Thank you Dr Wang, I have recently been introduced to tiltrotor dynamics and this video gave me a great confidence boost in further studying this subject. you explained it so easily, even a person with zero background in helicopters understood the concept. less math and more focus on the core, thanks so much
I have been designing a VTOL high altitude aircraft that is different to everything currently available to fly at 26000m. While designing it I needed to control yaw at low altitudes. This gave me a great idea for the yaw control of a helicopter, another design that has not yet been used, being more efficient and simple than current designs. I hope to set an altitude record for the helicopter first of 13500 metres HOGE, not forward flight. People do laugh, but it is true, if it can be dreamt, it can be built.
How did you managed to tell the Helicopters history and didn’t mention names like these Yuriev, Mil, Kamov...? Have you ever herd about swashplate? But thanks for photos!
Hello sir thank you very much for this excellent presentation i have i now been able to reliably destroy targets in my YAH-64 in War Thunder Ground RB. Thank you again this is master work
Everything helicopters It’s very hard. I’ve read dozens of them. At the beginning you will not understand anything. The best for me is Helicopter Dynamics by Wayne Johnson. If you want to get into it watch ruclips.net/video/KdH2-rKEyNY/видео.html awesome resource for beginners. But expect to spend a whole month studying to understand.
Helo dear sir i am sri lankan .i bacher of mechatronic engineering . I need do masters about missiles technology and fightinng. aircraft please tell me what are best univercity and programas. ( specialy germen , switerland , europ)
Is there anybody here who could answer few questions about helicopter aerobatics (particularly loop and barrell roll), or where can I look for the answers?
Well I have heard that helicopters cannot go upside down, which makes sense given the way the helicopter gets lift so I'm going to guess they cant dothat but I'm no expert
History has a lot of lessons check 50's successful flying soldier platforms . The easiest & safest is bigger version of toy grade coaxial heli but rotor overlap decreases efficiency about 20 %. 1. Tandem rotors most efficient. 2. Just apply 45 deg flybar to each for STABILITY 3. Keep them Overhead & have pilot capsule for SAFETY 4. Don't use collective or cyclic for SIMPLICITY instead attitude control using body weight.on pilot seat hanging as pendulum 5. Small pusher prop with fin for PROPULSION & direction. 6. Lipo & let rotors be EDF to act as safe simple power system 7. Q. long recharging times b/w flights? Let there be battery stations just like gas stations where.u turn in empty battery & pick up standard size charged one.
I just started the video so I don't know if Dr. James Wong will address my question of: why do some helicopters have 2 lifting blades (Bell Heuy, Cobra) and some have 4 (Apache) and some have 7 (CH-53, mil-24 HIND)? Others will have 5 or 6 or whatever, I just want to know what is the purpose of using more than 2 lifting blades.
Generally, more blades can decrease the vibration level of a helicopter. And fewer blades mean higher blade loading, which is not feasible for heavy-lift helicopters such as the CH-53s. Furthermore, the blade number is related to the spanwise blade chord distribution, which affects the rotor performance by changing the spanwise lift distribution. Besides, the helicopter's rotor blade design should base on the special mission requirement. For example, the AH-64's and UH-60's blades' chords should be wide enough to gain damage tolerance. Still, the rotor rotation speed should be as low as possible to reduce the noise level. And lots of actual requirements make the designers decide on the final blade number.
@@HonestYu Also, the larger the cord, or width of the blade (the wing) the more lift it can produce compared to a rotor with a smaller cord or width... A larger cord/width moves more air than a smaller width, and can do so at lower rpm. A smaller cord or width would need to spin at a higher rpm to produce more lift...
thanks. nice explanation. @goflyprize, if you have Module 12 HELICOPTER AERODYNAMICS, STRUCTURES AND SYSTEMS and can you share these slides or help me where can I find this and similar power point slides? I would be very happy if you could help.
8:00 His force moments are wonky. Main rotor thrust is downward. It results in an upward movement, though. Tail rotor thrust is in the opposite direction of the movement that results.
No, in helicopters, and I think aerospace in general, thrust is defined as the reaction force in the blade elements. Thrust vector in the helo is generally center of rotor hub, perpendicular to rotor disk, pointing up. In airplanes T is located at the center propeller directly forward.
Thank you Dr James Wang for this wonderful lecture. Simple to understand without too much funky mathematic
Omigosh ! I fly RC model helicopters and I found this lecture to be very informative.
Very clear explanation and illustrations. It is so well done to be able to explain the physics of how helicopter works and flies.
Thank you Dr Wang, I have recently been introduced to tiltrotor dynamics and this video gave me a great confidence boost in further studying this subject. you explained it so easily, even a person with zero background in helicopters understood the concept. less math and more focus on the core, thanks so much
coolest lecture i ve ever sat through❤️
The best explanation of helicopter. Thank you Doctor.
I have been designing a VTOL high altitude aircraft that is different to everything currently available to fly at 26000m. While designing it I needed to control yaw at low altitudes. This gave me a great idea for the yaw control of a helicopter, another design that has not yet been used, being more efficient and simple than current designs. I hope to set an altitude record for the helicopter first of 13500 metres HOGE, not forward flight. People do laugh, but it is true, if it can be dreamt, it can be built.
