Glider Ground Effect Demonstration
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- เผยแพร่เมื่อ 1 พ.ย. 2017
- It is simply mind boggling how far a glider can fly low to the ground and stay in what is called ground effect. Ground effect is simply flying very near the ground (under one wingspan from the dirt) and magically the lift is increased and drag is decreased. If you want to know why, do a google search. :) Haha. The net effect is it seems like the glider can just keep gliding right over the ground forever. In this video the glider flew over a mile in ground effect and only lost 5 miles per hour. Please do not try to fly like this or try to recreate this experiment. It is very easy to touch down too fast (I came very close!) or overshoot the end of the runway and then not have enough energy to pull up safely and turn back and land. You will notice that I started at around 74 knots well beyond the airport property and was still flying at 70 knots indicated airspeed and only had 3000 feet till the end of the runway to slow down, land, and stop. I pulled back on the stick to climb to a safer (but still pretty low) altitude to adjust flaps and pull spoilers to decrease airspeed. You NEVER want to adjust flaps or open spoilers close to the runway in ground effect. The whole process of getting the aircraft into normal landing configuration was very quick in this video, and had I messed it up, it could have been very bad. I hope this is a good disclaimer to NOT try to imitate things you see online in your own flying. Conditions, pilot experience, locations, and equipment are always unique and I tend to get quiet when I have a lot going on and I don't say everything that I am thinking or considering. I want lots of people to become interested in gliders and soaring but not get hurt or worse. Be safe up there. Cheers, Bruno - 85W - I mean B4 :)
- กีฬา
I see pelicans doing this over the waves sometimes it's incredible how how far they go without flapping once. Sweet demo!
I saw flying fishes gliding over sea for 20-30 meters without flapping anything, I thought I was dreaming.
Pelicans use ground effect and a phenomenon called dynamic soaring. When you see them pull up and turn into the wind before heading back down between the waves, they are gaining a very slight amount of total airspeed due to the different wind speeds in between the waves and at the wave crest where the air is being compressed. You should check it out if that kind of thing interests you. Rc glider flyers have managed to break the 500mph barrier using similar techniques but on mountain tops instead of ocean waves.
@Michael Nickname Yep. The real max airspeed number is actually higher than that but the point at which they take the reading is the slowest part of the circuit. The formula they came up with for calculating the max speed from the reading on the radar gun should put it between 560 and 600mph. The guys doing this are at the top of their game in regards to flight skills, building skills and aerospace engineering ability. th-cam.com/video/nv7-YM4wno8/w-d-xo.html
@@shmaknapublar thats right, there are some good clips on Ytube of the RC gliders doing this. I fly RC slope, used to fly RC helis and powered planes...which were great fun...but RC gliding is in a different league:)
I love seeing my favourite TH-camrs in the comment sections of quality videos deep in the recommendations well
Ground effect is where the air below the wing is compressed and creates lift. It happens within the height of the wingspan.
Correct explanation, no effect on drag.
Real engineering made a great vid about this
K S thats not correct. Induced drag is reduced in Ground effect.
It does however effect induced drag
The air is not compressed. Compressibility of air is negligible under mach 0.3. Lift in increased and induced drag is decreased because of the proximity of the ground.
I was 40 years old, learning with a experienced instructor in an aluminium glider made in Chekoslovaquia ( Blanik) . I was aproching final and he talked to me and made me rest some time away from the landing field. Before the landing field there was a wired fence for cows ( in Bahia Blanca, Argentina ) . He then asked me if I think that we will managed to arrive with enough altitude to surpass the fence... I told him that I thought we would NOT ... He told me to try my best, and I did it. We flyed up to where the fence was and we were already beneath (the fence is 1,20 meters high). So we were flying less than that ( may be 0,70 meter.) I kept cool, knowing he was teaching something I didn't know. Just before the wire fence he said " just skip the fence and get down again" and we did it !!! ( I was absolutly astonished, gratefull
and very happy to learn in practice this theory.) Now I am 74 ...
Here we are, back with another episode of why the hell is this in my raccomendations!
