aviation_physics aviation_physics

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AP โ€ข Aviation Enthusiast  I explain stuff about aviation! - Post descriptions are written by me - Spotting, videos, and reposts (and the occasional drawing of mine) ๐Ÿ‘Œโœˆ๏ธ

Engine startups.
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Awesome cold start footage: Peter Schnuler...? Canโ€™t quite make it out
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So plane engines are big. It takes a ton of energy to get them started up, and certain conditions are necessary for them to be able to start up. There are also several ways to start them up.
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Before an engine can start producing thrust, it needs to be rotating at a decent speed (10-30% of max rpms) in order to avoid premature combustion due to lack of airflow. This early combustion can cause the engine core to overheat and damage itself.
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The first and most common way for commercial aircraft engine startups is startup via APU exhaust. The Auxiliary Power Unit, APU, is a generator that usually produces electricity for the aircraft. The APU also doubles as an engine starter as its routed exhaust is more than enough to spin a turbine up to combustion speed.
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Another commonly used startup method is a cross-bleed startup, meaning one engine is already running and bleed air from that engine is routed to start the second engine. -
And the third frequently used startup method is a pressurized air-based startup via a โ€˜start cartโ€™, a towable pressurizer that routes pressurized air into the engine turbines to get it up to combustion velocity.
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#coldstart #aviationdaily #avlover #planespotting #aviation #enginestartup #poweplant #startup #airplane #videooftheday #postoftheweek #avgeeks #aviation_daily #planespotting #aviationphysics #av #avlover #boeing #737 #delta

Itโ€™s been a while since Iโ€™ve posted art on here!
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For those who didnโ€™t join the stream this is a piece Iโ€™ve been working on recently for myself! ((I like dreamliners just in case you werenโ€™t aware lol))
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Anyway I saw China Southernโ€™s livery with the Dream and fell in love. (They also received the 787th 787 lol)
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This is my artwork! Please do not repost without the proper credit.
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#aviationdaily #avlover #planespotting #chinasouthern #art #aviationart #av #787 #b787 #dreamliner #myart #copics #copicmarkers #plane #planes #wingflex #airplane #โœˆ๏ธ

STUNNING 787 shot by @matdouhaire ๐Ÿ‘
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Such an awesome picture dude. The contrast between the light and shadow is perfect. ๐Ÿ‘Œ๐Ÿ‘Œ๐Ÿ‘Œ
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#repost #matdouhaire #aviationdaily #avlover #planespotting #787 #dreamliner #boeing #boeing787 #airfrance #av #plane #planes #b787 #aviation #aviationlovers #pastel #beautiful

Staring off the new year with a bang (hopefully)! Itโ€™s 2019 already! ๐ŸŽŠ
JATOs and JALs starring Fat Albert, the C-130 Hercules of the Blue Angels!
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๐Ÿ“น: Scott Guyette
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JATOs (Jet Assisted Takeoffs) and JALs (Jet Assisted Landings) are takeoffs and landings assisted with jets or small rocket-like propulsion thrusters that are attached to the fronts and backs of certain military aircraft.
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Generally both JATOs and JALs are reserved for very heavy airplanes on short runways.
A C-130 Hercules (that plane in the video) fully loaded with cargo or military personnel canโ€™t take off with 1500 feet of runway! Itโ€™s just too heavy. So the jets come in. They pack an additional punch and help the aircraft to take off or land at an acceptable rate.
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This method of propulsion is only used on military aircraft and is NOT used in commercial aviation, mostly because it can sometimes be unpredictable and erratic, as the rockets are an add-on and are more prone to failure than preexisting aircraft parts.
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However, this method is pretty safe and very effective. And it looks pretty darn awesome. โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”
โ•Please donโ€™t repost without credit to @aviation_physics AND the videographerโ•
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#c130 #hercules #c130hercules #fatalbert #jato #jal #jetassistedtakeoff #jetassist #blueangels #aviation #aviationlovers #aviator #aviationdaily #avlover #rocketassist #rocket #plane #airplane #flying #flight #fly #airshow #planespotting #2019

Happy New Year! ๐ŸŽŠ
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2019 is pretty much upon us! I have a bunch of personal goals and resolutions and I hope that 2019 will be a great year for everyone!
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#happynewyear #happynewyear2019 #aviation #aviationphysics #boeing #b737 #plane #airplane #flight #737 #737max #2019 โœˆ๏ธ

