How Is Maneuvering Speed Determined?
Вставка
- Опубліковано 1 лип 2024
- If you've ever wondered how engineers find an airplane's maneuvering speed, here's your chance to understand the concept in non-technical terms. That's right! No math here. Sit back, relax and let Rod Machado help you better understand Va and how it's determined.
Rod Machado i can't belive.... in 2001 this guy learned me how to fly wit my very first Microsoft Flight Simulator... after 20 Years i'm looking his videos to pass last ATPL exam.... EPIC! Thank You very much !
A very cogent explanation of a topic that is usually described in no more detail than "VA is the speed at or below which full deflection of any control surface will not cause damage to the aircraft." That may be the textbook definition, but it doesn't actually tell you *why* that is the case. This video explains why. Excellent!
Thank you, Jordan. I appreciate the comment very much.
Rod
The best explanation in the entire interweb !
This video and its part 2 has been an invaluable resource as I prepare for my CFi checkride. Thank you so much for providing this info in an easy to understand format!
I'm up for my commercial rating and still find myself back at Rod Machado's videos to break it down in terms that I can re-use in the checkride AND during flying. Love your video's Rod! And love your optimistic approach to any subject..
My flight instructor sent me here to figure out Va as I was having issues with the concept. Not only do I now get it, but I also got entertainment in the way of the cheekiness Rod put into this video. I was wearing a headset to watch this. I feel called out lol.
Thanks Rod!
Now I can explain it better and have a mental picture of how you explained it. Such a blessing!
Thank you, Crissy. That's the best thing any instructor can hear other than the phrase, "I like to use a lot of right rudder." :)
Best,
Rod
THANK YOU! Fantastic video perfectly explained a concept I was having an issue with.
Thank you, Rod. I love your videos and humour.
Thanks!! Perfectly explained
Thank you!! I couldn't make sense of it before your explanation, and I was so frustrated 🙏
You are most welcome.
Rob this is so interesting. Thanks for your videos.
My pleasure, Migdez.
Amazing video!
Great explanation
very clear!! I had to watch the second time with one finger in my right ear so that the information wont come out there.
Rod machado, Greetings from Peru, i saw many videos of Va, and let me tell you, you are the only one that knows how to explain it, you make a " tricky and hard to explain" term as Va , easy to understand, ... a good instructor said to me if you can not explain it simple is because you did not understood well.
U r a stud thank u
Hello Rod ! How do we know what the angle of attack is at each speed? Is it a fixed value regardless of aircraft?
For most airplanes, the angle of attack at cruise speed is about 3-4 degrees (the angle of incidence). From there, you can make the calculations shown in this video.
Best,
Rod
Hello Rob 👋🏻 Why does a gust increase AOA? A horizontal gust increases or decreases my IAS speed (depending of the direction) and a vertical gust lifts or pushes the entire airplane down. Why does a gust increase my AOA as long as i hold the same pitch attitude?
I understand, that the speed increases of a horizontal guest will increase IAS and therefore lift and g-load and a vertical gust increases g-load by pushing the plane upwards, but how and why the change in AOA?
Correct me if im wrong people but I believe it's because it generates a new component between the airplane flight path and the relative wind. It won't be ''that straight'' anymore as before the gust.
Oh shoot almost forgot to take my finger off my ear! Thanks!
lmao ahaha love the plane illustration at 6Gs, even the N610 etc went off the plane hahhaha
Im not sure if it is correct that AOA doubling produces double the lift eg on a NACA 2412 AOA of 2 degrees has CL of 0.625 and if you double AOA to 4 degrees the CL goes up to 0.744 . All other parts of lift formula stay the same ie 1/2rho, V^2 ans S . Perhaps i'm mistaken ?
Greetings Hedley:
For these examples, I took the average CL between the NACA 23012 and NACA 65-415 airfoils that are common with many general aviation airplanes. The coefficient of lift vs angle of attack graph on these airfoils closely represents a constant increase in value with a doubling of the angle of attack. In other words, the coefficient of lift increases at an approximate .39 per 4-degree angle-of-attack change up to CLMax. Now, if you want to glance through Abbott’s theory of wing sections, you’re sure to find many exotic airfoils with a much different CL/AA relationship. My video, however, is about the airplanes most pilots fly.
Best,
Rod Machado
@@Flight-Instructor Thanks for reply . I have been doing some accelerated stall training in my plane hence the interest . Plane is Pioneer 300 Hawk , and I have a Falcomposite Furio with a laminar flow airfoil NACA 64210 with some washout near the tips. The C208 is far more docile but far bigger . Good health and thanks for your videos.
@@hedleyfurio You are most welcome. If you have an AA vs Cl plot for that airfoil, I'd love to see it (rod@rodmachado.com).
Best,
Rod
I’ll send plots through tomorrow . It’s late here in South Africa . After recent training exploring outer edges on the Vn diagram , I wish I had done this after 100 hours and not after 1000 . It was a real wake-up and our CAA should include this in licence renewal requirements . I became complacent and mistook logbook hours for experience . Then placed in unusual attitude and after the ‘ startle effect ‘ had no clue what to do , so tried to pick up dropped wing with aileron 🥴. At 65 I’ll have to try and reconfigure muscle memory 😂
Hey, so Va is the same as Vno?
Absolutely not. They are not the same thing at all.
Rod Machado wow thanks for responding even 4 years after putting out this video. I think I am mixing things up. They only taught me red line (Vne), yellow arc (Vno) and green arc. This video was a great explanation, have to watch it again to really understand the difference.
@@miguelkamal256 My pleasure, MIguel.
I didn't know AoA was proportional to g-load...
Indeed it is, in the manner explained here.
AoA is proportional to Kg (Relief Load Factor) and Ude/Ve, so I think it is proportional, since these are related to Gusts Loads and Maneuvering Loads.
@@Flight-Instructor Wait What ??? no... Because you explain it this way doesn't make it a universal truth... The proportional correlation between CL and AOA is an approximation with all that it entails ;)
What is the difference between Va & Vo ?? 😭
Greetings Lee:
Va is calculated for an airplane at max gross weight. Vo is calculated for weights below max gross weight.
Best,
Rod
@@Flight-Instructor Thank you so much for the reply 🙏
I still cannot understand why the C-172’s using Va while DA42 is not, but Vo.
I’m taking Multi-Add on course & i cannot distinguish the difference of two of them.
Is there any reference i can read to distinguish the difference between Va & Vo, or can you please explain to me ?? 🥹
Greetings Leo:
The publishing of Vo numbers is a relatively recent thing. I believer it wasn't until the late 1980s that Vo began appearing in Approved Flight Manuals. However, just because Vo isn't listed in your POH, doesn't mean you can't calculate one for different weights. This would be wise since your airplane most often flies at weights lower than max gross weight.
Best,
Rod
@@Flight-Instructor thank you so much for the information :)