How did you managed to tell the Helicopters history and didn’t mention names like these Yuriev, Mil, Kamov...? Have you ever herd about swashplate? But thanks for photos!
it's great to face the reality - laws of Physics :-) However, think outside of the box and never give up the flying dream!
Hello sir thank you very much for this excellent presentation i have i now been able to reliably destroy targets in my YAH-64 in War Thunder Ground RB. Thank you again this is master work
Nice👌
What a awesome explanation
Suggest a book for helicopter and aeroplanes design
Everything helicopters It’s very hard. I’ve read dozens of them. At the beginning you will not understand anything. The best for me is Helicopter Dynamics by Wayne Johnson. If you want to get into it watch ruclips.net/video/KdH2-rKEyNY/видео.html awesome resource for beginners. But expect to spend a whole month studying to understand.
I tried listening to this video, but the AUDIO was too low.
Helo dear sir i am sri lankan .i bacher of mechatronic engineering . I need do masters about missiles technology and fightinng. aircraft please tell me what are best univercity and programas. ( specialy germen , switerland , europ)
Is there anybody here who could answer few questions about helicopter aerobatics (particularly loop and barrell roll), or where can I look for the answers?
Well I have heard that helicopters cannot go upside down, which makes sense given the way the helicopter gets lift so I'm going to guess they cant dothat but I'm no expert
@@harrier827 it shows you didn’t watch this lesson the end :-) Check 48:00 and you get an idea.
History has a lot of lessons check 50's successful flying soldier platforms .
The easiest & safest is bigger version of toy grade coaxial heli but rotor overlap decreases efficiency about 20 %.
1. Tandem rotors most efficient.
2. Just apply 45 deg flybar to each for STABILITY
3. Keep them Overhead & have pilot capsule for SAFETY
4. Don't use collective or cyclic for SIMPLICITY instead attitude control using body weight.on pilot seat hanging as pendulum
5. Small pusher prop with fin for PROPULSION & direction.
6. Lipo & let rotors be EDF to act as safe simple power system
7. Q. long recharging times b/w flights? Let there be battery stations just like gas stations where.u turn in empty battery & pick up standard size charged one.
Dr wang thank you for introducing helicopters !
I just started the video so I don't know if Dr. James Wong will address my question of: why do some helicopters have 2 lifting blades (Bell Heuy, Cobra) and some have 4 (Apache) and some have 7 (CH-53, mil-24 HIND)? Others will have 5 or 6 or whatever, I just want to know what is the purpose of using more than 2 lifting blades.
Generally, more blades can decrease the vibration level of a helicopter. And fewer blades mean higher blade loading, which is not feasible for heavy-lift helicopters such as the CH-53s. Furthermore, the blade number is related to the spanwise blade chord distribution, which affects the rotor performance by changing the spanwise lift distribution.
Besides, the helicopter's rotor blade design should base on the special mission requirement. For example, the AH-64's and UH-60's blades' chords should be wide enough to gain damage tolerance. Still, the rotor rotation speed should be as low as possible to reduce the noise level. And lots of actual requirements make the designers decide on the final blade number.
@@HonestYu
Also, the larger the cord, or width of the blade (the wing) the more lift it can produce compared to a rotor with a smaller cord or width... A larger cord/width moves more air than a smaller width, and can do so at lower rpm. A smaller cord or width would need to spin at a higher rpm to produce more lift...
Cool. Thanks!
Very cool! :)
thanks. nice explanation. @goflyprize, if you have Module 12 HELICOPTER AERODYNAMICS, STRUCTURES AND SYSTEMS and can you share these slides or help me where can I find this and similar power point slides? I would be very happy if you could help.
23:16 Helicopter history
8:00 His force moments are wonky. Main rotor thrust is downward. It results in an upward movement, though. Tail rotor thrust is in the opposite direction of the movement that results.
No, in helicopters, and I think aerospace in general, thrust is defined as the reaction force in the blade elements. Thrust vector in the helo is generally center of rotor hub, perpendicular to rotor disk, pointing up. In airplanes T is located at the center propeller directly forward.
ОООЧЕНЬ ИНТИРЕСНО НО НЕ ПАНЯТНО !!
Odd that i can hover a helicopter quite easily but balancing a broomstick is quite the challange for me...
it's great to face the reality
The challenge is size? How about the weight prifessor?
nice Sir I m Kashmir boy thxg
This looks hard to achieve
This dude already may have the contest sewed up , ruclips.net/video/UmlyrNQczuc/видео.html . Wonder what he's going to do with the two million bucks .
Please….Leonardo is this the best you can think of the box?
Never thought the jet is noisy ..
BS. Noise? Jet is very very noise …thank you professor!
He emphasizes always how difficult it is to fly , not inspiring
the sucking tongue sound he do made me stop the video. Drink water, a lot of water when your a speaker. too bad .
Do we need all this master to understand helicopters? He did not touch the Kaman system because probably he don’t know how it works.. waste of time