๐ŸŽ„๐ŸŽ„Merry Christmas everyone!๐ŸŽ„๐ŸŽ„
Reverse thrust!
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Awesome video by @mathilda.aviation โค๏ธ
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Sooo as you could imagine it takes a whole lot of energy to stop a 100,000 pound hunk of metal searing down the runway at 150 miles an hour. And the brakes that airplanes have help, but they donโ€™t provide quite the kick that planes need to slow down quickly and effectively. So in comes the thrust reverser. It does what it sounds like: it โ€˜reversesโ€™ the thrust of an airplane to aid the planeโ€™s deceleration while the plane is on the ground. By โ€˜reversesโ€™ I mean that thrust is diverted out of the back or bypass ducts of the engines in a direction thatโ€™s tangential (usually 120 degrees or more) to the normal thrust output.
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Aside from coming in varying sizes, reversers also come in different types.

Small business jets and MD-80-type airplanes usually have โ€˜bucketsโ€™ which serve as part of the engine cowling in normal flight but swing back on landing to divert thrust in a perpendicular fashion.
Larger jets, such as the 747 pictured here, have bypass-duct based systems. The engine appears to split in half during reverse thrust.
However, Airbus jets tend to have clam-shell reversers, where four reverser doors opened redirect bypass and core airflow.
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And theyโ€™re really loud.
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#aviation #aviation_photography #aviationphotography #747 #boeing #b747 #reversethrust #wingview #plane #merrychristmas #avgeek #megaplane

Thanks for 500+ guys!! ๐Ÿ˜ƒ So glad you peeps enjoy my stuff โค๏ธ
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Hereโ€™s a shot I took while at the @delta museum in Atlanta.
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#500 #500followers #aviation #747 #b747 #delta #deltaairlines #aviationphysics #avgeek #avlover #aviationpics #aviationdaily #boeing #thankyou

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VTOL and STOVL.
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๐Ÿ“น: Donato Maffin and Waiyan Tin, reposted from @militarymachine ๐Ÿ™Œ
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VTOL, which stands for Vertical Take-Off and Landing, is a functionality of some aircraft where the aircraft can perform complete vertical takeoff and landings thanks to either the use of rotor blades (helicopters) or the use of thrust vectoring (the plane pictured here, the F-35 Lighting II).
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While passenger planes are capable of โ€˜verticalโ€™ takeoffs, they can only perform vertical takeoffs (a normal takeoff with a very high angle of attack, close to 90) in certain atmospheric conditions.
However, passenger planes cannot perform true vertical takeoffs like a helicopter can. Commercial aircraft require a runway to get off the ground, no matter the conditions.
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While theyโ€™re not really seen in commercial use, VTOL and STOVL have unlimited capabilities for military utilization for many reasons.
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Fighters with STOVL (Short Take-off Vertical Landing) or VTOL capabilities can take off and land from virtually any size airstrip imaginable. This means smaller air bases, runways, aircraft carriers, and so on. Though fighters canโ€™t generally carry much of a payload and still be able to a true vertical takeoff. Instead they switch to a thrust-vectoring assisted short takeoff or are launched via a catapult. Itโ€™s still awesome to watch though.
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Cool stuff! (Explanation via @aviation_physics)
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#f35 #F35lightning #aviationlovers #aviation #aviationphysics #aviationgeek #avgeek #avnerd #usaf #airforce #fighterjet #fighter #lockheed #vtol #stovl #verticaltakeoff #verticallanding #planespotting #planespotters #plane #airplane #fly #flying #aviationdaily #โœˆ๏ธ

