- 37
- 4 620 917
bzig
United States
Приєднався 3 вер 2022
Universal Joint Motion
Video simulation showing the function of a universal joint, including the equations of motion.
Переглядів: 1 658
Відео
Helicopter Drive Systems and Hunting Tooth Gears
Переглядів 32 тис.3 місяці тому
A video describing hunting tooth gears used in helicopter drive systems. Hunting tooth designs reduce noise and vibration and improve the longevity of gears. They do this by ensuring that every tooth in a gear pair meshes with every other tooth in the opposing gear. link to my earlier video on helicopter drive systems: ua-cam.com/video/iG0WC2ewM4I/v-deo.html References The Hunting Tooth and its...
Helicopter Swashplate Control
Переглядів 200 тис.4 місяці тому
#helicopter #swashplate This is a 3d model of a helicopter control system that I use to explain how a swashplate is used to transfer non-rotating control inputs to a rotating control system. I explain rotor degrees of freedom and how control of these degrees of freedom is passed into the rotating control system. Towards the end of this video, I refer to another video that explains control phase...
Helicopter Gear Reduction
Переглядів 828 тис.4 місяці тому
This video shows how a helicopter drive system transfers power from the high speed output of a gas turbine engine to a helicopter's rotors 00:00 Intro 01:15 Engines 02:10 High Speed Shafts 02:36 Freewheeling Units 03:32 Combining Gear 03:52 Bevel Gear 04:37 Planetary Gear 05:26 Tail Rotor Gears 06:05 Tail Rotor Drive Shaft 06:24 Intermediate Gears 06:48 Tail Rotor Gears
helicopter rotor control - phase delay
Переглядів 66 тис.10 місяців тому
How a helicopter works Helicopter aerodynamics and rotor control - phase delay The concept of helicopter control phase delay is that the maximum aerodynamic force applied to a helicopter rotor blade takes some time before it manifests as a control input. This is referred to as phase delay by some texts, and gyroscopic precession by others. For typical helicopters this delay is about 90 degrees ...
Single Main Rotor Helicopter Animation
Переглядів 677 тис.11 місяців тому
Animation of a single main rotor and tail rotor helicopter showing swashplate control of the rotors and the reduction gearing from the two turboshaft engines
single main rotor helicopter
Переглядів 10 тис.Рік тому
work in progress... next step is to rig the main rotor controls, blade degrees of freedom and tail rotor control
Intermeshing Helicopter Rotors with Swashplate Control
Переглядів 3,7 тис.Рік тому
Synchropter helicopter, also called an intermeshing, or intermesher helicopter 0:00 Scene 1 0:42 Scene 2 1:16 Scene 3 1:49 Scene 4 2:26 Scene 5 Most intermeshing helicopter designs are two bladed (two blades on each mast) such as the Flettner 282 Kolibri and Kaman's K-1200 Kmax and H-43 Huskie. But the first US designed intermeshers were three-blade designs; these were the Kellett XR-8 and XR-10.
Fusion 360 - Hypoid/Hyperboloidal Gear
Переглядів 1,5 тис.Рік тому
Fusion 360 - Hypoid/Hyperboloidal Gear
Types of Airplane Contra-Rotating Propeller Drives
Переглядів 8 тис.Рік тому
Types of Airplane Contra-Rotating Propeller Drives
Contra rotating propellers with a planetary gearbox
Переглядів 63 тис.Рік тому
Contra rotating propellers with a planetary gearbox
gear options for 90 degree direction change
Переглядів 10 тис.Рік тому
gear options for 90 degree direction change
Contra-Rotating Coaxial Propeller Drive
Переглядів 571 тис.Рік тому
Contra-Rotating Coaxial Propeller Drive
p
coaxial
Hello I’ve been a helicopter maintenance technician and technical instructor for a number of years and your videos are excellent. However, to explain the helicopter flight control system, I suggest in using a two-blade rotor system and a swashplate with a 90° control input regime rather than a swashplate having 120°. For students it would be easier to understand the influence of the gyroscopic precession on the flight controls. Keep up the good work!
Thanks for the feedback! I'm working on a 4 blade model for the exact reason you say... It's easier to see and understand things like forward flight disymetry of lift and precession
@@bzig4929 Sounds great! I have suggestion for another project. Students often have a problem understanding the functioning of a so called “phasing unit”. For example, such a unit is installed in the flight controls of a Super-Puma. The unit rephases the 90° cyclic input signals to the 120° regime required by the swashplate. It would be great to have an instruction video showing the concept.
