Gave the old girl a bath today...

[RooflessVW]

Originally Posted By: Win
Originally Posted By: LoneRanger
Very cool !! But I though Simple Green wasn't recommended for aluminum?


I thought it was 409, or one of the other over the counter cleaners, that was forbidden for aluminum.


Full strength non-aircraft specific Simple Green is corrosive to aluminum, specifically in lap joints where it can be easily rinsed away.

 

[RooflessVW]

Cannot be* stupid edit clock.

 

[Kira]

That rotor head must be $250 easy!

 

[fdcg27]

Originally Posted By: SatinSilver
In before fdrqs(?) comments.

Whomever that might be

 

[jhellwig]

Originally Posted By: rooflessVW
Originally Posted By: kohnen
I'm amazed that complicated rotors like this can perform safely while spinning so quickly that centrifugal forces are desperately trying to blow them apart!

Coolness!




That is freaking awesome.

 

[CT8]

What I ponder upon is how the advancing rotors air speed is greater than its retreating air speed.

 

[JetStar]

Is that a Russian Mi-8 or a derivative?
Why the rotor head replacement? Timed out?
Thanks for sharing

 

[RooflessVW]

Originally Posted By: CT8
What I ponder upon is how the advancing rotors air speed is greater than its retreating air speed.

With forward movement of the helicopter, the blade advancing naturally has a greater relative airspeed. Against the wind, rather than with it, as on the retreating side of the rotor.

 

[RooflessVW]

Originally Posted By: JetStar
Is that a Russian Mi-8 or a derivative?
Why the rotor head replacement? Timed out?
Thanks for sharing


Kazan-made Russian Mi-8 sold for export, with the name Mi-17. The rotor head had 3 leaking feathering hinges seals and one leaking drag hinge seal, and we are unable to replace seals in the field with our current equipment.

 

[Exhaustgases]

And wow to replace that rotor head it would be cheaper to buy the machines to make the parts.

 

[Yah-Tah-Hey]

You got that right. The cyclic stresses on a rotor are enormous. Very stringent controls on manufacture and repair. I recall when I was working on my A&P that there was a little old lady working at a repair facility who used a razor blade to trim something at the blade root. Blade left a stress risers in the blade and the hub failed and was traced to her unauthorized tidying up. Wish I could remember the details but way too many brain cells have fallen prey to entropy. Seems like the helos were used in a ferry service in California. Perhaps another member remembers.