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Old 05-05-2011, 06:55 PM   #29
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Originally Posted by AZCamaroFan View Post
This really sucks, because the parts that are left are in the hands of Pakistan, and could be sent to the Chinese. If our leaders had any brains they'd demand the parts back or the Pakistani's get no more aid.
If the whole thing was blown up as has been reported, how would anyone know which parts, if any, to demand from Pakistan?
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Old 05-05-2011, 07:37 PM   #30
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One thing is for sure, our armed forces (or certain groups within rather) have a hell of a lot of weapons tech that we've never seen before. I'm not saying there's some big conspiracy with plasma rifles or any stupid crap like that, but think about the fact that the f-22 came out in what, 1997? In 1997 I was on a Mac with half the computing capacity of my current cell phone.
The F22 program is way older than that (or newer ... depending on how you look at it). It began in the mid 80's, prototypes were flying in the early 90's, and it finally went into service a few years ago (2005ish). Originally, they were probably planning on having its replacement ready to go by now.
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Old 05-05-2011, 07:43 PM   #31
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What some may not realize is the H-60 has a constant rotor speed. it doesn't spin faster to accelerate or slower to decelerate. Now under heavy load the rotors do slow down but due to the load not due to any direct input from the pilot. The invers is also true, under light load the rotor will spin a little faster but that's still a function of decreased load to the rotor head.

So, it's all based on the angle of attack of the blades and the rotor head which on an H-60 is a fully articulated rotor head...

the rotor head can pivot in all directions and the blades twist on their longitudinal axis...

this combined with the angle of the helo results in accelleration or deceleration,

The angle of the blades will result in Climb or decent.

but the pilots are trained to know what angles are quieter than others to help with the element of surprise....

edit: Note in the two pics below the rotor RPMs are nearly identical.

this image is a helo accellerating forward and climbing... This pic gets my blood pumping..



This one is of decelerating and decending into a hover.


Pshhhh.... you act like you have been around a few helo's in your day or something



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Old 05-05-2011, 08:34 PM   #32
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Pshhhh.... you act like you have been around a few helo's in your day or something



shit dude, I found that crap on google.

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Old 05-05-2011, 09:31 PM   #33
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Wait. Didn't that Pakinstani guy twitter about all the noise the choppers made the whole time they were there?
I was just fixing to say the same thing.
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Old 05-05-2011, 09:37 PM   #34
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Originally Posted by AZCamaroFan View Post
This really sucks, because the parts that are left are in the hands of Pakistan, and could be sent to the Chinese. If our leaders had any brains they'd demand the parts back or the Pakistani's get no more aid.
Wait wait wait! You mean the U.S. Actually uses something that's not made in china?
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Old 05-05-2011, 09:38 PM   #35
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Looks a little like Airwolf. Remember that show?

Somewhat similar I guess.


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Old 05-05-2011, 10:33 PM   #36
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shit dude, I found that crap on google.

Gotta love google.....


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Old 05-05-2011, 10:39 PM   #37
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Originally Posted by RSokie View Post
Somewhat similar I guess.


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Old 05-05-2011, 10:51 PM   #38
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Chris...is there any particular reason the Black Hawk has constant rotor speed versus the other option?

Engine efficiency, size of the aircraft?

That's pretty cool, I never knew that!
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Old 05-05-2011, 11:38 PM   #39
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I demand you close and delete this thread at once! You are releasing classified information!
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Old 05-06-2011, 12:03 AM   #40
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Old 05-06-2011, 02:43 AM   #41
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Originally Posted by DGthe3 View Post
The F22 program is way older than that (or newer ... depending on how you look at it). It began in the mid 80's, prototypes were flying in the early 90's, and it finally went into service a few years ago (2005ish). Originally, they were probably planning on having its replacement ready to go by now.
I thought it was called the YF22/YF23 until the actual LM f22 raptor in 1997.
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Old 05-06-2011, 07:48 AM   #42
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Chris...is there any particular reason the Black Hawk has constant rotor speed versus the other option?

Engine efficiency, size of the aircraft?

That's pretty cool, I never knew that!
Here's a common sense answer.... cus I don't truly know..

But I'm guessing that it has to do with the "direct drive" transmission.

the jet engines that power the the main transmission that turns both the main rotor and the tail rotor are directly connected to the an ouput shaft from the two engines...

My guess is it's that it's more efficient/effective to have the transmission spin at a constant speed, while allowing the engines to respond to the increased or decreased loads caused by the angle of attack of the blades and rotor head... or the work the rotor head is doing...

But to be clear. the engines do spin up under increased load. but the rotor head rpm is relatively constant.

In fact there is a Main Rotor Overspeed indicator that when lit basicaly means that Aircraft is down for maintenance until the rotor can be inspected/serviced...

FWIW.
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