB> 1 Sikorsky and Boeing in the program to replace the US Army's helicopter fleet is the V-280 Valor tiltrotor of the Bell and Lockheed Martin consortium, the prototype of which has been flight tested since December 18, 2017.

Comments

[MoJloT]

As it is not enough screws.

[northern]

Our decided not to mock the beauty of the classic scheme
Bottom line, back in 2016, the PSV based on the Mi-24 flew at a speed of 405 km / h.

[cast iron]

And you do not scoff at logic. In your photo, the maximum lightweight specially modified helicopter with ONE crew member, with the maximum forced engine, a glider with the most aerodynamics licked. If you add suspension equipment and weapons to your helicopter in your photo, add a 2nd pilot and electronic avionics equipment, and load 8 paratroopers into it, it can hardly accelerate to 350 km / h. Also note that the engine will be deformed.

[northern]

The article also discusses the first flight of the prototype with unknown engines and certainly no payload. Before you point out to someone the lack of logic, turn it on in your head.

[cast iron]

Before pointing me to the lack of logic, take the trouble to understand that the Americans rolled out a prototype of a TRANSPORT helicopter with the given performance characteristics. And your photo shows a prototype that was created with only one goal - to achieve the highest possible speed for the classic circuit. On one side of the scale, a prototype of a transport helicopter in order to achieve very high speeds with a full load, on the other side of the scale a prototype demonstrator is as light as possible, the goal of which was to achieve maximum speed WITHOUT ACCOUNTING THE LOAD.

[northern]

Do you know how a battery feels when trying to pass current through a tree?
I feel the same when talking to you. And I'm sick of it.

[cast iron]

Likewise. Throw your hats further and shout heart-rending "hurray".

[northern]

You have violent fantasies, you see something that is not really there. I understand everything, spring, you are not alone. There are specialized specialists in this field of medicine, I highly recommend contacting.

[faiver]

cool animal

[bouncyhunter]

Correct me experts: does Sikorsky have experience in building coaxial schemes comparable to Kamov?

[faiver]

no canes ..., experimentally for sure they built something, but I don’t remember the serial machines ...

[bouncyhunter]

Quote: faiver

I don’t remember serial cars ...

Here I am about the same. Hence, "experience, the son of difficult mistakes" with all the attendant ones. Well, or stealthy developments.

[KrokodilGena]

You might think Kamov came up with a coaxial system. If such a helicopter is needed, then they will do what is needed.

[bouncyhunter]

Quote: KrokodilGena

You might think Kamov came up with a coaxial system.

We will not touch on the topic of authorship of the coaxial scheme; better remember who developed this scheme and made it alive?

[KrokodilGena]

So take an interest in the history of the coaxial system and you will not know who developed it and when.

[northern]

And they do not need to compare with Kamov. In the case of Defiant, the coaxial screw is only the main screw, which simplifies its development.

[bouncyhunter]

Maybe you’re right: I’m not a helicopter pilot, therefore I ask questions in the hope of an answer from experts.

[Separ DNR]

Quote: bouncyhunter

Maybe you are right

Hello Pasha.
Everything is so. The coaxial, "proprietary Kamov" scheme, creates both the lifting and tractive forces, and with full control of their vectors. That is, the device can fly "sideways" and "backwards" and generally get up the devil.

And whether the American opponent with a pushing screw is capable of this (except for the declared speed characteristics) is not yet known ...

[bouncyhunter]

Seryoga, hello!

Quote: Separ DNR

The coaxial, "proprietary Kamov" scheme, creates both the lifting and tractive forces, and with full control of their vectors. That is, the device can fly "sideways" and "backwards" and generally get up the devil.

I am aware of this.

Quote: Separ DNR

And whether the American opponent with a pushing screw is capable of this (except for the declared speed characteristics) is not yet known

But who knows what they pile there. I suspect that for the sake of speed sacrificed maneuverability.

[northern]

Capable, but minimal.

[Topgun]

Well, the video is attached to the news - it flies in the ass and in front and the tail rotor is not cut now
how could it be otherwise? ALL helicopters can do this (whether coaxial or not), just when they talk about "pirouettes" in the sky the question of thrust-weight ratio arises ...

[Separ DNR]

Quote: Topgun

ALL helicopters can do this (whether they are coaxial or not)

This is not in dispute, but the point is that the cow (turns out) flies, but not as gracefully as a swan ...

And further :

[cast iron]

You are very strange reasoning. Why transport cow for 18 people to do aerobatics level attack helicopter Ka-52 ??????

[Separ DNR]

Quote: cast iron

You are very strange reasoning. Why transport cow for 18 people to do aerobatics level attack helicopter Ka-52 ??????

And this is actually not a cow demonstrator, but about the possibilities present / absent in the scheme chosen by the Americans.

[cast iron]

No, it’s about the fact that the Pentagon gave a SPECIFIC TTZ to a transport helicopter that does not need to perform aerobatics.

[Flyer_64]

Mi-8 is no worse. [Media = http: // https: //www.youtube.com/watch? V = HppBwmfBBPs]

[KrokodilGena]

Quote: Separ DNR

And whether the American opponent with a pushing screw is capable of this (except for the declared speed characteristics) is not yet known ...

