If you go to our RUclips home page you can browse the various playlists of videos we have. Just an fyi for future ease of use! But here it is: ruclips.net/video/czczVk0K3GQ/видео.htmlsi=wG9mtk7chdEdZc3g
To conceptualize surface friction, think of washing a dusty car. If you just pour water out of a hose onto the car, you will see a layer of flowing water but the dust mostly stays put. The dust isn't washed away because the water is flowing over a semi stagnant layer of water where the dust is at the surface of the car. Increasing the flow at the faucet doesn't help very much, but a pressure washer will do much better. However. using a scrub towel on the wet car will move that dust. The smoother the surface, the less drag because the drag layer is thinner and absorbs less energy. Minute surface irregularities will propagate disturbances out into the air stream in proportion to their size. The smoother the better.
To add when the aircraft comes outta painting there is much less skin friction drag. This type of drag correlates towards the drag you’d have with frost on the wings which would be significantly more skin friction.
Imagine sliding down a slippery slide. Your first attempt you slide right down no problem but the second attempt the slide is no longer flat and smooth. It has protruding bumps such that when you slide down you are constantly slowed or even getting stuck on these bumps. This is what’s happening at the microscopic level to air molecules that pass over the wing. Tiny imperfections in the wings surface make it not all that smooth to the perspective of an air molecule such that they get caught or stuck in the bumps and holes as they travel over it. This slows the aircraft because all these tiny little molecules getting stuck creates a small force in the opposite direction of motion while in flight
Not sure what you mean by "any streams of aircraft" But yes I am a Private Pilot as well as a Certified Ground Instructor. I also have a Bachelors and Masters in Aerospace Engineering with 8 years experience as a Flight Test Engineer
@@PartTimePilot okay sir......I am studying to become AME in Tamilnadu, India You are doing great work..... making students like us to understand concepts easily......Stay healthy and stay blessed
Another great video! Could you please provide a link to your video on induced drag as mentioned at the end of this video?
If you go to our RUclips home page you can browse the various playlists of videos we have. Just an fyi for future ease of use!
But here it is:
ruclips.net/video/czczVk0K3GQ/видео.htmlsi=wG9mtk7chdEdZc3g
To conceptualize surface friction, think of washing a dusty car. If you just pour water out of a hose onto the car, you will see a layer of flowing water but the dust mostly stays put. The dust isn't washed away because the water is flowing over a semi stagnant layer of water where the dust is at the surface of the car. Increasing the flow at the faucet doesn't help very much, but a pressure washer will do much better. However. using a scrub towel on the wet car will move that dust. The smoother the surface, the less drag because the drag layer is thinner and absorbs less energy. Minute surface irregularities will propagate disturbances out into the air stream in proportion to their size. The smoother the better.
I like this metaphor!
Thanx bro now I understand about drag
Anytime. Thanks for watching!
Thank you for making this video.......
My pleasure! Thanks for watching
When you are a cfi with a private candidate, you don’t need to go that much in depth but there are other challenges you’ll face.
To add when the aircraft comes outta painting there is much less skin friction drag. This type of drag correlates towards the drag you’d have with frost on the wings which would be significantly more skin friction.
@@alessio272 Good info!
thank you for this video
Nicely explained
Thanks!
great video!
Thanks for watching!
can you please give me an example of skin friction drag
Imagine sliding down a slippery slide. Your first attempt you slide right down no problem but the second attempt the slide is no longer flat and smooth. It has protruding bumps such that when you slide down you are constantly slowed or even getting stuck on these bumps.
This is what’s happening at the microscopic level to air molecules that pass over the wing. Tiny imperfections in the wings surface make it not all that smooth to the perspective of an air molecule such that they get caught or stuck in the bumps and holes as they travel over it. This slows the aircraft because all these tiny little molecules getting stuck creates a small force in the opposite direction of motion while in flight
@@PartTimePilot that was good explanation thank you so much for your time appreciate that 👍.
You’re welcome. Thanks for watching!
Keep it up! 👍🏻
Are you working in any streams of Aircraft ???.....Are u a pilot??
Not sure what you mean by "any streams of aircraft" But yes I am a Private Pilot as well as a Certified Ground Instructor. I also have a Bachelors and Masters in Aerospace Engineering with 8 years experience as a Flight Test Engineer
@@PartTimePilot okay sir......I am studying to become AME in Tamilnadu, India
You are doing great work..... making students like us to understand concepts easily......Stay healthy and stay blessed
@@ithunammakaga2366 thank you and thank you for watching!
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