Stealth Helicopter crashed in Osama's Compound?

Helicopters and tilt-rotor aircraft
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minneford

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Unread post29 May 2011, 01:28

One noticeable thing is that the Comanche helicopter has a ducted fan in the fin called a Fenestron. This Stealth Blackhawk helicopter has no ducted fan that I can see, unless the duct came off in the crash.

Some of the photos show that someone has put chains or cables on it like they were about to remove it.

I forget which helicopter was offered to the Army and Navy that had a NOTAR system.

The Huskie helicopter had no tail rotor like the Kamann K-Max Heli-logger.
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discofishing

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Unread post30 May 2011, 02:28

I forget which helicopter was offered to the Army and Navy that had a NOTAR system.



I think it was an MD 500 series aircraft similar to the AH/MH-6 Little Bird that the US Army's 160th SOAR uses. I don't think a Fenestron was used in this so-called Stealth Blackhawk, because of the fairing attached to the trail rotor system looks like it houses a normal tail rotor gearbox. I can't get any sort of information from my friends in the 160th, but my guess is that this aircraft is a highly modified H-60/S-70 airframe. If it was a completely new design, I believe something more along the lines of the RAH-66 would have been used, like the Fenestron system you mentioned.
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Unread post30 May 2011, 05:59

Perhaps the stealth aspect of the design was more along the lines of acoustics and not radar evasion. More blades in a rotor decreases noise. The problem is your normal gearing wouldn't work without changing the ratio. More blades also means more mass which relates to a hand full of variables changing how you'd control the aircraft. More mass spinning around. More lift per rpm because your wing area per blade is identical but the number of blades increases.
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minneford

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Unread post31 May 2011, 22:37

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I think a Fenestron is slightly different than a ducted fan. The Fenestron is built into the tail assembly. A ducted fan could be vectored thrust, also. Ducted fans might bounce back Radar because of their round shape if made from metal.

Big fat wide blades are in and thin ones are out

The biggest Turbofans flying have huge intake petals which is said to make them quieter.

Eurocopter of France has introduced new scimitar shaped rotor blades made from carbon fiber composite that are quieter. They make less noise.
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minneford

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Unread post16 Jul 2011, 22:26

I do not understand. The Army has a new secret version of a Pavehawk helicopter and they wont let us see a photograph.

For some reason no one wanted to destroy the tail assembly, but they destroyed a Blackhawk, so no one like the Pakistani or Chinese could look at it.

How many of these Stealth Blackhawks do have? How much longer are they going to keep these helos a secret?

Were the Boeing Chinooks also modded?
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minneford

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Unread post28 Mar 2012, 00:30

Actually, the first Notar Helicopter was the Huskie HH-43. It had no tail rotor.
Sikiosky's newest chopper is the worlds fasted and has two contra rotating blades like the Russian Alligator.
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