Spinning
 

Do all helicopter blades spin the same way? (clockwise/anticlockwise/counterclockwise....)

In the Northern Hemisphere, right-handed figure skaters usually spin anti/counter clockwise, and lefties spin clockwise. Is this the same or reversed in the southern hemisphere?

here it is.

NO it isn't there. I tried to hijack that thread but it still didn't answer all my questions. hush up, now, tell me about chpper blades or be quiet.

i was just spinning you. made ya look

you did indeed. Now answer the damn question(s)

oh right.





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The Ch-47 Chinooks and Ch-46 sea Knights, each have two sets of rotor blades. They spin in opposite directions.
The CH-53 Sea Stallions have one set that spin clockwise looking up, or counter clockwise looking down, at them.
I think the french and Russian helicopters are opposite of the Sea Stallion.

All but one of the Kamov design bureau's helo designs feature counterrotating rotors on a coaxial shaft arrangement. See particularly the Ka-25 Hormone and Ka-32 Helix.

From the 1950s came a two-shaft machine that enjoyed some popularity in the States with intermeshing twin two-blade rotors that had to counter-rotate as their disc planes intersected, so they had to turn like eggbeater blades.

Even fixed-wing propeller aircraft only mostly turn clockwise. Griffin-engined Spitfires and the Zlin 526 Trener turn their props counterclockwise.

thanks, guys, but wtf is a counterrotating rotor? And yes, I googled it, but it just seems to be used as a stock-phrase. I wouldn't be suprised if half the authors using it have no idea what it actually means :rolleyes: :lol: Is it a rotor with a special bit of design to stop rotation of the helicopter?

But basically you're saying there's no advantage to having the blades going a particular way?

Counter rotating rotors on coaxial shafts, are two rotors spinning in the opposite direction, with one shaft inside the other.

No, there's really no advantage, I've heard of, but the blades have to be shaped for the way they spin.

cheers :)

(are they on the same shaft up from the body of the chopper, or one front one back?)

One shaft inside the other = coaxial. Two shafts, in different places = tandem.

Thanks. That wasn't what I meant (I realise it was what I asked -poorly worded question) but I think i have it sorted now.

Like a clock, innit, where there is an hours rotor and a minutes rotor and a seconds rotor. Inside of each other.

'Cept on the copters they go in different directions.

Because all copters need two rotors, because if they only have one, they spin once they get into the air, because of some sorta physics law of perservatory of motibles or something like that.

So cheap ones have the tail rotor, and the ones xoB makes have two big 'uns on either side so they can carry a lot of good guys, and these fancy-schmancy Russian ones have them on the same axis like a clock.

Except for NOTARS, which have only one rotor.