Can you make a coaxial propeller animation or how it works? I want to know because im trying to make a homemade helicopter
I did a coaxial prop. It's one of my earlier videos. If you meant a coax rotor and the flight controls... Yes, that would be cool. Good luck with the helicopter.
You’re great. I just designed a 14 to 1 gear reduction unit for an extruded concrete curb machine in Solidworks. Your helicopter unit is really amazing. Old man Sikorsky must have been an amazing designer. A lot of time passed from the Wright brothers work to his. No wonder. Thank you for all the work you put into this video. I’m subscribing.
Thanks for the sub and the nice comment!
Well, synchropters from the Command & Conquer game series (GDI Hammerhead from C&C 3: Kane's Wrath and USSR Twinblade from Red Alert 3) no longer seem like fiction.
Might've been worth using an initial speed of 10,450 RPM ... so that it also converts easily into HP (if HP matters, and not lb ft)..? Of course ... by reducing the RPM that's a massive increase in torque. Is the ~250 rpm the constant speed of the engine in which torque varies..? How is power varied ..? Does the 5% forward can't mean that 95% of the energy goes into lift..? Would there be any benefit to adding lift-producing fixed stubby wings on a helo ..?
Wow! Good questions. The 5 deg fwd tilt doesn't change the lift distribution by itself. For example, in a hover, 100% of the lift is vertical, but the helicopter has to hover 5 deg nose high in order to make it vertical. To transition to forward flight, the rotor disk tilts forward... Now, some of the lift is vertical and some is horizontal. Without the 5deg forward tilt, the helicopter would have a nose down attitude in forward flight. Power is varied by changing the collective pitch of the rotor blades. The increase in pitch increases lift, and also drag; because of the drag increase the rpm would tend to reduce, but this reduction is sensed by the fuel control unit which the sends more fuel to the engine. The FCU maintains engine RPM constant, regardless of the load on the rotor system.
If only I had the internet when I was younger....
Suddenly realised at 75 I'd never managed to study this properly...thank you so much for a perfect lesson!
Wow, this is amazing
Good sir
loved it when you said so many of us Geek out and yes Because I am a mechanical Engineer that makes me a nerd and a geek LOL Great video well explained and no shit music
Those joints doesn't bring much confidence
you still have a lot to learn
I believe we all do.
This mechanism doesn't bring much confidence to its durability and dependency.
That's really cool! I didn't know the main rotor turns so slowly. When I see one, it seems to be rotating much faster.
This is the first time that I halfway understood power transmission in a helicopter, many thanks for the thorough explanation! I still keep wondering how the turbines can start up without turning the rotors from the first revolution. I suppose the gas generator starts up independently, and once it provides enough energy, it starts to turn the power turbine and power transmission?
Yes, You have this correct. Because the gas generator isn't mechanically connected, there is a delay before the rotor blades start turning... I would say the rotor doesn't start turning until thr gas generator reaches about 39% of its maximum rotation speed. It's also possible to operate the engine at 100% gas generator speed with the rotor completely stopped... This is done by starting the engine with the rotor brake engaged. I flew one helicopter where we routinely stated both engines against the brake and the released the brake when it was time to spin the rotors.
just a curiosity, if the two gas turbine engines rotate at a small different rpm, how does it syncronize to the bull gear ? or would it intervene to the bull gear reducing the performance ?
Interesting question! They cannot operate at different RPM. Here's an apology... Two people are pushing a very heavy object. One person does 90% of the effort, and the other person hardly exerts any effort. Regardless of the difference in effort, they both move at the exact same speed... The speed of the object they are pushing. It's only at the point where one of them stops (analalogous to a failed engine) that there is a speed difference. As long as both of them are applying force, they move at the same speed. A dual engine helicopter (or a tandem bicycle) works the same way... As long as both engines produce power, the accelerate to, and operate at, the speed of the combining gear.
Great presentation.
Excellent graphics! What I am confused about is what you are trying to tell about the 45 degrees and the 30 degrees. quote "The swashplate is centered at 30 degrees." . What do you mean by that? Gyroscopic precession - that is the term in my physics books - implies, that on a rotating mass the force orthogonal on this mass will the place exactly 90 degrees after the force has been imposed on the object. Flapping angle has to be deducted, but only if you have a rotor head allowing blade flapping. Bo 105, Blackhawks etc do not have flapping blades. The 30 degrees thing and the 45 degrees thing, ... what is that?
I could have done better with that. Switching from 30 to 45 didn't help. The point I was trying to make is that there is a 90 degree difference from where the force is applied to where its effect is felt. But, the mechanical attachment point isn't 90 degrees away, so it appears like it's not a 90 degree difference.
