Beautiful, the video is perfect on the technical side, editing and graphics…excellent 👏👏👏

@flyhighytb

4 ай бұрын

Thank you very much! 😃

Great video about how a helicopter actually works. As a former private pilot, I could never understand them. As for lift, I would have to say: Newton. An airplane with flat wings will fly good enough without a rounded upper surface. Maybe Bernoulli helps, but it is the angle of attack (I think you used the “pitch angle”) that causes lift.

@flyhighytb

Жыл бұрын

Thank you for your kind words and comments 😊

Some excellent content for those of us not fortunate enough to be around helicopters. Even when i flew as a private pilot they were the unicorns you never got a chance to even get close to. And always financially out of reach as well. Thanks for the series

@flyhighytb

9 ай бұрын

It’s never too late 😉

Great video thanks. Did all my rotary theory back in the ‘80s, written in text books from the ‘50s by and large! Hey ho Bernoulli and Newton had it figured out even earlier, nothing in the basics seems to have changed much. Also, thank goodness I found out you come from SA, was just about to congratulate you on your English…..! - what I should be saying perhaps is congrats on your French, I’m also doing flying things in 🇫🇷 and am just about circuit language capable! 😊 Keep up the good work, thanks for your content.

@flyhighytb

6 ай бұрын

Thanks for the kind words. Keep me updated on your adventures. 😀

I very liked your videos. Just need to comment on one thing. The rotor disc tilt does not happen because of gyroscopic precession. The gyroscopic moment happens when a moment in inertial frame (gravity in your example) is applied to a rotating system. In the helicopter rotor disc tilt, this is not happening. What happens is that the pitch input is (almost) in resonance with the flapping response. Resonance means 90 deg phase delay so the response (flap) happens 90 deg after the input (pitch). For example if the pitch is minimum at 3 o'clock position then the flap will be minimum at 6 o'clock. This also means that the pitch is max at 9 and flap is max at 12. So the rotor disc tilts forward since 6 and 12 o'clock are min and max flapping. This changes the direction of the thrust vector.

@flyhighytb

8 ай бұрын

Thanks for the contribution 😀

@Ben-Dixey

8 ай бұрын

I agree, it's not gyroscopic preccession. The R22 has a phase lag of 72 degrees. Why is this not 90 like in your description ?

@chippyjohn1

6 ай бұрын

@@Ben-Dixey The presentation of a wheel spinning does not compensate for cyclic pitch. If you had a mass that could separate from a rotating disc where the centrifugal force is equal to the radial force its trajectory would be 45 degrees (assuming it is aerodynamically neutral in shape) tracing back this tangent would give you 90 degrees advance of the rotating disc. However helicopters are in a constant state of pitch which interferes with gyroscopic precession, as they are designed to make lift, not just have the rotors spin. Depending on pitch and how much force it exerts will depend on the phase lag that manufacturers account for in design. The 72 degrees you mention will actually vary depending on cyclic (differential) pitch applied. So upon pressing forward of the cyclic, depending on how much collective you are also applying the rotor may advance or retard several degrees of what you are actually doing. This goes unnoticed with the controls from the pilot in small amounts, but obviously they want to get it as close as possible from the beginning. So if you sat in a R22 and had the rotors spinning on the ground with neutral lift and had a laser lever on the rotor you would find the rotor would move approximately 90 degrees aft of the control rod input, And if the controls where set up with 90 degree advance you would just push forward, but as you started to increase collective you would start to move the cyclic slightly to the right to compensate for cyclic forces acting against gyroscopic precession. Once again, most would not really notice even 18 degrees cyclic out, but the closer the better and it does not stay constant, also depends on how quickly you apply the force with the cyclic. That is something none of the gyroscopic presentations on the internet explain. Same with autorotation, they all say a helicopter will just gracefully land without power, but none mention disc/blade loading. If a larger helicopter has to autorotate at 3 times the rate of descent of a smaller helicopter while arresting 30 times the force, it is far from graceful. Hope you are well Ben, I'm still working. All modern helicopters have some phase lag built in, not just the Robinson.

@flyhighytb

5 ай бұрын

Fascinating 🧐

@Ben-Dixey

5 ай бұрын

@@chippyjohn1Thanks for this John, I've not heard this way of explaining it before. It's hard for me to grasp but does your explanation agree with the system in resonance explanation? I can kind of grasp that one being that a weight on a string swinging will result in maximum displacement 90degrees after the disturbance. Add a hinge somewhere on the string and that changes things. Do you know what phase angle the Bo105 has ? As an example of a hingeless rotor system. Glad to hear you are still working 👍

An excellent explanation of what seems to be a horrible idea.

