How a Helicopter Works - Part 4

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** correction to this video... I called this type of rotor system a semi-rigid rotor because it only uses elastomeric bearings for flapping and lead lag. This is not l a semi rigid rotor **
This is the fourth in a series of videos where I'll create a 3d, animated model, of a helicopter. My intent with this series is to end up with a realistic 3d animation of a helicopter; one that I can use in future videos, to show how a helicopter works.
In this video I explain:
- The rotating and non-rotating swashplate degrees of freedom
- Rotor degrees of freedom: feathering, flapping and lead-lag
- The function of the rotor hub
- More detailed information about the rotor blades including the blade airfoil sections and the function of the trim tabs
The purpose of doing this as an incremental build is to seek viewer feedback on this model so I can make adjustments to the design and also learn how to better explain the concepts covered in the video.

Опубликовано:

15 сен 2024

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Комментарии : 45

@cepaasch 29 дней назад

Very good animation of a Blackhawk rotor system. (Stationary Swashplate) Cant wait to see the final result. I can only imagine the work that goes in to this.

@bzig4929 29 дней назад

It's a lot of work, but I get into my zen zone and crank away at it 🙂. Thanks for taking the time to comment!

@jimihendrix6969 Месяц назад

Appreciate your work.

@RyanPlate 29 дней назад

Your attention to detail is immaculate, and your understanding/application of Blender is admirable. I would love to see you pivot into a helicopter ground school animation provider. I'm a fixed wing pilot, but if heli ground school is anything like ours, it could benefit from a fresh take.

@danrichards8240 29 дней назад

I'm loving this series. You explain everything really well, and the animations are exceptional. Thank you 🙏🏼

@bzig4929 29 дней назад

thanks! I appreciate you watching and commenting.

@madeupwithit 29 дней назад

Amazing, again. I dont know if it is because i am a mechanical engineer who uses CAD, but this seems the perfect way to learn these topics. I enjoyed the touch on aerodynamics. Just been learning why Nr increases during a flare. No one seems to have presented that intuitively.

@bzig4929 24 дня назад

Thanks for the comment! A few years back, I was working flight test and someone decided to recreate an aircraft data point in a simulator; then they turned it into a video... The insight that came from that one video was so much richer than looking at a thousand time histories. Technical subjects are much easier to understand with visualizations.

@ahmeduygun7320 29 дней назад

Very much appreciated. You touch upon many different subjects briefly. Maybe focus on smaller things more in-depth in your future videos? Such as trim tabs and track & balance process. I work in the industry (albeit not directly on rotors) but still learning a thing or two from your videos

@bzig4929 28 дней назад

That's a really good suggestion. Right now, I'm focused on completing the model, so that's making me drift around a bit. I'll try to narrow the topics once it's done.

@Filmpilot 19 дней назад

Been flying them for 50 years I’ve never seen anything better great job….!

@bzig4929 18 дней назад

thanks!

@PetesGuide 29 дней назад

OMG! 2:48 to 4:51 is the response my comment/request! Thank you so much, and I learned a lot from even this preliminary answer. Can’t wait for the full video. Hopefully one day I’ll be able to return the Chanel when I can get my channel going.

@bzig4929 29 дней назад

yup... that was for you! I read your comment to vid #3. Thanks for watching and for commenting.

@peterhassing9710 Месяц назад

Fantastic stuff! But not sure you are right about the hub being semi-rigid. A semi-rigid hub is found only on two bladed helis where the blades flaps together on a teetering hub. Modern hubs with elastomeric bearings for all movements are called "soft in plane" (Bell) or "spheriflex" (Airbus) Kind regards.

@bzig4929 Месяц назад

oh... I think you are correct! Thanks for the comment.

@shyneus9773 Месяц назад

You love to see it

@GordonWrigley 25 дней назад

I really appreciate the intro. I've been following along so I'm ok but I know often before I've dropped into the middle of a series and sat through the whole thing wondering "what are we doing and why?"

@bzig4929 24 дня назад

Thanks, I love the feedback. I'm working on another vid and I added more to the intro based on your comment.

@stachowi 29 дней назад

This is amazing work. Thank you.

@ronaldgreen5292 29 дней назад

This a beyond excellent computer animation presentation!!👍👍👍💯💯💯😳😳 Keep up the good work, and do more details on different helicopter models! My favorite: Hughes 500/ MD 500 series, please!!

