eurocopter x3

[cacciatorino]

leggevo su www.md80.it of this eurocopter x3, a prototype of "hybrid" helicopter, in fact uses the main rotor to support itself, but the propulsion is entrusted to two smaller propellers mounted to the esthetivity of small wings.

Here.
http://www.eurocopter.com/site/en/ref/videos_1101.html#.tdtrmlu9ghmA video of the prototype.

notice the absence of the rotor of what, it is seen that they balance it with the two lateral propellers.

 

[CIARLY]

leggevo su www.md80.it of this eurocopter x3, a prototype of "hybrid" helicopter, in fact uses the main rotor to support itself, but the propulsion is entrusted to two smaller propellers mounted to the esthetivity of small wings.

notice the absence of the rotor of what, it is seen that they balance it with the two lateral propellers.

very interesting solution, I think much better than convertiplano.
the mechanics of the main rotor will be discharged from a little work.

 

[Tequila]

I assume they use "in part" the vehicle's flight system. in the takeoff I see that it works as a normal helicopter (vertical salitates) but then in flight the main rotor acts as a wing that creates portanza held in rotation from the air flow that invests the blades during the advancement

 

[RS4]

Meet the direct demonstrator competitor is called sikorsky x2 should reach a speed of 482km/h

to be noticed the double rotor and the tail plane and the vertical reversed with the turbo propeller engine in the tail

It seems to you
http://www.sikorsky.com/innovation/vision+of+the+future/technologies/x2+technology

 

[CIARLY]

I assume they use "in part" the vehicle's flight system. in the takeoff I see that it works as a normal helicopter (vertical salitates) but then in flight the main rotor acts as a wing that creates portanza held in rotation from the air flow that invests the blades during the advancement

I think it's a "normal" helicopter only changes that the engine's countercouple is kept by acting on the two side rotors step, which also serves for the push in flight.
as mentioned above seems to me a great solution and must fly even very well because removing traction from the main rotor should make you fly much more slowly and less beaten.

 

[Tequila]

Meet the direct demonstrator competitor is called sikorsky x2 should reach a speed of 482km/h

to be noticed the double rotor and the tail plane and the vertical reversed with the turbo propeller engine in the tail

It seems to you
http://www.sikorsky.com/innovation/vision+of+the+future/technologies/x2+technology

nice toy so wide with the double counter-rotating rotor avoid to mount the tail rotor to compensate for the rotation torque. in theory with this system and the further back thrust should be able to overcome the max speed limit that the helicopters have.

Do you have any more info about this?

 

[Tequila]

I think it's a "normal" helicopter only changes that the engine's countercouple is kept by acting on the two side rotors step, which also serves for the push in flight.
as mentioned above seems to me a great solution and must fly even very well because removing traction from the main rotor should make you fly much more slowly and less beaten.

the technical solutions that they adopted I wouldn't comment on them because I didn't see them but it seems strange to have 2 thrust engines mounted instead of leaving the tail rotor. rather I would be more convinced that in flight let the blades turn for autorotation.
Keep in mind that they would have 3 engines to feed and if the speed increase does not justify consumption for me does not have future, rather it is better to stay on the convertiplano.

I feel better the solution of the x2 sikorsky that has everything in line with the fuselage so the resistance is quite reduced and the counterrotating pair is balanced by the 2 rotors.

if the problem is to avoid mounting the tail rotor could adopt the "notar" solution even if the engine power would be lost for this operation and at high speed its operation decays.

 

[RS4]

nice toy so wide with the double counter-rotating rotor avoid to mount the tail rotor to compensate for the rotation torque. in theory with this system and the further back thrust should be able to overcome the max speed limit that the helicopters have.

Do you have any more info about this?

power of the aerodynamics - the x2 is designed to demonstrate to the world of the aeronautics that, with the right technology (a motor with two twin rotors) and careful aerodynamic studies, modern helicopters can double the speed of cruise. Of course, sikorsky managers do not fail to emphasize how fast devices open new possibilities for use as means of transport instead of the most expensive mini-jets or as rescue helicopters.

next challenge - X2 engineers, immediately after the test flight, stated that the test went beyond their expectations and that the next challenge (by the end of 2010) will be to reach the speed of 288 miles an hour, equal to 463 km/h... more than a helicopter, is a real formula 1.

a few months ago we told you about the project x2 demonstrator, a two-rotor coaxial helicopter that the sikorsky was testing to take him to beat the speed record for helicopters. generally, a conventional helicopter (i.e. with rotors mounted each on its axis) can reach a maximum speed around 170 knots, and already during the test phase, the x2 model had reached a peak speed of 181 knots.

a few days ago, the sikorsky x2, during an unofficial test flight, recorded a speed well higher, reaching the 250 knots, largely above the official record of about 216 knots, established by the British helicopter westland lynx in 1986.

the limit of 250 knots was the initial goal of the x2 project, and the sikorsky intends to use the technology of the x2, and the experiences accumulated during its design, to build double-helical coaxial helicopters ever faster, obviously with an eye to stability and simplicity of use.
In fact, the x2 prototype used for these tests shows that a helicopter can reach very high speeds, without losing anything from the point of view of maneuverability at both high and low speeds, and stability when it stops at half air or during the acceleration phase.

Now, the challenge is to produce series helicopters that maintain these characteristics, and to integrate them and improve them by adding the technology that customers will require, from armaments to video equipment for reconnaissance and aerial surveillance at high speed and flexibility.

