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For some reason, I thought of this stealth helicopter:

comanche.jpg

RAH-66 Commanche

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For some reason, I thought of this stealth helicopter:

comanche.jpg

RAH-66 Commanche

Ah the helicopter that never was...... I remember the old comanche games back in the 90's....

OT: I don't know if this is related to OBL's death, but the timing is good..... Oil and gas prices are plummeting today!

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And new unemployment claims are up to >470,000!! And GDP growth is down to just 2%!! Can you say double-dip?

As to the sound of a stealth chopper - it's vastly reduced from what most peopke are used to -

1) more blades turning lower RPM's gives the same thrust but keeps the blade tips subsonic.

2) the blade tips themselves are modified in shape to reduce vortex interactions. See pic at bottom, then imagine an even more aggressive version extending further towards the blade hub.

3) more/slower blades in the tail rotor as well, with a large diverter disc over its hub to up efficiency.

4) engine intake/exhaust baffles & exhaust spreaders with cold air injection into the exhaust. Think mufflers that also reduce the thermal signature. Anyone who has seen an F-117 or B-2 do a flyover at an air show knows you don't hear their engines until they're almost on top of you. Same thing.

500x_main-660x440.jpg

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Ah the helicopter that never was...... I remember the old comanche games back in the 90's....

Well, several working prototypes were built, they just never entered production. And if you read the article, some of that technology was possibly used in building the ones used in the raid.

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And new unemployment claims are up to >470,000!! And GDP growth is down to just 2%!! Can you say double-dip?

but you wont find a single American who'd trade Bin Laden being alive in that compound say for 0 increase in unemployment claims and 0% decrease in GDP.

or the economy would have been center stage even with all the bin laden news around.

As to the sound of a stealth chopper - it's vastly reduced from what most peopke are used to -

1) more blades turning lower RPM's gives the same thrust but keeps the blade tips subsonic.

2) the blade tips themselves are modified in shape to reduce vortex interactions. See pic at bottom, then imagine an even more aggressive version extending further towards the blade hub.

3) more/slower blades in the tail rotor as well, with a large diverter disc over its hub to up efficiency.

4) engine intake/exhaust baffles & exhaust spreaders with cold air injection into the exhaust. Think mufflers that also reduce the thermal signature. Anyone who has seen an F-117 or B-2 do a flyover at an air show knows you don't hear their engines until they're almost on top of you. Same thing.

500x_main-660x440.jpg

seriosuly where do you get such info? you seem to post much more informative stuff than the skin deep crap media feeds us.. not just this topic but over at Gorkha knife beheading and others..

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Education and burning curiosity my friend. I read excessively, have taught in both the medical and tech fields, and have more interests than time. Built my first multi-band short wave transceiver from scratch at 8, built a huge Tesla coil while still in elementary school, then it got really bad - 10th grade science fair project was an x-ray machine, 11th was a small accelerator and detector.

My parents went gray early :p

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Our very own Sheldon Cooper !

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I don't have Asperger's :p

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But all it takes is one person to hear said chopper and it wouldn't matter if it's on a radar or not, right ?

i bet thats actually what it sounds like....

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Talk abbottabad place to hide.

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Talk abbottabad place to hide.

:rolleyes: :laugh:

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http://www.guardian.co.uk/world/2011/may/09/osama-bin-laden-us-pakistan-deal

Osama bin Laden mission agreed in secret 10 years ago by US and Pakistan

US forces were given permission to conduct unilateral raid inside Pakistan if they knew where Bin Laden was hiding, officials say

The US and Pakistan struck a secret deal almost a decade ago permitting a US operation against Osama bin Laden on Pakistani soil similar to last week's raid that killed the al-Qaida leader, the Guardian has learned.

The deal was struck between the military leader General Pervez Musharraf and President George Bush after Bin Laden escaped US forces in the mountains of Tora Bora in late 2001, according to serving and retired Pakistani and US officials.

Under its terms, Pakistan would allow US forces to conduct a unilateral raid inside Pakistan in search of Bin Laden, his deputy, Ayman al-Zawahiri, and the al-Qaida No3. Afterwards, both sides agreed, Pakistan would vociferously protest the incursion.

"There was an agreement between Bush and Musharraf that if we knew where Osama was, we were going to come and get him," said a former senior US official with knowledge of counterterrorism operations. "The Pakistanis would put up a hue and cry, but they wouldn't stop us."

The deal puts a new complexion on the political storm triggered by Bin Laden's death in Abbottabad, 35 miles north of Islamabad, where a team of US navy Seals assaulted his safe house in the early hours of 2 May.

>

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