cool photos, not m/c related

[James Deuce]

Why wear a helmet
She has the wrong hair colouring (sorry girls)
At least she is giving it a go more than can be said for the majority of our population.

The Helmet's on upside down and round the wrong way!! lol.

[Holy Roller]

The Helmet's on upside down and round the wrong way!! lol.

Showed my kids the pix they did not see what was wrong

[James Deuce]

Showed my kids the pix they did not see what was wrong

My wife didn't either - yet another joke fell flat

[RiderInBlack]

Really ?? sheez I don't remember Flipper being that big

Tursiops can reach 4m in length (just another useless factiod ). Flipper was a short-asse.

[Zed]

This pic was emailed to me.. no disrespect to scooter riders or anything..

Lol, someone recently told me that they saw a young lady doing the same thing with her helmet...not really that funny!

[pete376403]

This one is pretty good; (first attempt at posting a file so if nothing turns up...)

[pete376403]

hey, it worked!

[riffer]

Jeez Pete, you sleep less than I do?

I guess that's the moment the plane passes the sound barrier, right?

I've heard they make some kind of steam cloud - what causes that?

[pete376403]

(according to the story that went with the pic) The shock wave passing across the craft is disturbed by projections and this causes water vapour to condense out of the air. You can see a lttle cloud above the canopy as well as the big one down the back. This was taken with a manual Nikon from the deck of an aircraft carrier. the pilot did a huge dive and levelled out near sea level. The photographer was pretty spot on with timing, etc.

I think this is the same phenomenon as you see at the wingtips of Boeings as they are coming in to land - the airspeed over the flaps must be supersonic, or close to it. Dunno - any aircraft experts here?

[jrandom]

The Helmet's on upside down and round the wrong way!! lol.

Sigh. I posted that picture here ages ago. Nobody ever remembers. Sniffle.

[El Dopa]

(according to the story that went with the pic) The shock wave passing across the craft is disturbed by projections and this causes water vapour to condense out of the air. You can see a lttle cloud above the canopy as well as the big one down the back. This was taken with a manual Nikon from the deck of an aircraft carrier. the pilot did a huge dive and levelled out near sea level. The photographer was pretty spot on with timing, etc.

I think this is the same phenomenon as you see at the wingtips of Boeings as they are coming in to land - the airspeed over the flaps must be supersonic, or close to it. Dunno - any aircraft experts here?

Used to work for an aerospace company, so here goes:

Planes stay in the air cos of the pressure difference caused by air flowing over the wing, low pressure above, higher pressure below 'sucks' the plane upwards (putting it very crudely.....).

All air contains moisture, but most of the time you can't see it. At certain points on the wing (e.g. wingtips) and under ideal air conditions, the areas of low pressure created by the wing moving through the air cause the moisture in the air to condense out and become visible as vapour.

If the pilot in the pic did a huge dive and levelled out quickly, there would be an enormous change in pressure at the back of the 'plane. End result = spectacular photo.

A plane doesn't have to be supersonic or even close to cause this effect.

[James Deuce]

Sigh. I posted that picture here ages ago. Nobody ever remembers. Sniffle.

Whiner

[Firefight]

(according to the story that went with the pic) The shock wave passing across the craft is disturbed by projections and this causes water vapour to condense out of the air. You can see a lttle cloud above the canopy as well as the big one down the back. This was taken with a manual Nikon from the deck of an aircraft carrier. the pilot did a huge dive and levelled out near sea level. The photographer was pretty spot on with timing, etc.

I think this is the same phenomenon as you see at the wingtips of Boeings as they are coming in to land - the airspeed over the flaps must be supersonic, or close to it. Dunno - any aircraft experts here?

Commercail Boeings are Subsonic, the vapour you see at wing tips, is caused by wing vortex, landing speed at finals of B747,varies around 200- 250 kph, deciding factors, head wind, landing weight, QNH, angle of approach, type of landing aid system in use, length of runway available etc etc.

Firefight.

[Firefight]

Used to work for an aerospace company, so here goes:

Planes stay in the air cos of the pressure difference caused by air flowing over the wing, low pressure above, higher pressure below 'sucks' the plane upwards (putting it very crudely.....).

All air contains moisture, but most of the time you can't see it. At certain points on the wing (e.g. wingtips) and under ideal air conditions, the areas of low pressure created by the wing moving through the air cause the moisture in the air to condense out and become visible as vapour.

If the pilot in the pic did a huge dive and levelled out quickly, there would be an enormous change in pressure at the back of the 'plane. End result = spectacular photo.

A plane doesn't have to be supersonic or even close to cause this effect.

El Dopa, nicely anwserd, the best defintion of principals of lift I have heard for a while.

Firefight,

[Coldkiwi]

now.. i saw that water photo a while ago and I thought the dorsal looked like a dolphin too. then my mate pointed out the vertical rear tail.... which is quite visible in the photo if you look.... so its gotta be a shark right?

...although, looking at it again... awwww I dunno!