@bzig4929 29 дней назад

thanks for such a nice comment!

@ImpendingJoker 29 дней назад

I am sorry to be the guy to tell you this but, seeing as how this is based on the UH-60/S-92 rotor head that I have torn apart and put together, several times in my military and civilian career, this is a fully articulated rotor head, not a semi-rigid. Semi-rigid rotor hub would be like the one found on the Bell 222. Whereas a rigid system would like those found on the Bo-105.

@bzig4929 29 дней назад

yes! I corrected that in the comments. I've been calling these (flap and lead lag via the elastomer, but feathering via a mechanical bearing) semi-rigid for the last 30 years. This is the first time I've been corrected... but I see that wikipedia and the RFH agree with you. I also like fully-articulated as a description because flapping-feathering and lead-lag all have an axis of rotation. Terminology is hard :) Thanks for watching and for taking the time to comment.

@madeupwithit 29 дней назад

I was gonna ask why it wasn't fully articulated. But here is my answer.

@mashallahjamshidi8014 Месяц назад

thank you👏👏👏

@ofdlttwo 29 дней назад

so rad

@Mouss-44 17 дней назад

Hello, what is the purpose of this blade movement? Is it to create flexibility? I thought I understood how a helicopter works and I'm starting to have doubts.😅

@bzig4929 15 дней назад

That's not a short answer but I'll try... Feathering is for control of the aircraft. Feathering creates forces that allow the blades to flap...flapping is also necessary for control and also to correct for a thing called forward flight dissymmetry of lift. Lead lag conserves angular momentum of the blades as they flap. So all three DOFs are interrelated.

@seaplaneguy1 29 дней назад

How are the tail rotor shafts connected? Plate and bolts? Or is there some give with supporting bearings?

@bzig4929 29 дней назад

Those are called flex plates. That allow for minor changes in alignment that happens when the tail boom flexes under aero loads. Thanks for watching!

@seaplaneguy1 29 дней назад

@@bzig4929 Yes, I see them now. Thanks.

@madeupwithit 29 дней назад

Why is trim adjusted by bending the tabs rather than adjusting the aoa via link rod length?

@bzig4929 29 дней назад

You actually adjust three things... pitch link length, trim tabs and adding/removing weights from the blade tip. When I first started in the industry, we had to install test equipment on the aircraft to collect the data for the adjustments. Now, most aircraft have this gear installed all of the time. And the process has gotten so good, it's normal, now, to complete a track and balance in just one or two flights.

@madeupwithit 29 дней назад

@@bzig4929 Interesting, thank you!

@GOAFPilotChannel 29 дней назад

how does a teetering rotor control? Does it rely on the blades being flexible?

@bzig4929 28 дней назад

I think there are teeters that have elastomeric feathering, but I also know of many (bell 206) with a mechanical feather bearing.

@GOAFPilotChannel 28 дней назад

@@bzig4929 thanks, maybe my phrasing wasn't super clear. I was more asking how any moment gets transferred to the heli if the blade teeters at its center

@newklear2k 29 дней назад

Do you model parametrically at all?

@bzig4929 28 дней назад

yes. I also use configuration tables for many of the common parts.

@GreatJO 28 дней назад

Excellent animation! I have a question, why does the tail rotor drive shaft input pinion mesh the top side of the bevel gear? Why doesn't it mesh the same side of the bevel gear just like the engine input pinions?

@bzig4929 28 дней назад

I'm not sure why the original designers did it that way, but if you did it with the same gear as the engine inputs, there would have to be another gear in the system to change the direction of rotation. So... Either way, it caused then to add another gear. That double bevel looks like it's really hard to manufacture.

@GreatJO 27 дней назад

@@bzig4929 I did some searching and I believe the reason is that the spiral bevel gears are handed, which means they have a preferred rotation direction when acting as the drive gear.

@bzig4929 27 дней назад

yeah... I'm not a mechanical design person (I am an engineer) and in researching this I think I learned that it's proper to drive helical gears such that the pinion drives from the concave flank. Which is interesting about the black hawk design because the TR drive gear is driven from the convex flank. I found a video on line of a cut-away view of the blackhawk main transmission... what I animated is true to that video.