NOTAR
NOTAR (NO TAil Rotor) is the name of a helicopter system which avoids the use of a tail rotor. Developed by McDonnell Douglas Helicopter Systems (through their acquisition of Hughes Helicopters), the name is an acronym derived from the phrase no tail rotor. The system uses a fan inside the tailboom to build a high volume of low-pressure air, which exits through two slots and creates a boundary layer flow of air along the tailboom utilizing the Coandă effect. The boundary layer changes the direction of airflow around the tailboom, creating thrust opposite the motion imparted to the fuselage by the torque effect of the main rotor. Directional yaw control is gained through a vented, rotating drum at the end of the tailboom, called the direct jet thruster. Advocates of NOTAR believe the system offers quieter and safer operation.
Development
The use of directed air to provide anti-torque control had been tested as early as 1945 in the British Cierva W.9. During 1957, a Spanish prototype designed and built by Aerotecnica flew using exhaust gases from the turbine instead of a tail rotor. This model was designated as Aerotecnica AC-14. Development of the NOTAR system dates back to 1975, when engineers at Hughes Helicopters began concept development work. In December 1981, Hughes flew an OH-6A fitted with NOTAR for the first time. The OH-6A helicopter (serial number 65-12917) was supplied by the U.S. Army for Hughes to develop the NOTAR technology and was the second OH-6 built by Hughes for the U.S. Army. A more heavily modified version of the prototype demonstrator first flew in March 1986 (by which time McDonnell Douglas had acquired Hughes Helicopters). The original prototype last flew in June 1986 and is now at the U.S. Army Aviation Museum in Fort Rucker, Alabama. Soviet manufacturer Kamov made a prototype on their co-axial helicopter Ka-26 which they called Ka-26SS in 1988 it never went into production.
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by Notwehr
Talking That Shit
by: NatureI rap for all thug cliques bloods and crips
Niggas who hate the cameras and loving the chips
Caught in solitude old timers taught me how to move
Fort apache Queensbridge corner athlete
At 6-1 170 plus
Hennyed up walk around like I could never be touched
The whole clique be heavily truck
Peep the style though
Tricking house notes and whips on these foul hoes
Wild as Alpo crack crusade rap bu-ffets
A rare site like blacks in toupees
Keep the Rollie shinin' true players know the science
And those that's behind me be the Giants
While y'all are Jets
Last place niggas minor threats
Stay on the move till it's time to rest
Aint it bugged?
So take it back to the time Rickle's with Doug
I used to fiend to hear my shit in the club
Torchin it for the less fortunate y'all need to watch me
Bitches start to swarm like the paparazzi
Pussy and money it made me cocky
Celebrity getting no sleep
Drinking heavily and live the life some will never see
I got a fist full of dollars (and you talking that shit)
Rich rap scholar (and you talking that shit)
We plan to live forever (don't be talking that shit)
You better get your shit together (stop talking that shit)
It's the top of the division (still talking that shit)
Knock'em out position ('cause we talking that shit)
Anything can happen (so don't be talking that shit)
Now watch me go platinum (just for talking that shit)
1'S for the money 2's for the weed spot
Undercover cops follow me though they need not
It's like I'm Rick James
Caught in the mix rockin' thick chains
From hood to hood aint shit changed
Supplying hits
The type of cat hoes eye and dip
Tricking the same loot that some'll try and flip
Why attempt to go against the livest clique?
Firm knowing you'll burn soon as the fire's lit
And by the time it sets in I'll be a veteran
Aiming for the waistline hit you at the midsection
Trick questions for game shows
Call me arrogant too thugged out who do you blame though
Payroll the whole clique salute the rich
Moving out of the hood kids play where we used to piss
Niggaas is humorous it's Nature who this?
Claiming desperado aim shoot and they miss
But the fact is I'm giving back to the bridge
From the athletes to the hoes and blow trafficers
I'll do anything to be the man
From competing with fam
Hold guns squeeze with either hand
It's like I'm ambidexterous somehow stress this
Talking about blowing knowing the family's restless
How many ways can you correct this?
So with that I exit I guees it's up to the experts
I got a fist full of dollars (and you talking that shit)
Rich rap scholar (and you talking that shit)
We plan to live forever (don't be talking that shit)
You better get your shit together (stop talking that shit)
It's the top of the division (still talking that shit)
Knock'em out position ('cause we talking that shit)
Anything can happen (so don't be talking that shit)
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