Same
Yes, but that's cool
Lmaook
Because you watch and comment. TH-cam's bot sees this a recommends again. 😉
Sand +ä
That caterpillar on the windshield really held on for its life
Its a small cord
@@sebdan3992 dont talk shit
@@sebdan3992 its a running joke for years amd you ruined it
Lmao😂😂😂
damn glider jokes
0:31 Hate it when that happens
Yeah that seemed kinda sketch
what does it mean "I flew 85W..." i'm not a native English speaker)
@@alexaxel504 85W is the callsign (let's say, the name) of another glider he flew a while ago...
Ground effect is because the high pressure air created under the wings is sitting against the ground, creating a cushion :o)
RetroGamerVX it’s because the extra high pressure air caused by the air bouncing off the ground and striking lower surface of the wing, adds to the pressure differential between the upper and lower surface. Ie greater static pressure (on a surface) below. It’s not the cushion itself because weight is still acting downwards so it’s always explained by the differential.
No room for tip vortices.
Lol
Ground effect has nothing to do with a cushion of air. There is less drag due to WTV's being cancelled out by the ground below reducing drag. This is why airlines started adding Wing tip generators. They effectively reduce drag on the linear axis of the wing root allowing a more efficient wing
K. Bierman
Oh dear, quick lesson on aerodynamics.
The glider flies by accelerating an Ovid cylinder of air roughly equal to 1.4 times the wingspan.
This mass of air has the downwards momentum of the time the glider was in it, plus the wasted energy of the tip vortices.
Now, ground effect.
Close to the ground the air cannot gain a downwards velocity so the energy that accelerated the air down is no longer lost, plus the diameter of the tip vortices is reduced from the 1.4 span effective area.
So, saying the air under the wing (and more so in front of the wing) is somewhat accurate as it has the force of the gliders weight acting on one side and the ground pushing back on the other side instead of free moment.
Over water we call it the wave effect. a good way to beat radar and conserve fuel by allied bomber's in WW2.
Superb demo
I saw competition pilots use this effect to approach the field, running low at high speed from 2 or even 3 miles out the runway. Very beautiful, but sometimes not so funny...
Jose Marmontel these finishes were discontinued for being too dangerous. There were fatalities, including among the spectators, who often gathered in front of the finish line to observe and take photos of the low flying gliders.
-Northern California, waiting for my 'ride', as landing glider was in G.E. too long. It raised tail, slid on skid, hit the restraint barrier chain link fence, damaging wing, far beyond end of runway. "No ride for you"... ;
I used to fly a Schweizer SGS 2-32 many years ago. Your aircraft has a glide ratio we could only dream about!
Great video, thanks for posting it, that really takes me back.
I am training on that aircraft currently.
Amazing!!! and the guy applauding for you at the end of the runway is the icing on the cake!!!
Awesome save with the landing gear!! 2:37
I've been binge-watching your videos and the way you handled and control your girl is damn impressive! 99% of people who drive are nowhere near 'as one' with their cars as you are with her. It is a pleasure to watch.
Soviet Union build huge aircraft on this effect, as far as I remember, they fly in 10-30m above ground or sea and lift amazing amounts of cargo.
Ekranoplan or Caspian Sea Monster
torbinzix1 “Ekran” in russian is a “screen”
@@torbinzix1 they also made the lun class ekranplan that is armed with with sunburn anti ship missiles
In Soviet Russia, ground effects YOU!
Thank you. I wasn't looking for this kind of video but it was a random pop up in my feed and was very enjoyable to watch. I am now looking for a glider flight near me.
Some rainy day when you want to go for an hour-long flight while sitting in your living room, grab a drink and a snack, enter THIS pilot's name in your search bar, and pick one of his flights to stream to your TV. Some may find it boring, but I find it exhilarating. He slides through the sky riding lift from ridge to ridge, and covers hundreds of miles. There is no crash, no burst of flames, and no accompanying music, just the raw experience of glider flight in the amazing Rocky Mountains. The beeping of his barometer is an emotional thing, triggeringbexcitement when chirping a high tone and concern when making a low tone. It sounds out if the glider is rising or sinking. On a good TV , you can see the gauge at the upper left of his dashboard, which also shows graphically his rate of climb or descent.
@@logmeindangit I've been there for a few days. Random video, now contemplating a demo ride and getting licensed. Club 30 min away. Had no idea flights could go so long, so high. Tonight searching for solutions for a full bladder...lol
Much, much more intense than I expected - Awesome!!