@flyhighytb

Жыл бұрын

😃

So, when you push the stick forward, does that make the pitch angle of the blade toward the back higher than the blade in front? Or is the gyroscopic reaction used such that increasing the lift on the left side and less on the right side essentially causes the pitch of the overall helicopter to rotate nose down?

@flyhighytb

5 ай бұрын

Yes👍🏻

@toddb930

5 ай бұрын

@@flyhighytb -- thank you for the reply. Would you please clarify which example the 'yes' applies to?

@flyhighytb

5 ай бұрын

Yes to gyroscopic precession. If you push the cyclic forward, you will increase the pitch on the left side of the rotor disc but it will manifest 90 degrees later at the aft side of the rotor disc causing the helicopter to move forwards.

@toddb930

5 ай бұрын

@@flyhighytb -- thank You so much for clearing up this mystery for me! 😁👍

@flyhighytb

5 ай бұрын

You’re very welcome 😉

The correct theory of lift is all three. On small scales it is hardly noticeable if the airfoil is not perfectly shaped, you can just "wing it" ;) One question: Could the torque produced by the rotor be counteracted by a tilted plane on the tail boom deflecting the downward airstream from the rotor to one side?

@flyhighytb

Жыл бұрын

Thanks for your comment 😁 and your question which is the idea behind the NOTAR system.

@Willy_Tepes

Жыл бұрын

@@flyhighytb The question was actually more like, can torque on a helicopter be counteracted the same way as on an airplane, with only deflecting surfaces. Or does the larger diameter and air resistance of a rotor require a tail rotor or ducted fan like the NOTAR system? The vertical stabilizers on the NOTAR system seem to be movable. Do these have any effect while hovering or only in forward flight?

@flyhighytb

5 ай бұрын

Unfortunately my expertise in NOTAR helicopters is very limited. Hopefully someone in the community will be able to answer your questions.

A mixture of all 3

@flyhighytb

Жыл бұрын

Good answer 👍

From India ❤️

@flyhighytb

Жыл бұрын

Back at you !

@suryakantkaushik6385

Жыл бұрын

@@flyhighytb like you 🙏🌹

the swash plate part....i had no idea...

@flyhighytb

Жыл бұрын

😁

Reluctantly like a bumblebee

@flyhighytb

Жыл бұрын

🐝

Great video. Tnx! Flying principle out of the box: outside vacuum pressure - neither Bernouli, nor Newton, nor Coanda. We can call it OVP theory. Just kidding! ;)

@flyhighytb

4 ай бұрын

Thanks for the great comment!😅

@user-hp1mt9du6t

4 ай бұрын

@@flyhighytb You're very much welcome! :)

Truth be told: The helicopter was actually invented by Coanewlli. Sorry, I could not keep it a secret any longer, after all these years! There you have it, with my compliments. PS. The presenter is very pretty.

@flyhighytb

11 ай бұрын

Oh wow ! Would love to hear more 😁

@ericklassen742

11 ай бұрын

@@flyhighytb Hey, Good to hear from you. Coanda, Newton and Bernoulli (Coanewlli) deserve equal credit for this wonderful flying machine. Many have heard of Newton, some of Bernoulli, few of Coanda --- you brought them all together making it clear how each played a roll in this type of flying. The complicated operation of the "frantic" changes of angle of the main rotor, as you vary direction, are known to only very few of us. As to the presenter: Aside from your obvious knowledge of the subject matter, and the fact that you are cute, are purely complimentary and, hoefully are received in the same spirit as I intended. Add to that, your wonderful accent, it is clear to me that, ONE, I need to learn to speak after all these years and, TWO, the choice of you making this presentation made it perfect. Thanks for both! Eric

@flyhighytb

5 ай бұрын

Compliments taken well and you’re very welcome.

Helicopters don’t want to fly.

@flyhighytb

11 ай бұрын

But they do it so well 😃

All I know is that some extremely attractive lady is on screen trying to make me pay attention to what she is teaching, but I find concentrating difficult.

@flyhighytb

Жыл бұрын

😂

@martyndavid2094

3 ай бұрын

@@flyhighytbabsolutely hot