I'm enjoying your instructional videos. I've been a fixed wing guy for a decade and the explanations you have are turning the light bulb on. Thanks for taking the time to do these.
Well Jacob, what can I say... You really have stolen the words from my mouth! Ha ha! Simply excellent ...! And thaks for the class... Gretings from Guatemala!!!
Jacob well done (this is no news) I'm posting extracts from my flight lesson. oh how I remember when it seemed I was unlearning as the hours accumulated. you videos are a great scientific explanation of the feedback my butt and back are telling me whilst flying.
Positive stall the air doesn’t seem to be too much below the chord line, but the retreating blade is so close in speed of the helicopter. Blade at tip spins at 200kts and heli goes 150. That’s only 50 knots over the airfoil.
Hi Jacob. I have cyclic and collective and principles of helicopter flight. They explain it well enough, but I have been unable to locate the five regions you speak of. Where did you find them? Thanks for your time and all of the videos-they're great.
Jacob thankyou for making these informative videos. it's a great help to all aviators. Can you please explain why resultant wind impacts from above Chord line in Regions B & C while the Pitch Angle is greatest at Root and Least at Tip? Shouldnt resultant airflow be impacting below chord line in all regions?
I can not explain how thankful I am for you making these videos! When I eventually have the funds, I plan on doing my PPL-H. I know you are a military pilot, but maybe you have some experience with this; Which course books are the best to buy to study the theory on my own? I noticed there are a lot of titles to choose from. Any recommendation I would greatly appreciate! I’m from Belgium, but I guess the theory is the same here, as it is in the usa?
Verdi. I glad the videos are helping out. I haven't gone through the process of a private helicopter school. I received all my training in the military and then did the my civilian equivalency ratings. If you're looking to just learn the basics in aerodynamics I'd recommend reading the Rotorcraft Flying Handbook - amzn.to/2ifPlnZ. If you've already got a basic understanding, and want to further your professional helicopter education with advanced helicopter concepts, I'd recommend reading Cyclic and Collective, by Shawn Coyle - amzn.to/2ifQGLx.
At 4:42 could you just draw the relative wind hitting the airfoil, but draw it upside down showing “lift” then when you flip over the page you see it’s creating “lift” but it’s downward lift.
That's cool and all, but how does that play out when you are flying the heli? What does having lower lift on one side mean? I don't see any heli's flying sideways just so, so how is flight effected? What does the pilot need to think about because of this? It is a great explanation (this and the shorter video you did), but I'm just curious about applications. -=80)
Helicopter designers compensate for this by allowing blades to flap. I believe he has a video on this already, so that might be a useful one to watch if you haven’t gotten an answer on that yet.
matas102. B and C represent different resultant airflows in relation to the chord line. While AOA may be different at different parts of the blade in the same relative position due to blade tapering, this diagram outlines the subtle differences in how the airflow strikes the airfoil. The biggest difference between B and C is that area B has more of a vertical downwards velocity due to induced flow velocity being greater than rotational velocity. This puts the airflow outside the critical angle. Area C is the point at which rotational velocity overcomes induced flow velocity enough for the airflow to intersect the airfoil inside the critical angle. Thanks for the question. I hope this helps.
Have you covered what is blade tapering in your past videos? I just searched for good explanation of it on the internet and I got some kind of idea what's going on. Is it worth a video about it? I find it confusing without your drawings. And thanks for the answer, very informative :))
man these videos are gonna get me through my private's license training, thanks for making these
I'm enjoying your instructional videos. I've been a fixed wing guy for a decade and the explanations you have are turning the light bulb on. Thanks for taking the time to do these.
Nice one again Jacob! Looking forward to watch your next video
Well Jacob, what can I say... You really have stolen the words from my mouth! Ha ha! Simply excellent ...!
And thaks for the class... Gretings from Guatemala!!!
I can smell that marker from here. Great videos man!
