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Tilt Rotor Aircraft

Posted February 10, 2015 12:39 PM by CR4 Guest Author

The tilt rotor aircraft is one of the most versatile vehicles in terms of application and usability. It is an aircraft that can take off just like a helicopter and can easily cruise forward at high speeds like an airplane. It's a modern day aircraft with adjustable rotors.

The tilt rotor aircraft was developed out of necessity. While helicopters can be useful, they do have some disadvantages:

  • Forward speed is determined by the speed at which the horizontally-mounted rotor turns
  • Increasing the speed leads to a high probability that the aircraft can lose its balance
  • 277km/hr is the approximate maximum speed
  • Maximum altitude is about 10,000 feet

A tilt rotor aircraft has the following advantages:

  • Adjustable rotors can tilt vertically
  • A maximum cruise speed of 560km/hr can be achieved
  • Maximum altitude is about 20,000 feet

image - wikipedia

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#1

Re: Tilt Rotor Aircraft

02/10/2015 2:58 PM

...but, WHEN are we gonna dump the spinning propellors and fly soley on jet exhaust?

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#2
In reply to #1

Re: Tilt Rotor Aircraft

02/10/2015 4:12 PM

There is this family of planes.

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#3
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Re: Tilt Rotor Aircraft

02/10/2015 4:46 PM

My first job as a Co-op 30 years ago was working on a series of 8 maintenance trainers for the AV-8B Harrier for the US Marines.

Quite an interesting aircraft....and loud too!!

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#6
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Re: Tilt Rotor Aircraft

02/10/2015 10:52 PM

Loud doesn't even approach the reality of that beast. And they seemed to like to fly them out of Bagram around 0200 when I was trying to sleep in a tent about a half mile away.

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#13
In reply to #2

Re: Tilt Rotor Aircraft

02/11/2015 12:19 PM

The aircraft that came into service a few years after I did, and only fairly recently retired. Politics again!!

A wonderful design of aircraft....and very advanced for its time.........

The US marines are probably still using them (as far as I know?)

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#4

Re: Tilt Rotor Aircraft

02/10/2015 4:56 PM

Makes me wonder how much flight time you can get out of the wing structure.

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#5

Re: Tilt Rotor Aircraft

02/10/2015 10:38 PM

That's about the shallowest comparison I've ever read. Not to mention it appears to be heavily partisan in favor of tilt rotors. The disadvantages of more traditional helicopters needs to be revisited. For example, the rotor speed does not determine the forward speed. Most military use helicopters fly and hover with a constant rotor speed.

Secondly, the quoted max altitude of 10,000 feet is just wrong depending on the type of helicopter. My beloved Chinook, F model, has a service ceiling of 20,000 feet.

Lastly,tilt rotors have a severe disadvantage when attempting a troop insertion in a hot LZ. A UH-60 and UH-1 can approach at high speed, flare, rotate to forward pitch angle and exit the LZ while discharging troops out the sides, sometimes without even touching the ground (depending on the skill of the pilot).

The Osprey requires a full stop to discharge troops out a narrow right side door or the aft cargo ramp. More than one Osprey has crashed during training flights by the pilots flying through the power curve into the ground while simulating approaches into hot LZ's. Tilt rotors are much more vulnerable in this role.

Range and top speed are the obvious advantages of tilt rotor aircraft, but one needs to use the right tool for the job.

Hooker

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#7
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Re: Tilt Rotor Aircraft

02/11/2015 7:44 AM

Thanks for the additional information!

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#8
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Re: Tilt Rotor Aircraft

02/11/2015 8:32 AM

There's a tool for every job.

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#10
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Re: Tilt Rotor Aircraft

02/11/2015 9:12 AM

Amen! We depended on SH3-A's to keep overboard watch over the four quadrants of the carrier, active and passive sonar and 300# depth charges if necessary, day or night, rain or shine for hours, at altitude's that give little time to react. We and one casualty in the four years, due to an ASE (automatic stabilization equipment) malfunction, but the crew made it out thanks to another SH3.

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#17
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Re: Tilt Rotor Aircraft

04/16/2015 1:07 PM

Also your antique Sh-t hook is faster and more dependable than almost all of the new choppers designed and as you say the UH-1 can come in hot, flare, and unload almost in no time and the troops learn very fast that they can survive a few extra feet of dropping out of the chopper to get to the ground faster. There are a few military craft that when they built them they "Got it Right the First Time". The A1-Sky raider, the Huey Cobra, the B-52, and the venerable Chinook are just a few that if they built them new today they would still be workhorses. Just think what they could do if they used today's technology to upgrade them now.

Rich Hurd

RVN 1970-1971

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#9

Re: Tilt Rotor Aircraft

02/11/2015 9:00 AM

Ospreys are a tool for a job. But the Marines adaptation of the Lockheed Martin F-22 is totally awesome:

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#11
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Re: Tilt Rotor Aircraft

02/11/2015 9:39 AM

That's the F-35, not the F-22.

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#12

Re: Tilt Rotor Aircraft

02/11/2015 11:45 AM

You are correct obviously, my bad, the Raptor is cool too but a different tool for a different job with no vertical takeoff or landing.

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#14

Re: Tilt Rotor Aircraft

02/21/2015 9:46 AM

There was another way 60 years ago - the Fairey Rotodyne. It was a noisy beast. I lived about 7 miles away from the Fairey Aviation airfield at White Waltham as a schoolboy and frequently heard it taking off and landing - it sounded like a giant steam train approaching when the rotor tip pressure jets were ignited. Even in the 1950's it could fly at around 200 mph with up to 65 passengers.

https://www.youtube.com/watch?v=y9633v6U0wo

https://www.youtube.com/watch?v=SJqcVVnk3DM

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#15
In reply to #14

Re: Tilt Rotor Aircraft

02/21/2015 2:23 PM

Impressive, the first video shows a landing in a twenty knot wind. The only drawback, based on the videos is area required on ground. What happened to this design?

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#16
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Re: Tilt Rotor Aircraft

02/21/2015 3:08 PM

You can look it up on Wikipedia, but basically, no military orders were forthcoming with which to finance further development and no orders from British European Airways (B.E.A.), so it got cancelled. They were getting the noise problem solved, but it wasn't to be. The usual vacillation, politics, lack of money, lack of orders, fear of something new ....... etc. Terrible shame.

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