Eurocopter X-3

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linecrew
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Eurocopter X-3

#1 Post by linecrew » Tue Sep 28, 2010 12:30 pm

Pushing the helicopter concept to even faster speeds. Pretty cool!

Eurocopter press release

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bizjets101
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Re: Eurocopter X-3

#2 Post by bizjets101 » Tue Sep 28, 2010 3:28 pm

YouTube Video
F-ZXXX.jpg
F-ZXXX.jpg (56.78 KiB) Viewed 2547 times
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Props
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Re: Eurocopter X-3

#3 Post by Props » Tue Sep 28, 2010 5:38 pm

Is it me or do those engine pods look like they're bouncing around a bit!
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Posthumane
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Re: Eurocopter X-3

#4 Post by Posthumane » Wed Sep 29, 2010 10:53 am

Not the first time it was done. I remember seeing pictures of a Huey with a couple of turbojets mounted in a similar fashion to propel it forward and some small wings to provide extra lift. But there are a number of problems with these configurations. If you rely on the rotor to do any lifting at high speeds then you have to slow the rotor down a lot and/or go slow enough so that the rotor tips stay well below the speed of sound, otherwise you end up with some aerodynamic inefficiencies. The wings on this may be providing all the lift during cruise though, so that may not be an issue, in which case the rotor is providing just drag. It would be best if it could be stowed, but that adds a lot of technical challenges. Personally I like the tilt rotor concept (a la V-22) better for VTOL high speed aircraft, but that's just personal preference.
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bman84
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Re: Eurocopter X-3

#5 Post by bman84 » Thu Sep 30, 2010 8:49 am

Posthumane wrote:Personally I like the tilt rotor concept (a la V-22) better for VTOL high speed aircraft, but that's just personal preference.
+1

I wonder how they avoid a retreating blade stall with a cruise speed of 220+.
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linecrew
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Re: Eurocopter X-3

#6 Post by linecrew » Thu Sep 30, 2010 1:13 pm

Posthumane wrote:Not the first time it was done. I remember seeing pictures of a Huey with a couple of turbojets mounted in a similar fashion to propel it forward and some small wings to provide extra lift. But there are a number of problems with these configurations.
You got me curious so I went and found a pic. It was called the Bell 533 and acheived 317mph:

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mavrick
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Re: Eurocopter X-3

#7 Post by mavrick » Tue Nov 16, 2010 1:03 pm

a little bit dangerous to be around the area
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