Jacob well done (this is no news) I'm posting extracts from my flight lesson.
oh how I remember when it seemed I was unlearning as the hours accumulated.
you videos are a great scientific explanation of the feedback my butt and back are telling me whilst flying.
Very informative. Thanks again Jacob!
Mark
Great breakdown!
Thank you sir! Great video and explanation! Fly safe.
Excellent videos. Thx u. Could you explain me what’s the reason for the vne reduction in increasing altitude.
Positive stall the air doesn’t seem to be too much below the chord line, but the retreating blade is so close in speed of the helicopter. Blade at tip spins at 200kts and heli goes 150. That’s only 50 knots over the airfoil.
Good vídeo ! 👍🏾🚁
Hi Jacob. I have cyclic and collective and principles of helicopter flight. They explain it well enough, but I have been unable to locate the five regions you speak of. Where did you find them? Thanks for your time and all of the videos-they're great.
Adam Hough. Those regions come from the Army Fundamentals of Flight manual. Thanks for the feedback!
Would that be the ideal nose pivot point?
Thanks, that answers many questions.
Jacob thankyou for making these informative videos. it's a great help to all aviators. Can you please explain why resultant wind impacts from above Chord line in Regions B & C while the Pitch Angle is greatest at Root and Least at Tip? Shouldnt resultant airflow be impacting below chord line in all regions?
I've never heard about B and C area. Could you explain this more?
I can not explain how thankful I am for you making these videos! When I eventually have the funds, I plan on doing my PPL-H. I know you are a military pilot, but maybe you have some experience with this; Which course books are the best to buy to study the theory on my own? I noticed there are a lot of titles to choose from. Any recommendation I would greatly appreciate! I’m from Belgium, but I guess the theory is the same here, as it is in the usa?
Verdi. I glad the videos are helping out. I haven't gone through the process of a private helicopter school. I received all my training in the military and then did the my civilian equivalency ratings. If you're looking to just learn the basics in aerodynamics I'd recommend reading the Rotorcraft Flying Handbook - amzn.to/2ifPlnZ. If you've already got a basic understanding, and want to further your professional helicopter education with advanced helicopter concepts, I'd recommend reading Cyclic and Collective, by Shawn Coyle - amzn.to/2ifQGLx.
Helicopter Lessons In 10 Minutes or Less I will look into it, thanks a lot!
At 4:42 could you just draw the relative wind hitting the airfoil, but draw it upside down showing “lift” then when you flip over the page you see it’s creating “lift” but it’s downward lift.
can you suggest me any video on blade element theory. thanks --student from India
That's cool and all, but how does that play out when you are flying the heli? What does having lower lift on one side mean? I don't see any heli's flying sideways just so, so how is flight effected? What does the pilot need to think about because of this? It is a great explanation (this and the shorter video you did), but I'm just curious about applications. -=80)
Helicopter designers compensate for this by allowing blades to flap. I believe he has a video on this already, so that might be a useful one to watch if you haven’t gotten an answer on that yet.
again, thanks
why does it go to critical AOA at B area?
I'd turn collective loose use pedals to rotate around that nose point.
Is that correct sir?
or else, why its differend AOA at B and C?
matas102. B and C represent different resultant airflows in relation to the chord line. While AOA may be different at different parts of the blade in the same relative position due to blade tapering, this diagram outlines the subtle differences in how the airflow strikes the airfoil. The biggest difference between B and C is that area B has more of a vertical downwards velocity due to induced flow velocity being greater than rotational velocity. This puts the airflow outside the critical angle. Area C is the point at which rotational velocity overcomes induced flow velocity enough for the airflow to intersect the airfoil inside the critical angle. Thanks for the question. I hope this helps.
Have you covered what is blade tapering in your past videos? I just searched for good explanation of it on the internet and I got some kind of idea what's going on. Is it worth a video about it? I find it confusing without your drawings.
And thanks for the answer, very informative :))
matas102. I haven't covered blade tapering but I'll look into it as a topic for a video. Thanks for the feedback!
Sir?