I think this is the best explanation I have seen. Having some actual blades that you move gives a far better idea of what is going on then just explanations and drawings.
I love the design always have… So for that reason I've always flown radio controlled helicopters at the moment but the newest one is fully articulated. Most are. But the people that came together to invent all of these things made something really remarkable
V.N. jan.70 we had the experimental huey C mod.come in from Bell at the605th. With Bell engineers.dual hyd.H.D.cobra head,masive rotors and canted tail boom.Flight tested it in country.
Any video on blade &head balance initial & dynamic on rotarway & mosquito.don't know what heli I will end up with.very good explanation on main head system.i'm just beginning on full size heli. Thanks R.M.
Have I understood correctly that the blade angle is the only thing controlled by the pilot and all the other movements is due aerodynamic forces and centrifugal force on the blades?
You are correct. Collective force changes the blade angle on all blades equally. The cyclic changes the angle of the blade at different points in order to get the blade to fly higher or lower depending on how the rotor disk is required to tilt.
so if you are hovering the blades should go to the max flappening position?? or they are in a medium position due to centrif forces evey with load@@MrSkidkicker
Very interesting and nice to see! Maybe you can show us the semi-rigid rotor system under the aspect of mast bumping, can‘t find a video so far where it actually shows real footage. Please continue your work man, like and subscribe :)
Thanks for the comment, sounds as though you have a good grasp of the basics. The biggest problem is the reaction to the aircraft getting light, in a low g condition, the tail rotor causes the fuselage to roll to the right while the rotor (big gyro) maintains its plane of rotation. The pilot tries to correct for the roll, tilts the disk in the opposite direction and BANG, mast bumping. Thanks for the advice, I will try and get a video on it up soon. Skids
I have a question,. In the fully articulated rotor system, if the blade is free to flap on it's own, and it shoud never bump the mast, how is it possibile for the wing to transfer the lift to the helicopter?
Ive been trying to understand your question. with all blades spinning at 100% centrifugal force is effectively strengthening the blades and producing lift. flapping individually causes the system to speed up due to Coriolis force(semirigid underslung teatering - flap while tethered together 180º apart. CG is in the same spot during rotation therefore it does not speed up) . lead and lag counter Coriolis force by allowing the individual blade to speed up from flapping momentarily but is suppressed by the dampers. thus removing stress from the blades and rotor hub. flapping and lead/lag help the aircraft to make the uneven lift,,, distribute more evenly throughout the plane of rotation.
@@tuckerzehner7970 thanks for the answer my question was simply how a non isostatic body can transfer lift to the mast. I now understand that it's the centrifugal force itself that makes it possible.
Is there a "simplified" rotor head which can be used for a three-blade rotor system ? Something analogous to the Bensen 'type' teeter bar (?), since I would like to find out the difference in performance, such as lift and autorotation cabalities with three blades as opposed to two blades. Any thoughts shall be appreciated.
Probably not - it's just cheaper and still effective to teeter. Separate flap hinges per blade are used because teetering doesn't work with more than two blades.
Yes, because of its in plane stiffness, by definition, the star rotor head you are referring to can be considered to be semi ridged, but has the motions of a fully articulated rotor.
@@MrSkidkickerThe astar isn't semi rigid is it? I always thought semi rigid referred exclusively to a teetering hinge rotor system. It's a rigid rotor system no? Specifically a hingeless, bearingless rigid rotor system?
No, there is no coupling between the flapping and pitch change in the main rotor of the AS350. This is common on a variety of different tail rotors (except the AS350 tail rotor :)) and rare on most main rotors.
At present, I do not know a lot about airplanes by myself. I have a question to ask you whether the blades of NACA8H12 rotorcraft can be used in helicopters.
Two blades are semi-rigid the Blade make the action lead and lag however the Main rotor Head and blades hás the time reduced per half life of hours incomparassion with articulate, the articulate Main Head is more quality and Fine now do exist the rigid sistem aplicable in Messershimmit BO 105/ Bk 117 are Acrobátics and main rotor Head makes in Titanium and only hás movement of Piching and hás one vibration 1/1 ever.
Just a suggestion … we don’t actually need to see you. For technical videos like this one what is more important is the visualization and explanation. I could see you’re straining holding the camera, showing yourself and showing what you need to explain.
@@MrSkidkicker you are photogenic… 😉 at least certainly more photogenic than me 🙂 the thing is the camera just isn’t wide angle enough to put you and what you need to show on the same scene doing what amounts as a “selfie angle” 🙂 i mean no harm … my input is just to make easier for you 🙂✌️
I agree. I think a good solution is to keep the selfie angle while you're explaining stuff but switch to another camera angle for the actual demonstration. Video instrustry calls this alternative camera angle as B roll for historical reasons, if I've understood correctly. However, this obviously requires video editing or use of two cameras with easy to switch camera input on the fly setup.
@@MikkoRantalainen Thanks for the tips Mikko. I will be remaking the video soon. This was my first attempt at filming and my amateur film making experience shines through :)
Just found this video. So....why do all modern gyrocopters use only a 2 blade, large diameter flappy rotor? I would think a smaller diameter 3 blade rotor would be less drag, less stick shake, and less retreating blade factor. I think autogyros are great except for how slow they are. If you really want to GO SOMEWHERE, rather than just fly around at 70kts, you need a machine that can cruise at....maybe 120kts. Why so slow. Do you know?
Gyrocopters are as cheap as possible, so they usually have simple two-blade teetering rotors; some even tilt the rotor rather than using cyclic pitch control.