Outstanding gliding technique I must say sir, the aproaching to the runway was so smooth. You could land the moon!! Greetings from Catalunya!
Nobody can land the moon with a glider. Nobody did land the moon anyway. Ever.
Birds skimming the water is the best demonstration of this effect.
Mate, stumbled across this and must say I thoroughly enjoyed the banter, tho most of all, nothing on a 2D screen has EVER made me feel that feeling, like I was Landing again.
*Thank you*
That was nuts :D loved seeing that low fast approach . . . what a blast
Very cool. I had no idea of this effect, and how it plays out in reality. And while I'm not anyone trained in any sort of flying business, I find it very enjoyable to watch a video of someone doing something that they're obviously very good at.
Oh boy... I'm so looking forward to learning to fly next year. Great videos, Bruno!
How is it going now??
Bruno, would you shoot a short video looking along the wing trailing edge showing what each of the flap positions looks like? I'm kind of wondering if 1 and 2 are reflex and just how deep landing flaps are.
That’s nutz how efficient that glider is in ground effect! 👍 Cool demo.
There really is a ground effect! I knew it!!......LOL. Great demo Bruno. Thanks for bring us along again!
That is pretty amazing. I thought you were going to run on a dirt runway because you were so low already, and without lowering landing gear.
this is why they built the ekranoplanes... right?
@@user-mv6mw8rm5g да абсолютно!
@M. Vendel commies.
@M. Vendel Communists. From the Soviet Union.
Great demonstration! A friend of mind found out the hard way, he came in to land too fast (in a Schweizer 2-22) and he flew over the whole landing strip until he pulled up at the end of the strip, stalled and fell like a flyswatter.
Amazing demonstration, nothing better than practice
ground effect is a long nice cruise into a short stall
I think ground effect is a cushion of high pressure air formed between the wing and the ground. The wing itself has the same drag, but induced drag is lowered.
I scrolled down to see if someone explained this properly and this is it, to see the effect vividly google Ekranoplan th-cam.com/video/V8Nu94khHoo/w-d-xo.html
2:36 the magic begins. That is so sick haha. Nice demonstration man!
I flew out of Estrella SSE of Phoenix and LOVED practicing high speed low approaches. Turning base and final from 10 - 15’ off the deck at high speed. I was flying a Grob 103 (57.5’ wingspan) so you would have to pop up to make the turns and then push it back to the deck. Serious fun.
It was my understanding, that ground effect is created when the wings are close to the ground, they create a high-pressure Zone using the ground to push back a force to the wings, making them more efficient compared to open air.
Nope ground interrupts wingtip vortex that causes induced drag to be reduced.
@@SVSky interesting...🤔 but I will look into it. I would compare it to how a dolphin surfs a bow wave.
You should have titled the video "Ground effect, with NEAR MIDAIR FENCE COLLISION !" :P
Haha - I knew it was there. Thank goodness because it was hard to see so I was glad to be looking for it. Thanks for watching.
Subscribe me
Great demo. Ground effect is a beautiful way to maximize flight efficency.
Bruno, you make me envious every video
See ground effect wiki for more detail. "This is caused primarily by the ground interrupting the wingtip vortices and downwash behind the wing. "
lol
You were the pilot in command and you refer to ground effect as magical. You know downdrafts and micro bursts are just angels farting.
Really? If an angel farted it would blow you out of the sky. People underestimate angels!
You are without doubt a great glider pilot.
This is great! Thank you. One thing though: ground effects are not a reduction in drag. The air flowing between the wing and the ground flows according to the Venturi effect, increasing air pressure under the wing. That's what lets you float.
When the floor is lava and the glider knows it.
"That was fun" aka that was close to dragging a wing into a light pole!
Very cool. You're very lucky to be able to fly in such a beautiful place.
With only metres left. Well done. Good demo.
i have some flight time in a mooney. exceptional airplane but due to the ultra efficient wing, they just dont want to land. there is some technique involved to land in a reasonably short distance. they get into ground effect and want to keep flying.
EZ VIBE is it just me or do gliders scare the shit out of other power driven A/C pilots?
