Aerodynamics

ranald · Captain Joined: Oct 12, 2004 Posts: 666

Hi 99jolleg
I think that is the fuel from the engines.I dont no the reason for it being there at higher altitude proboly becouse its coulder up there

Elkinallen · First Officer Joined: Sep 24, 2004 Posts: 446

In fact it is the same thing that causes the wingtip streamers, prop tip trails and all the other forms of condensation trails. Yeah, ok the hot exhaust that injects water into the freezing air does it too. But I am refering to pure pressure differential type.

I am interested in this kind of stuff. I like to share the info to all who is interisted. I will put the answer tomorrow.

Elkinallen · First Officer Joined: Sep 24, 2004 Posts: 446

The short version-
During takeoff and landing the angle of attack is at its highest. The air is WAYYyyyyy zooming over the top of the wing in a great arc from leading edge to the trailing edge. The air is traveling so fast in order to maintain the boundary layer that it enhances the by product of high velocity air. This is the lowering of its pressure. Now with the pressure lower, there is a by product of that too! It is a lowering of temperture. (Bernoulli's principle) The temp lowers enough for the damp air to come to its dew point. and whammo!! a cloud forms on the top of the wing.
The cloud disapears off the back of the wing because as it departs the trailing edge and meets up with the air from the bottom of the wing, its pressure rises again. (Because of the slowing down of the air.)

This same thing occurs in order for lenticular clouds to form over mountains as well as fog that forms with a light wind over a small part of land that is in the water. Like an island or penninsula.

99jolegg · Posted: Thu Dec 16, 2004 10:11 pm Post subject:

WOW

, you know your stuff Laughing

. Thanks that helps a lot, I've always wondered what it was. Thanks again Very Happy

Elkinallen · First Officer Joined: Sep 24, 2004 Posts: 446

Right on bud! Punk

Elkinallen · First Officer Joined: Sep 24, 2004 Posts: 446

Just another little snack.
My Father flew the heavies. He flew transport missions in the latter days of Vietnam. He was a ´Ricebird pilot´flying stuff in and out of Cambodia and such. Anyway, he said that his plane was hit by.50 gun rounds. He said that it is horsecrap that a bullit fired through the fuselage would cause structural failure. He said all they had to do was turn up the pressurization. BUT! Dont be sitting next to a window if a window is shot. It will most likely blow out and wether you are strapped in or not, you WILL be a skydiver!!!!!! Shocked

Elkinallen · First Officer Joined: Sep 24, 2004 Posts: 446

Ok! Who here knows the joke about Santa Clause going on a check ride!??!

I was watching an old aviation movie. It is called- The big lift. About the Berling airlift. This guy asks a pilot how he flys at night. How he sees where hes going. He replies- There is a light on each wing and one on the tail.

All I have to do is keep the plane between them.

HA! HA! H a! ha h h,,,

PH · First Officer Joined: Dec 10, 2004 Posts: 379

Yeah, always makes me laugh when in a movie someone fires one bullet through the hull and then bang rapid decom! It would be just like having the outflow valve open more than it should be. Pressurisation system working harder, bottom line less economy, but still flying! After a while with an increase in bullet holes there will come a time pressurisation can't cope...hope I never see this! Have had fun in the 757 sim training to react to decompression, rapid descent whooooo!

Elkinallen · First Officer Joined: Sep 24, 2004 Posts: 446

I know that rapid decom can be bad bad bad!!! Icing of the cabin and cockpit windows and every bit of dust in every corner being sucked out of their hiding places and swirled around.

Elkinallen · First Officer Joined: Sep 24, 2004 Posts: 446

I saw a C-180 skywagon ground loop at Cameron Park Airport in ,,near Placerville Ca.

What is a groundloop? Why do only tail draggers do it and tri cycle gear planes don't? Umm...

Elkinallen · First Officer Joined: Sep 24, 2004 Posts: 446

What is 'washout, angle of incidence and wing twist?

I will answer these in a few days.

Elkinallen · First Officer Joined: Sep 24, 2004 Posts: 446

Ground loop occurs because, in taildraggers, the center of gravity is behind the main landing gear. This causes the 'heavier' tail to 'pass up' the nose on landing when decelleration occurs. You gotta really be on the rudder when this happens,,, so it DOESN'T happen!!!

Angle of incidence is the longitudinal angle that the wing is attached to the fuselage. You can change the angle of attack as a pilot. But a mechanic has to change the angle of incidence!!!

Washout /wingtwist is,, well the wing is, has a twist to it!! It is designed this way. If you look from the wingtip towards the wing root, you can see this twist. It is twisted in a manner that has the wing root at a higher angle of attack than the wing tip. This is so that the wing root stalls or buffets before the wingtip does. VERY important!!! Shocked

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