MICROBURSTS.
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๐Ÿ“ท: unknown, please dm me to claim!
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So this is an excellent photo of a microburst. A microburst is a very powerful downdraft of rotating air that can be wet or dry and can occur in rain or shine. (Basically the opposite of a tornado lol)
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These columns of rushing air are absolutely detrimental to an aircraftโ€™s ability to fly at low altitudes. When a microburst hits the ground, it rushes violently in all directions. An aircraft approaching a microburst is hit with an extreme headwind. This speeds up the aircraft rapidly, causing it to climb. Then the aircraft is blasted with a downdraft so severe that it can cause the plane to dive. Finally, the tailwind hits. Tailwinds have the ability to cripple a low-flying aircraft due to reduced lift over the wings. With these combined factors, planes flying near or into microbursts at low altitudes are prone to crashing.
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No reason to be alarmed, however; pilots are very well trained to handle microbursts and every commercial aircraft is equipped with sophisticated detection equipment to ensure that they donโ€™t fly into them in the first place.
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Interesting stuff! Comment a ๐Ÿ‘Œ if you read the whole thing lol
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Explanations are always 100% by me, @aviation_physics โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”โ€”
#aviation #aviationlovers #aviationdaily #southwest #airplane #airplanes #southwestair #microburst #plane #planespotting #planespotter #737 #boeing #b737 #boeing737 #thephysicsofflight #aviationphysics

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Concorde! One of only two supersonic commercial airliners to enter passenger service (for now ๐Ÿ˜)
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๐Ÿ“น: unknown, please dm me to claim!
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So Concorde was a supersonic, meaning it flew FAST. And it did, topping Mach 2.04, twice the speed of sound. In order to fly at this speed, Concorde needed to be very high where there was little air resistance. So it flew at a whopping 60,000 feet (18,300 m). Concorde could cross the Atlantic in just under three hours at that speed. Crazy.
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The Concorde was very well designed and was therefore well suited for both super and sub-sonic flight, thanks to its unique ogival delta wing. It provided good lift at subsonic speeds and great lift at supersonic speeds. Concorde was unique in the fact that it actually was a โ€˜taillessโ€™ design- meaning all of the pitch and roll fictions were operated by a control surface other than the tail plane. Concorde still did have a vertical stabilizer- but the fin was merely for stabilization and sometimes it assisted the ailerons in rolls using its rudder. But still, it is a โ€˜taillessโ€™ aircraft. Pretty cool stuff!
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Concorde was also one of the first commercial airliners to utilize fly-by-wire (electronically monitored) flight systems that controlled the engine thrust, autopilot, and control surfaces. The engines were state-of-the-art turbojet engines that were capable of maintaining supersonic speeds without using afterburners- which saved SO MUCH fuel. Because of that, Concorde was able to just barely complete a flight from New York to Paris with a full tank of fuel.
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Another thing with Concorde- the exterior of the aircraft got so hot during flight due to such high speeds that the airframe actually expanded mid-flight to compensate for the excessive heat. It expanded up to an entire foot during flight. Thatโ€™s CRAZY.
So yeah, Concorde. Frickin awesome.
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#concorde #aviationlovers #instaaviation #avgeek #avlover #avgeeks #aviators #aviation4u #aviationpics #aviationdaily #aviation #aviationphotography #bacconcorde #supersonic #jet #jets #fly #flight #plane #airplane #turbojet #aviationphysics

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De-icing and why itโ€™s hella important.
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๐Ÿ“น: @edot7
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So planes are designed to fly in both blazing and subzero temperatures. They actually have a harder time flying in hot temperatures because thereโ€™s less air on the ground, but freezing temperatures are just as cumbersome to deal with.
Planes depend on smooth, uninterrupted airflow over the wings, control surfaces, and fan blades to fly correctly. Any buildup of contamination on anything at all and the plane will have a very degraded ability to remain aloft. Contaminants can be anything from volcanic ash to sleet; but generally, contamination is snow or ice. So, in freezing temperatures, to delay or prevent the buildup of snow or ice on the exterior surfaces of the aircraft, the aircraft is routinely sprayed with anti-ice fluid before each flight. There are different chemicals that can be used; some are de-icing fluids that are designed to remove buildup of snow and ice, while others are anti-ice fluids that are formulated to prevent the buildup of future ice. The fluids really help; they prevent hundreds of crashes a day. If there werenโ€™t de-icing fluids, planes would be in big, freezing trouble. Cool stuff!
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Post descriptions are 100% original by @aviation_physics
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#megaplane #aviators #avgeek #avlover #avgeeks #aviation4u #aviationpics #aviationdaily #aviationphysics #deice #deicing #a380 #airbus #airbusa380 #thewhale #emirates #instaaviation #aviationlovers #aviationphotography #fly #flying #plane #planes #kingofthesky #dailyaviation #โœˆ๏ธ

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