EZ VIBE also, I would be interested to hear about the technique required to get that Mooney on the ground☺️
Thank you for sharing your experience! :)
@@adamey5935 Get the aircraft into reversed command flight when on the final leg; that is, nose high, high power setting slow flight. Reduce power and slowly pull up to lower speed until you both lose speed and altitude. At this point you're in reversed command. Add power to maintain your desired sink rate and watchout your speed, you don't want to stall.. Regulate speed with elevator input and sink rate with engine rpm (power).
just to clarify...there is a technique to landing in a reasonable distance, but i never got it. lol
Can you calculate the reduction in induced drag in ground effect? The ASW 27B will do a 48:1 glide at altitude, but in ground effect with, maybe a 10% reduction in drag...53:1 ? For those who might not appreciate the performance of these sailplanes, that runway is 6300' long! Great demo Bruno, thanks
George Dyer knocks out trailing vortex drag (induced by lift generation from wings)
Easy to calculate if you know the height above the ground relative to the wingspan. At a height of half a span above the ground the induced drag is reduced by about 8%. At a quarter of the wingspan it is reduced by about 20%.
Wow that was a good demo. Thumbs up. 👍👍
Nice clean smooth runway. Very fast
Years ago, Boeing had a huge cargo plane on paper, perhaps even built a prototype, called the Pelican that flew on this principle. The intent would have been to move many tons of freight over the ocean,
flying twenty feet or so over the water in a huge plane that would require very little fuel, with a range of many thousands of miles.
Wasn’t that a Soviet experimental plane? Think it was called the Caspian Sea Monster.
That was an old soviet design to carry troops, tanks and perhaps even short-mid range nuclear weapons to American shores, you can still see one of the devices sitting in a yard near Moscow, rotting away...
It was a failed experiment.
@Kade Roder I meant that Soviet ship was a failure and never entered service.
I remember an article in Popular Mechanics about the Boeing project. They usually design them to fly at higher altitude to cross land and other obstacles.
Perfect stop though, good call stopping when you did.
That was fun! I know virtually nothing about gliding but i feel like I learned something here!
One of my favorite videos!
Great demo. I understand well how ground effect works. Same for Helicopters. But I am curious about your saying drag is reduced during ground effect. Perhaps I should google as you suggest. :)
Edit. Just googled it. So much for my comment "I understand well.." LOL. So much more to it. I soooo love physics. :)
Drag will be reduced. You need less AoA to maintain lift to staying in air. This reduces the drag. Of this reason the ekranoplanes were inventet . Look in Google vor russian Caspic Monster .
Great demo. Cool shadow at 1:47. I was about to correct you: You said ground effect decreases drag. I always thought it increased lift. Some online research tells me that it does both. It decreases wingtip vortex and lowers the angle of attack of the wings slightly. I guess I'm a bit of an aerodynamics nerd.
Scott Gaul Yes you are and we're grateful for it.
When an aircraft is flying at load factor 1 (unaccelerated flight, as in not manuevering) the lift produced is always equal to the weight of the aircraft times the cosine of the flight path angle. Flying level in ground effect you have exactly the same quantity of lift as you would at 1000 feet, with considerably less induced drag.
The actual physics concerning ground effect are quite simple: Above the wing is a low pressure area, below the wing is a relative high pressure area. What happens in flight is that the air will want to move from the bottom to the top over the wings edges. This is why you see vortices around the wing tips. It is also why planes have winglets at the wingtips. To prevent this air from rolling from underneath over the wingtip to the top. Whenever you get close to the ground, this rolling motion is interupted by the ground, therefor acting as a sort of winglet. So no, you're not decreasing drag, you are increasing lift, which makes you put more downrudder in to maintain altitude, therefor maintaining a lot of your speed. I'm oversimplifying this effect, but in a nutshell that's how it works.
Flyingdutchy33 the wing in ground effect doesn't produce more lift. If it did, the glider would accelerate away from the ground. This is a fundamental topic: if we are flying level, we are always producing exactly the same amount of lift regardless of speed, altitude, etc.
I read it also squishes wingtip vortices making them actually bare against the surface and create lift
That's amazing. Great demo - thanks
Thank you Bruno for this informative video. I was surprised at the distance you glided at that low altitude. I thought for sure you would touch down short of the runway threshold .
Just shows you how amazing modern sailplanes (gliders) really are! I had so much confidence in what the ship will do that I was willing to put my butt on the line to show you. Go take a glider ride and see for yourself. You will be amazed! :) Thanks for watching.
