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In sending me this video of a
helicopter with a seemingly motionless rotor, a reader (I deleted the
E-mail and forgot who) conjectured that the camera is in sync with the
blades. It's either that or we have the first chopper ever to fly
solely by tail rotor. The problem I'm having is this. Since
the chopper is maneuvering, that means the collective is being used,
and that should change the rotor speed. Even a little change
would result in the blades being captured as moving. So wtf?
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Oh Rodger, I think it's just testing it's new anti-gravity device developed at area 51. Seriously though, even the tail rotor looks way slow.
ReplyDeleteMy guess is that its suspended under a heavy lift helo and you cant see the cable. Video version of photoshop?
ReplyDeleteTim
Let me work on this for a bit...gotta' mow yard, but I'll put on my thinkin' cap..
ReplyDeleteTurbine speed is constant. So is rotor speed. Collective is the combined attack pitch of the main rotors, set by moving the swashplate up or down.
ReplyDeleteI vote for camera in sync w/ blades. No other way it could work.
It's an easy optical illusion.
ReplyDeleteJust like a strobe light makes a spinning fan look stopped or when you think you see spinning wheels roll backwards.
If you look close you can see the blades moving slowly back and forth as the sync doesn't quite match up. The blades are definitely NOT stopped....
I won't argue the turbine point. In my Lycoming engine days most any movement of the collective required compensating throttle and tail rotor pedal action.
ReplyDelete^1, .., x> + #f1, .., n= < j1+g1, .., x+l}k @a, b| = \a, b*k %x1, .., x] = #k x1, .., k x2{(integral)n x = x(n+1) / (n+1) + C th(x) = sh(x)/oh(x) = ( e x - e -x )/( e x + e -x )....any questions?
ReplyDeleteHow many TBSP in a cup?
ReplyDeleteTBSP? Cup? I think that's kitchen, cooking stuff ain't it?...I'm not allowed access to that area of the house.
ReplyDeleteYou're all wrong. The helicopter and the cameraman are in freefall.
ReplyDeleteGrinfilledCelt
My resident expert on all things helicopter tells me:
ReplyDelete"Governors. Two turbine engines. Relatively constant rotor speed. You don't make throttle adjustments except on startup and shutdown."
End of story.