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Nairaland Forum / Nairaland / General / Travel / This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) (53532 Views)
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Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by 9gerian: 9:51am On Nov 16, 2018 |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by SouthEastFacts: 9:54am On Nov 16, 2018 |
nwanneni:Do you have comprehension problem. Op clearly explained that it is only during emergencies that fuels are dumped and dumping fuels leave a white trail. He is correct, even though this is rare. You don't land a plane that has exceeded it's maximum landing weight. There are other reasons planes dump fuel. Op just explained one situation. 1 Like |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by olawonder(m): 9:55am On Nov 16, 2018 |
Those trails are often seen when the plane is flying higher into the clouds, don’t look like something that’s about to land ke! I don’t accept this information o 1 Like |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by Bloggingscope: 9:56am On Nov 16, 2018 |
Drama is really happening here oooo Let me see how i can help |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by gcof(m): 9:56am On Nov 16, 2018 |
festyese:sense will not kill that your friend 1 Like
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Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by Kingjames(m): 10:00am On Nov 16, 2018 |
why not dump the pregnant woman as the biblical Jonah on his way to Tashis...instead of loosing so much money by dumping fuel... Our God is a merciful God that can position a fish and three days time she can go home .. 1 Like |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by IbrahimDamola: 10:04am On Nov 16, 2018 |
cyclops: Is it with this your empty skull that I'm going to come record track with you. You dumb no be small. 1 Like |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by pansophist(m): 10:06am On Nov 16, 2018 |
Nonsense. It's called chemtrails, or contrails or whatever, but not fuel dumping. Ask yourself the question. If the airline still fly even it can not determine the total weight of the passengers and their luggages before hand, why should the jet fuel be any different ? 1 Like |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by pcagbaji(m): 10:08am On Nov 16, 2018 |
Actually, there are three types of trails an aircraft can leave in the sky: 1. Condensation of water vapor in the exhaust gas and/or the wake This needs the very cold, very dry air at higher altitudes between 6000m and 12000m. Water vapor in the exhaust stream condenses and, pushing the local air above its saturation water content, forms a white, frozen mist. Also, particles from partially burnt fuel form condensation cores wich stabilise the contrail and let it grow over time from humidity already present in the air. Depending on the atmospheric humidity, these contrails disappear rather quickly by sublimation or can stay in place for hours and even grow into cirrus clouds. They are called condensation trails or short "contrails". [code][/code] While the added water vapor in the exhaust gas helps in contrail production, the condensation happening in the pressure field around an aircraft can already produce a contrail all by itself. If the relative humidity is close to saturation and the condensed droplets freeze quickly, the aerodynamic contrail will disappear rather slowly. The same condensation happens also at lower altitude but will not leave a contrail in temperatures above 0°C. Fog (liquid droplets) will vaporize quickly, but when frozen the condensation will last longer, until the water is re-absorbed by the air by sublimation, a much slower process than evaporation. 2. Smoke from unburnt or partially burnt fuel This was prevalent in early jets and allowed to spot them from a distance - just follow the black line, at its tip is an aircraft. Smokeless combustor cans which allow more fuel-air mixing put an end to this. 3. Oil mist or smoke flares The third source is shown in your picture: Oil is injected into the hot exhaust stream which forms a dense mist. This can be done with jets and piston engines, and gliders or parachutists use smoke flares. Once they are ignited (in most cases electrically) they burn down and cannot be switched off. Smoke flares on the wingtips and fuselage of a glider (picture source) There are many more things that can be sprayed from an aircraft (fuel, obviously, when it has to be dumped in an emergency, fertilizer or insecticides, silver iodide to seed clouds), but these are special cases. |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by Nicknamed123: 10:11am On Nov 16, 2018 |
dadalicious:until this article that was what you still taught |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by IbrahimDamola: 10:11am On Nov 16, 2018 |
Hotfreeze: The OP have given one reason why we see white clouds which is fuel dumping, you have given another reason. Contrails do not negate the fact that fuel dumping is done during emergency landing. So stop quarrelling with everything including your keypad. Fuel dumping is a fact and just one of causes of the 'white cloud'. Stop yelling and crying blue murder unneccesarily. See Wikipedia article of fuel-dumping below. Techcapon, nice read. 1 Share
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Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by Redhotchilli(m): 10:13am On Nov 16, 2018 |
This is mis-information. That isn't fuel dumping. Those are called CONTRAILS which is basically water vapour. Google is your friend. |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by Alphageometrix: 10:13am On Nov 16, 2018 |
Hotfreeze:You are absolutely correct. |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by TechCapon(m): 10:15am On Nov 16, 2018 |
IbrahimDamola:thanks 1 Like 1 Share |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by Nobody: 10:16am On Nov 16, 2018 |
somto10:never mind. A journey of a thousand miles starts with a step. I celebrated my 14 years flights across the globe, in September with a debut flight to the US on what people call a virgin passport. I was barely one year old on the first job I got immediately after i finished my youth service. I've dined with world leaders, including barak obama. All to the glory of God. Before you say I'm from a rich home....let me shock you...none of my relations had ever travelled to ordinary cotonou before and my parents are peasant farmers in ekiti. But we always enjoy sound education in my state. An ekiti woman could fetch firewood to train her children in the university, yes! They say my state has the highest number of professors in Nigeria and Africa...maybe they're right. God who showed me that kindness would also remember you. You'd fly someday and remember today for good. All the best!. 5 Likes 1 Share |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by cjscon(m): 10:23am On Nov 16, 2018 |
