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Our Newspapers. Stories about people you know told by people you trust Subscribe to the news that matters to you Subscribe now. News Oct 17 SlipStream77 2, posts months. The blades can deflect quite a lot - as demonstrated here Ray Luxury-Yacht 8, posts months.
Because - on a windy day, there is a possibility that the disc can deflect downwards a very surprising amount! As has been said, this has caught out sadly deceased people in the past. Just Google round and you'll see what I mean. Also, as far as I know - if the machine is sitting with the engines a Flight Idle then the rotor speed is spinning at a decent rate which prevents some deflection of the disc; however if the machine is sitting with the engines at Ground Idle then it will also be in a low rotor speed state, which means that the disc is more likely to deflect.
This is why, when the chopper I sometimes work with starts up, our Pilot tells us to stay away from the disc until he gives us a thumbs up - when he does, we can then approach the aircraft and it is apparently when the engine is up to Flight Idle mode, and the disc is the least likely to deflect in wind. Sitting inside when the start the rotor up is interesting, as you'd think it is going to fly apart judging by the wobbling and gyrations of the body as the blade speed picks up.
But it smooths out once the blade gets past eyeballing speed. HD Adam 4, posts months. I remember when Noel Edmunds used to fly around in his helicopter when he lived in Buckinghamshire.
I often imagined him getting his head chopped off. Not Mr Blobby's though Sadly he's still annoying us. Blaster72 9, posts months. Hainey 4, posts months. As has been said, rotors are hinged, they have to be or else the whole thing wouldn't fly. The amount of deflection can catch anyone out. When you lift off and go forwards, after about 20kts you get the disk 'flapping back' which really changes the dynamics of the handling and shows how much movement there is in the whole system.
Ask the pilot to describe it as you go through it and you'll start to get an understanding of the physics of the whole system. The ducking thing is something I always brief any pax about. That and never, ever approach from the rear, always the front. Those are my two golden rules at the pre flight briefing. Kenty 4, posts months. Halmyre 9, posts months.
Siko 1, posts months. The worst time is starting or stopping the rotors in gusty winds when the blades are very prone to 'sailing'. Its amazing how much a modern composite and very thick blade can sail in gusty winds.
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