"John?] "
wrote in message
. net...
In article , Kevin Brooks
wrote:

"John?]
"
wrote in message
. net...
In article , David Windhorst
wrote:

John?] wrote:

much interesting info snipped



Controlled Descent ?

The next question you are probably asking yourself is: "Does the
pilot
retain control of the helicopter?" The answer is yes. The pilot
will
still have complete control of his descent and his flight controls.
The
majority of helicopters are designed with a hydraulic pump mounted
on
the main transmission.

Is this how the anti-torque rotor is driven in the event of
powerplant
failure?

Absolutely.

The tail rotor is powered by a driveshaft which receives output from
the main transmission. As long as the main rotor and main
transmission
continue to rotate, the tailrotor will do likewise.

On the UH-1 isn't part of that "driveshaft" linkage to the tail rotor
actually a titanium chain?

Brooks

Nope.

The driveshaft is an actual driveshaft which drives two gearboxes and
the tail rotor.

http://incolor.inebraska.com/iceman/data/tr1.jpg

The titanium chain you have in mind is in the tailrotor control system
as opposed to the drive system and controls the pitch of the tailrotor
blades.

http://incolor.inebraska.com/iceman/data/specs509.jpg

So the breakage of that chain renders the tail rotor of little use? Honest
question here-- I used to have a chunk of one of those chains; my brother's
crew chief braved a growing fire and ammo that had started cooking off to go
snatch the chain from their Dustoff bird after being shot down, and later
broke it up into pieces for each crewmember as a momento. I just never knew
the actual role it played in the control of the tail rotor, thinking instead
it was a drive chain.

Brooks


John