Once this integration is carried out, the future of helicopters could be rewritten... at high speed!

 

[CIARLY]

the technical solutions that they adopted I wouldn't comment on them because I didn't see them but it seems strange to have 2 thrust engines mounted instead of leaving the tail rotor. rather I would be more convinced that in flight let the blades turn for autorotation.
Keep in mind that they would have 3 engines to feed and if the speed increase does not justify consumption for me does not have future, rather it is better to stay on the convertiplano.

I feel better the solution of the x2 sikorsky that has everything in line with the fuselage so the resistance is quite reduced and the counterrotating pair is balanced by the 2 rotors.

if the problem is to avoid mounting the tail rotor could adopt the "notar" solution even if the engine power would be lost for this operation and at high speed its operation decays.

Your answer put the flea in my ear, I went to the site reported above by hunter and here I found this
(the x3 hybrid is a modified dauphin with the installation of two court wings, on which are installed propellers operated by the same turbulbs that turn the rotor. from this Eurocopter configuration is expected to match the speed of the turboprop aircraft with the stationary flight capabilities of the helicopter. This is, in practice, the same objectives persecuted by converts, whose costs are usually considered greater. According to a.d. lutz bertling the Eurocopter solution will instead offer “about 50% more speed of cruise and autonomy at very low costs, thus defining the future of high productivity rotating wing aircraft. »

In practice it seems to me to understand that the two lateral propellers are dragged by a tree that comes from the main reducer what drags the main rotor, so constant turns like a helicopter on the tail rotor, and you vary the step.
the solution however according to me and simpler to have a double counter-rotating main rotor, and simplifies the management of the main rotor because' removing "in part" the traction from this you go to download it of a part of work.
the fact of having everything connected allows you to make autorotations quietly, although here many adore.
I was flying with an ultralight a little while ago, the first thing was to think what to do if it was planting your engine, and some manias then you're left.
That's why I don't like convertiplano because things have to be a lot more complex.
and since the things that are not there do not break, the less you put and the less problems there are.

 

[Oldwarper]

It's a helicopter that at high speeds becomes more and more self-winding, decreasing power and changing the inclination of the blades.

 

[CIARLY]

It's a helicopter that at high speeds becomes more and more self-winding, decreasing power and changing the inclination of the blades.

but according to me helicopter and autogiro are two very different things, you can take a helicopter and add a propeller of push or two, but it will always be a helicopter " able to do overing and to rise from the ground" an autogiro can never become a helicopter in fact the rotor and only dragged when it goes on and can never pull off from the ground and be overing.
In fact, with the first people, they also made holes on the ground because they thought they had a helicopter.

 

[Oldwarper]

but according to me helicopter and autogiro are two very different things, you can take a helicopter and add a propeller of push or two, but it will always be a helicopter " able to do overing and to rise from the ground" an autogiro can never become a helicopter in fact the rotor and only dragged when it goes on and can never pull off from the ground and be overing.
In fact, with the first people, they also made holes on the ground because they thought they had a helicopter.

if we call it a ride or elicoplano va meglio?:finger::wink:

 

[Tequila]

but according to me helicopter and autogiro are two very different things, you can take a helicopter and add a propeller of push or two, but it will always be a helicopter " able to do overing and to rise from the ground" an autogiro can never become a helicopter in fact the rotor and only dragged when it goes on and can never pull off from the ground and be overing.
In fact, with the first people, they also made holes on the ground because they thought they had a helicopter.

I agree with what oldwarper said and that's what I mentioned in the third post.quote : I assume they use "in part" the vehicle's flight system. in the takeoff I see that it works as a normal helicopter (vertical salitates) but then in flight the main rotor acts as a wing that creates portanza held in rotation from the air flow that invests the blades during the advancementother thing (becoming from the world of ultralights), the autogiro is not that they have completely the free main rotor, they have practically an articulated transmission that grafts and disconnects manually, that takes the bike from the drive motor to bring to regime take off the rotor blades otherwise it would take a very long track before taking them in autorotation with the only air flow that hits against.

then once reached the necessary turns disconnect the transmission and take off.

 

[sail]

http://en.wikipedia.org/wiki/lockheed_ah-56_cheyenneNothing back under the sun... this helicopter of mid-60s was a prototype in the tender that then won the cobra first and then the amp

went to about 212 kts, 395 km/h pushed by a back propeller in addition to the tail rotor.

a real hybrid between aircraft and helicopter, probabilmetne too advanced for its time.
http://www.youtube.com/watch?v=nk48fcwcy7q I'm... video!
http://www.helis.com/h/h56_3.jpg

wonderful, like all beautiful:smile:

 

[sail]

a little chicca for those interested. . .

the first of four parts of a documentary of history channel on the cheienne, including a discussion on the various steps that led to its realization, and then to its decline. . .
http://www.youtube.com/watch?v=d-kklhf-chc

 

[sail]

Meet the direct demonstrator competitor is called sikorsky x2 should reach a speed of 482km/h

to be noticed the double rotor and the tail plane and the vertical reversed with the turbo propeller engine in the tail

It seems to you
http://www.sikorsky.com/innovation/vision+of+the+future/technologies/x2+technology

beautiful! probably don't need wings because having double counter-rotating rotor, just solve the problem of the portance loss of the propeller that "arretra"