dadalicious:myself in my younger days we assume it was a falling rocket.. Lol |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by papaejima1: 10:24am On Nov 16, 2018 |
dadalicious:Bros, those white trails behind the aircraft is not fuel being dumped! OP has little knowledge of what he is saying. They are called Contrails. Google it up and get better informed Fuel is just an insignificant part of the whole contrail process |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by princetemitee(f): 10:26am On Nov 16, 2018 |
overdrive:afonja people don started again ooo |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by Newboss(m): 10:27am On Nov 16, 2018 |
The issue is that when a "know it" says that A is B, the "know it not" swallows it as fact OP, you never look those trails before to see that they remain visible and intact for some minutes? Very funny post |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by ImadeUReadThis: 10:30am On Nov 16, 2018 |
[s] TechCapon:[/s] This is probably the most bullsh!t nonsense I have read on NL. The picture is of condensation trails and not fuel dumping. |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by topsam1(m): 10:30am On Nov 16, 2018 |
educative |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by Yoighaman(m): 10:34am On Nov 16, 2018 |
@OP: Thanks for sharing. Very insightful. |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by dangoteinlaw: 10:35am On Nov 16, 2018 |
cyclops:more like NEPA and fulling stations |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by imma2(m): 10:42am On Nov 16, 2018 |
dadalicious:and who told you the op has enlightened you. The op has just succeeded in dropping wrong info here. |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by Youngstar76(m): 10:47am On Nov 16, 2018 |
... |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by Youngstar76(m): 10:49am On Nov 16, 2018 |
dadalicious: Not every trail with smoke-like appearance behind a plane is a plane dumping fuel. Fuel dumping rarely even occurs cos it ends up as a great loss to airline operators. It only happens during emergencies. Some are done even for entertainment displays. Contrails, or condensation trails, are "streaks of condensed water vapor created in the air by an airplane or rocket at high altitudes." Fossil fuel combustion (as in piston and jet engines) produces carbon dioxide and water vapor. At high altitudes the air is very cold. |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by Nobody: 10:52am On Nov 16, 2018 |
This is the dumbest post of the year, by someone who is blind but claims to see. What baffles me the most is his strong stance in ignorance. Believe me, such a person can never learn in life. The best thing to do op is to remain silent, not make your foolishness more evident. Thanks to the debunkers of this misleading post. |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by middlebelter(m): 10:54am On Nov 16, 2018 |
dadalicious: There are thousands of us with similar belief. Thanks Op for the lecture.Keep it up. |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by Beremx(f): 10:56am On Nov 16, 2018 |
I used to think it is rocket passing. I have learned something today |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by Godbuikem: 10:59am On Nov 16, 2018 |
checky619: The OP is not TOTALLY wrong. In as much as condensation trail (contrail) is the major explanation to this phenomenon, fuel dumping creates the same effect too. His explanation about fuel dumping is correct but fuel dumping is NOT the major reason for the formation of those white trails in planes, CONTRAIL is. 1 Like |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by Deepthoughts: 11:04am On Nov 16, 2018 |
TechCapon:But op,I once read somewhere that those white smoke like lines that trails aircraft are called CONTRAIL,I can't remember exactly how the phenomenon was explained but are you saying CONTRAIL is as a result of fuel dumping or they are different phenomenon with similar results?. |
Re: This Is The Major Reason Why Pilots Dump Fuel Before Landing. (PHOTOS) by babz11(m): 11:09am On Nov 16, 2018 |
dadalicious:You can be right in some way, because this only happen with big airplanes at high altitude, at high speed, what the hope wrote is wrong, The white line that we see from our houses, or in fact not just from houses, but the anywhere on the ground, are not from a rocket, but from a commercial jet aircraft. These may be: Contrails (Condensation Trails), and Wing tip vortices Read on to know the simple details of what they actually are. 1. Contrails: The aircraft that we see in the sky leaving that white line are in most cases, flying at an altitude of more than 25,000 feet. The atmospheric temperature drops as we go higher (The same reason that tall mountains are freezing). It is, on average, is -35 deg Celsius. Just imagine, what will happen if you put a glass of water in your refrigerator ehich has a temperature of -0.18 deg Celsius. The aircraft engines produce exhaust by burning hydrocarbon fuel (High grade kerosene) . All such fuels on burning, produce water vapours too. On getting exposed to such freezing temperatures, the hot vapours cool down and condense into water droplets or may be into ice crystals sometimes, creating thw white line 2. Wing Tip Vortices: These are more of a physics thing. The very reason that the aircraft flies is responsible for these tip vortices (Singular: Vortex). The reason is lift. The wings of aircraft are subject to lower pressure on the upper surface, and high pressure on the lower surface. This causes the air from the bottom surface to leak to upper part from the end part of the wing called the wing tip. This air lelakage creates a circular cyclone like structure called a vortex (The one you might have made in a bucket using your hand by moving the water in circular fashion). These also cause resistance to aircraft forward movement and is a cause of induced drag. The pressure due to the speed of the wind in this circular structure drops to a very low level, reducing the effective dew point of that region. This causes the air, which contains water vapours, to liquify or freeze, making them visible as white lines. They may not be visible everytime, but only in favourable conditions. However, they are always present. They can be reduced by using verticle smaller wings at the tip of the wing called winglets. I finished ground school even if I don't have my private pilot license (PPL)yet Op don't know where you get the wrong information |
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