@hangar4851 Gyro precession is at 90 degrees and that applies to the main rotor blades. If you do an analysis of a gyro as a bunch of separate weights around the wheel. it is easier to understand precession. There are You Tube videos showing this. However, I've heard an explanation of why in practice it isn't precisely at 90 on a heli. There are other secondary forces, but don't recall all the detail now. . In addition, for example,, when applying collective and power going forward, the tail rotor also puts additional side thrust that must be compensated for by the main rotor counteracting to the other side or you start forward motion at an angle at an angle. . A heli pilot I talked to said some helis you start forward with the stick slightly to one side and bring it gradually forward. . It's V-E-R-Y complex. . PLUS, not all helis are rigged the same due to configuration and computer control differences. - - I talked with my AE son who did some heli rigging at Embry-Riddle Aeronautical University.
Nice job!
Excellent presentation.
I love your videos - thank you. Would you kindly consider doing videos on coaxial rotor helicopters (such as the Kamov Ka-25), and tiltrotor aircraft (AW609, Bell V-22 & V-280) in the future? Particularly what made tiltrotors difficult to develop and iron out its kinks.
256RPM...?😢😮😢😂😂😂😂
one hellava gearbox !
Its Not Gas Generater its COMPRESSOR Its NOT TURBAN its TUR-BINE turban is what Hindu-Stani be wear 👳
Oh. How do you pronounce "engine?"
@@bzig4929 Jhaggg-Waaaaaar ??? 😃
Gyroscopic procession is definitely the more general term
😊😊❤❤❤
Aw some explanation. You should make graphics for class rooms.
Thanks!
Awesome!
What's the safest altitude for autorotation ?
The answer is somewhat unique to each helicopter. All helicopter flight manuals publish a "height velocity envelope" that has this information. It's not just an altitude question, but it also involves the airspeed at the time of engine failure. For most helicopters, at low speed,, 500 ft is safe for an engine failure. Flying faster means you can go lower, up until around 50' where high speed engine failures become hazardous. Autorotation is the means to turn potential energy into kinetic energy in order to arrest the rate of descent. Potential energy is stored in airspeed, altitude and rotor system inertia.
2 inches
What is the benefit of writ the English language it is hide the v. important pictures
عجبا كيف يثق اتناس في هاته الوليب
Super!!! 🇺🇦❤️
Excelente Gracias
Cool. Thanks for sharing.
Thanks..
Приводы отчего работают?
ua-cam.com/video/JXAFI2CITJo/v-deo.htmlsi=2Y69tlo2DRUiTKWX
Your animations are awesome. Can you make one about collective and cyclic mixing? Like a summing bellcrank.
That would be cool. I'll add it to my list. I'm working on one showing the balance of forces on a rotor blade now. Thanks for watching!
ماشاء الله تبارك الله الملك الحور أرحمن أرحيم الله الملك الحق المبين الملك الخالق لي كول الخلق والمخلوقة وكول شيئ جل جلاله أسلطان وله الأسماء الحوسناء والحمد الله الملك الواحد وهو رب العالمين ومالكوناء وهو رب العرش العظيم الكريم وهو مالكه سبحانه وتعالى علوه الأكبر ☝️✍️🙌😄😍😗😙😘☝️✍️🙌💖💖💖💖♥️💖 والحمد الله على خيره كوله والحمد الله على خير خلقه كولهيم وأسلام الله عليكم وعليئ دأيمن وأبداء ورحمة الله وبركاته 😉😄😊😊♥️💖♥️💖💖💖💖💖💖💖
The helicopter is a symbol of stability and speed of maneuvering in the air at the highest levels of gravity, and this stability requires the heaviness to withstand the wind and the stable propulsion of the main propeller, and the length of the propeller is related to the lightness and effort of the material of its blade in balance with the resistance of the air and the wind...
Great Animation. Amazing
Thank you for the explanation. But does this count too for 2,4 or 5 bladed helicopters?
Yes it does. The phase delay will be 90 degrees if those rotors don't have offset (from the center of rotation) flapping hinges. The amount of difference from pure 90 degree phase delay is a function of the amount of hinge offset, not the number of rotor blades. Thanks for watching!
Coaxial motors. ua-cam.com/video/cz0V5u-IOII/v-deo.htmlsi=vb9B3u9-HM1phqx5
As far as I understand, EC-135 doesn't have any of these hinges (except feathering) and it still flies, is quite controllable, stable and doesn't vibrate. How come?
I wish you take a video about Semi-Rigid rotor system too…..
Thanks for this explanation. I was playing around with an RC helicopter and couldn’t understand why the blade pitch appeared to be out by 90 degrees. Now I know why!
Great job!