The higher the ratio between the induced drag and the parasite drag, the more helps the ground effekt. When a glider ist flying fast, he has a low ratio between the induced drag and the parasite drag, so ground effekt can't helb very much. I think the main reason for your 'ground effekt' is the updraft of warm air above the hot runway and only a little bit of the real ground-effect.
Can you repeat the same experiment at a time, when the runway has exact the same temperature as the environment? Perhaps at 7 o clock in the morning or so?
I was just thinking the same thing
It would work even better with the cold dense air providing more of a cushion/layer between the airfoil and the ground.
Please do a vid about the funny hat all of the glider pilots wear!
@juggliar A skull cap would be useless and a sombrero would be overkill.
We all own one, i think gliding reduces your dress sense if I’m being honest
Right? It's everywhere, yet I've never seen any comments on it
Loved doing this in the IS28-b2 and hornet206 very long high speed run up the field to the hangar, 30 foot incline over 1 mile, was always the highlight of a long days flying.
Ekranoplan fly that way
“Lower drag” wth lol
Great video! I’m doing all of my flight training out of Provo! See you in the skies! Safe flight!
On a side note - The legend goes that the Buccaneer can actually ride on its own shock wave at low level, and naturally stays at the height where the pressure from the wave counteracts any tendency to drop lower - this ground effect was about 18 ft and it became the operational height for interdiction at over 600 knots.
A USN admiral who had encountered the Buccaneer during joint Nato naval exercises previously and remembered the welcome they got as the USN fleet came into British waters. A flight of 4 Buccaneers went out as a welcoming party and requested permission to do a fly by "over" the US carrier.
Permission granted, nothing airborne over the carrier, all clear, now fly bys were usually a tight formation pass over the ship or fleet, not this time, the four ship Buccs split to send one down each side of the carrier at deck height, the other two straight along the flight deck at very low level and high speed and if accounts are correct, one did the pass inverted.
And when you apply this to the undertray of a race car, you get crazy downforce with virtually no drag penalty!
Ferrariman601
Ferrari..Eh?
F1
Wrong. If this happens to a racecar they take off towards the sky, do some fancy flips and crash in a very bad way. In a race car, u want the complete oposite of this effect - Not a cushion of air on which you can ride, but a low pressure area, close to a vacuum, to suck you on the ground generating douwnforce and grip.
The Lotus T79 used ground effect to create more downforce.
It has the same name, but they're different concepts.
@@spookyshark632 Correct, the ground effects in the Lotus utilized the low pressure under the car and accelerated the air flow in order to increase suction towards the ground.
Not someone on the ground to take video, that would be a good comparison.
That was beautiful, thanks for sharing!
That was too cool !!! Thanks for sharing.
Quelqu'un peut m'expliquer svp ?
En gros il nous montre « l’effet de sol ».
Mais si tu n’as jamais piloté un tout petit peu tu ne peut pas vraiment comprendre...
Alexis Beuve Ducoup c'est supposé montrer quoi ?
illyonka que la portance augmente et que la traînée diminue.
La portance c’est la force qui pousse l’aile vers le haut
La traînée c’est ce qui freine ton avions ou ta voiture
Alexis Beuve Ah ok merci :)
@@alexisbeuve8199 Portance, c’est “lift” et traînée, c’est “drag”, n’est-ce-pas? Je ne savais pas les mots en Français. Merci!
This is what also happens when a playing card is dropped flat on a flat table. Maybe an inch or so. I guess
Many years ago for my birthday a friend gave me a $50 gift certificate for a tandem flight, at llano ca.
It was great, it sounded like we were a jet instead of a prop job, the instructor said do you want to do a loop, and without hesitation said sure he said watch the G- meter in front of me, we pulled 4.9 G's .. I could almost imagine now how military fighter pilots must feel, then the landing was scary because he came in just like this guy scrapping buts as I felt! I never never been that close to the ground on a landing ,and I hoped this guy knew what he was doing!
Loved the experience!
So I purchased a gift certificate for my dad and he loved the shit out of it!
This is a bucket list thing , do it if you can!
I've also skydived 30 times in California City!
You are so helpful in your teachings
You really shouldn't be wearing your dive watch, when flying ; )
Haha - I need to know the time every once in a while. ;)
Rolex Submariner or Deepsea?
