THIS is what the helicopter blade do

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THIS is what the helicopter blade do

Postby Charl » Fri Sep 25, 2020 8:10 pm

I do love a whirlybird, much fun has been poked at these ungainly birds, not least about why they should not fly.
Spare a thought for the life of the retreating rotor blade.
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Re: THIS is what the helicopter blade do

Postby chopper_nut » Fri Sep 25, 2020 8:37 pm

I prefer not to think about what goes on up there. I remember when I was instructing, we got told by someone in the know that on an R22, at flight RPM (104%) there was 4t of force on the attachment bolts, overspeed to 110% and it went up to 9t. They also said that if it got to 117%, the tail world come off. Kind of focuses the mind.
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Re: THIS is what the helicopter blade do

Postby Charl » Sat Sep 26, 2020 9:18 am

The BO105 has a clever rigid rotor head - what are those 2 round baubles that go up and down I am wondering.
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Re: THIS is what the helicopter blade do

Postby chopper_nut » Sat Sep 26, 2020 3:24 pm

The rigid head actually was trialed on the Gazelle. It was taken up on the 105 and continued on the BK117 and EC145. It's good but it shakes your teeth out of your jaw. Those baubles you see are the pendulous dampers. Supposed to take some of the vibration out of the head.
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Re: THIS is what the helicopter blade do

Postby Charl » Sat Sep 26, 2020 6:22 pm

Ah right... now I see them

Image

The hinged rotors are even more complicated, hard to believe they do what they get up to.
A better ride, you say?
What's the smoothest riding helo d'you know?
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Re: THIS is what the helicopter blade do

Postby chopper_nut » Sun Sep 27, 2020 8:23 am

Depends on how the head is constructed. The fully articulated head on the 500 is simple because it uses a strap pack instead of hinges. The 300 however has lots and lots of moving parts... Smoothest helicopter I've flown?? Uhhh I guess Reid's Squirrel ZK-HEX is or should I say was, the smoothest. The 105 I'm flying now is pretty good, still rattles through translation but in the cruise it's nice.
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Re: THIS is what the helicopter blade do

Postby Splitpin » Sun Sep 27, 2020 7:06 pm

Nick .... the Lynx has a pretty special rotor head set up, correct?
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Re: THIS is what the helicopter blade do

Postby SUBS17 » Sat Oct 24, 2020 7:03 am

Charl wrote:The BO105 has a clever rigid rotor head - what are those 2 round baubles that go up and down I am wondering.


Watch on youtube.com


https://www.youtube.com/watch?v=afajLxG0DFE&t=102s

Look at the moves at 2min. :plane:
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Re: THIS is what the helicopter blade do

Postby jpreou » Tue Oct 27, 2020 10:40 am

I love helis though I have only flown in one 8-10 times and been at the controls for maybe 40 mins.
I did once read a book called "Fatal Traps for Helicopter Pilots (or something like that) - there is certainly a lot to think about ! :)
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