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.
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.
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.
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.
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.
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
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.
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?"
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.
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!!
Fantastic work! I'm a high time fixed wing pilot undergoing initial helicopter training. Although the models are for a far more complex helicopter than the Robinson Trainer, they're very helpful to visualize the aero and mechanical activities in a rotary wing design. The training programs in the light end of the helicopter seems devoid of CAD and animations that greatly aid in learning the subjects. I'd request model/animation of simple teetering system with the hope that you can capitalize on the product with flight training programs.
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.
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.
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.😅
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.
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.
@@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
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?
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.
@@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.
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.
Appreciate your work.
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.
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!
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.
I'm loving this series. You explain everything really well, and the animations are exceptional.
Thank you 🙏🏼
thanks! I appreciate you watching and commenting.
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.
yup... that was for you! I read your comment to vid #3. Thanks for watching and for commenting.
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.
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.
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
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.
Been flying them for 50 years I’ve never seen anything better great job….!
thanks!
This is amazing work. Thank you.
You love to see it
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?"
Thanks, I love the feedback. I'm working on another vid and I added more to the intro based on your comment.
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.
oh... I think you are correct! Thanks for the comment.
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!!
thanks for such a nice comment!
Fantastic work! I'm a high time fixed wing pilot undergoing initial helicopter training. Although the models are for a far more complex helicopter than the Robinson Trainer, they're very helpful to visualize the aero and mechanical activities in a rotary wing design. The training programs in the light end of the helicopter seems devoid of CAD and animations that greatly aid in learning the subjects. I'd request model/animation of simple teetering system with the hope that you can capitalize on the product with flight training programs.
I'm working on an R-44 teetering animation. Slow going... no promises when it will be done.
thank you👏👏👏
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.
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.
I was gonna ask why it wasn't fully articulated. But here is my answer.
so rad
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.😅
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.
How are the tail rotor shafts connected? Plate and bolts? Or is there some give with supporting bearings?
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!
@@bzig4929 Yes, I see them now. Thanks.
Why is trim adjusted by bending the tabs rather than adjusting the aoa via link rod length?
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.
@@bzig4929 Interesting, thank you!
how does a teetering rotor control? Does it rely on the blades being flexible?
I think there are teeters that have elastomeric feathering, but I also know of many (bell 206) with a mechanical feather bearing.
@@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
Do you model parametrically at all?
yes. I also use configuration tables for many of the common parts.
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?
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.
@@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.
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.