@@randy3228 he no answerin
It's not less drag, it's more lift.
Joe Matthews can’t tell if you’re joking or not.
How is it more lift if he is constantly floating and not flying? The cushion of air underneath the wings exert high pressure,so there's less drag.
Tasin Al-Hassan there is no cushion of air. It’s the wingtip vortices being disturbed and not allowed to progress and develop that is happening here. It’s only a decrease in drag.
+@@SidestickPilot Can you show me a diagram or anything that'll help me visualise this?
Tasin Al-Hassan google or TH-cam Bold Method ground effect. Bold method explains everything very well they have diagrams and short videos to show the decrease in drag due to disturbance of the WTV’s.
What great landing! Thanks Bruno :)
Tu m'as fait rêver, je vais rêver planeur cette nuit :)merci pour cette vid.
Нихрена не понял что произошло
perfect...real perfect
why do people enjoy nonsense like football when such stuff exist.??
Yeah...higher order of thinking when you know kicking and throwing a bag of air is wasteful to watch. Don’t get me wrong...I still like a good competitive football game but let’s not leave our brain to waste on fanatical TV games
Brian Xavier because football is easy to join whereas gliding requires more skill. Not saying that football requires no skill just the entry level of skill required for is gliding is much greater that foorball
You can enjoy both...
Brian Xavier To answer your question...... people who love to live life to the fullest do this...... glider flying. I did it years ago.
I'm getting back into the saddle at a nice young/old age. Nothing like it!!
Brian Xavier Luckily there are useful sports like soccer too.
Hey Bruno great vids. When are you going to demo a wave?
Nice tutorial! Now let me just jump into my jet really quick and try this!
Можешь не искать, русских коментов тут нет
Блин я искал ,не Русских даже а Башкирских)));)билат был кайда оса ,тормозга бас исер)))я так мысли в слух)):)
Нашел
Blyat
А в чем прикол? Не понял, это он про градиент ветра чтоли?
Ой не пи3ди , да
Am I a nerd if I think that's cool?
Cool video, Bruno, thanks! Gliders, so quiet, no vibration, don't have to yell 'Clear!' before take off. BTW, some people claim that Howard Hughes' 'Spruce Goose' never flew above ground effect during it's one flight.
Wow. I haven't flown for a number of years but i would NEVER have been that low for the runway on final and then to run that far down was insane. I have felt ground effect but never to that degree. That was super
Terrible landing 1/10
Sorry i just wanted to be mean
Nice dem)
You were hauling balls. That was sweet!
Nephi Airforce showing its chops. Nice job.
I was recommended this because I watched a gyroscopes video, I was recommended the gyroscopes video because I looked up a gyroscope mod on youtube for Space Engineers.
I am very intrigued by both videos either way.
Good demostration.
it looks dangerous, cool and amazing!
Just wondering early in the ground effect could you have pulled up and come back around again, or wouldn't you have enough energy?
Awesome landing !
Cool demonstration :)
Great vid. What was your approach speed? That was a shallow angle when you turned on finals!
Good that you had the speed to pop up and deploy the wheel ... I guess you were really close the ground! Hey, maybe you can answer a question I've not found the answer to. When do you raise the wheel on take-off? Do you wait until you release from tow, or do you do it earlier? So far the two gliders I've flow have fixed wheels (still call "wheels" on my landing checklist, of course).
Hey Bruno!
Fantastic demonstration! You are an awesome aviator.
Watch the fence though. That was a close call.
This ASW of yours is really something!
What is 85W though?
Haha - I flew 85W a few weeks before when our club was doing a winch demonstration to a bunch of local EAA pilots. I flew 13 flights off the winch taking various pilots for rides. I guess I got used to saying 85W. Guess I was focused on other things trying to make sure I didn't kill myself. Cheers.
The wash that goes over the trailing edge of the wing is deflected by the presence of the ground effectively reducing the angle of attack which naturally reduces induced drag. That is what ground effect does. I had to explain this in depth for my CFI check ride.
Hi Bruno What is your ICAO home base airfield? Btw perfect demo of performance glider
I have a video on my channel demonstrating the Schweitzer 1-26 in ground effect. Despite being a low performing stubby little thing, it floats like a hovercraft in ground effect.
That was freakin awesome !☺
What was the flap configuration over the runway?