A strange question, the coaxial system for this is done, the lifting force and control do not need a tail rotor to control the direction. There is no tail rotor in Sikorsky, but it is still driven in all directions.

[helmi8]

Quote: north

In the case of Defiant, the coaxial screw is only the main screw, which simplifies its development.

But how does it simplify? And why only the carrier? And how will the helicopter be controlled? To create a lifting force, he still needs a swash plate and hinges of the HB sleeve. And in general, all control of the helicopter (roll, dive-cabling) is carried out by the rotor. Everything is the same, only the pushing screw adds speed to it. In addition, the pushing screw has a drive from the main rotor gearbox. And this is a power take-off in one direction or another - a large dependence of flight altitude on speed.

[Flyer_64]

Since the 60s, there is experience in building coaxial experimental helicopters, and high-speed ones. All models were lightweight up to 5 tons. A new job is a step forward. On the new helicopter, a new design of HB blades was applied. The blade has increased rigidity. New design of swashplate. So far, according to the data that is published in our country and in the west, the weight of the helicopter is still overloaded, due to the powerful HB sleeve and additional propulsion. With a declared maximum weight of 14,5 tons, only 12 fighters (weight 120-150kg) fuel 2.5 tons, the rest is iron.
On the demonstration flight, it can be seen that the propulsion device is turned off, the helicopter performs hanging turns and approaches. Those. only the helicopter part is shown. It is very interesting how the engine will spin up when switching to flight mode.

[prodi]

Quote: Letun_64

. It is very interesting how the propulsion will develop during the transition to flight mode.

it will be more prosaic and more confident than on a tiltrotor

[boathouse]

Well, about the replacement of the entire park, it’s clearly got excited, but it will certainly take its niche and a rather large one.

[spirit]

I still don’t understand, the AH-64 will obviously be replaced by another machine. Well, certainly not this one or Valor.

[faiver]

and the Apache someone was going to change?

[Cowbra]

It is clear that such units have long been going to do. We will see what comes of this.
But the name they chose is idiotic. In WWII there was such a freak - Defiant fighter. without a weapon in front, the Germans adored him with all the respiratory and respiratory

[northern]

This name is already for a later generation. Defiant - a very sophisticated small and coolly armed ship from the Star Trek universe
https://ru.wikipedia.org/wiki/Дефайнт_NX-74205

[Tank jacket]

Interesting rotor design, similar to a machete.

[northern]

Do you like it that way?

[Tank jacket]

Yes, although I am tank, I like beautiful curved curved lines. After all, someone calculated this curve.

[Vadim237]

This design is needed to reduce the noise of the screws.

[Tank jacket]

Vadim thanks for the info. I try to work with my machete in the garden without too much noise.

[northern]

Not only for this, on this device the end of the blade overcomes the speed of sound

[krimchanin]

What is the specified prototype, that the tiltrotor, which is its competitor, are built according to an irrational scheme. The irrationality of the scheme lies in the absence of a rear ramp, as a result of which it is impossible to use light wheeled vehicles (cars, ATVs, ATVs), and other large-sized cargoes for transportation.
In this regard, domestic design bureaus have a head start in front of their American partners when designing high-speed helicopters of MI-8 dimension with a rear ramp.

[KrokodilGena]

Quote: Krimchanin

In this regard, domestic design bureaus have a head start in front of their American partners when designing high-speed helicopters of MI-8 dimension with a rear ramp.

The handicap is that they did not even begin to think about such machines and can observe for many years until they begin to draw.

[Lieutenant Senior]

Somehow overcomplicated. It looks dumb. I wonder why this particular helicopter fleet (OH-58, AH-64, UH-60, CH-47)?
Old Huey is not going to write off?))

[Engineer]

Something heaped up with the hub of the carrier this time. There was an interesting idea with the electric control of the swashplate as on X2. And the spacing of the rotors did more. Seen overlap is observed.

[Topgun]

there is nothing heaped up, everything is the same only there are no "caps"
and the fact that it is possible and the distance between the screws is slightly larger, well, the blades there are much longer than those of X2, in any case, everything is very compact compared to Kamov!

[Flyer_64]

Quote: Engineer

Something heaped up with the hub of the carrier this time.

That's for sure. Very weighted the sleeve, swashplate machines of a new design. increased spacing to a meter. When scrolling on a leash on the blades, flutter-type vibrations were observed, which led to a dangerous rapprochement. It seems that they decided something with the blades and at the same time increased the separation

[Chichikov]

Ours are also working on "push-pull", although for now it is the Kamov (Ka-92) and Mil (Mi-X1) projects. But the technology demonstrator, in the form of a flying laboratory of a promising high-speed helicopter (LL PSV), is already in the air. We will wait for the results.

[Alexander Petrov1]

They pulled off a high-speed scheme from ours from 60 years (the magazines Technique of Youth or Science and Life).

[bone1]

Well, if this miracle replaces the entire Yankee helicopter fleet, you can sleep peacefully For the first time, did the Americans use a coaxial circuit? Why a third screw in the ass?