Slide Show

[Annie]

http://thewebfairy.com/911/slideshow/noplane2/

When you start the slide show watch the edge of the smoke cloud. It
never
changes! It has the exact same silhouette in every frame!
Smoke does not sit still or rise in the same exact shape.

jimmy

[Andrew Johnson]

Hiya,

I had a look at the slideshow - if you reduce the slide show time to 0.25 (from the little menu selector drop down on the right hand side) seconds, I *think* you *can* see the smoke cloud changing shape.

The thought I would offer is that the plane is travelling at 400-500 mph on that sequence of frames and the smoke will be perhaps travelling at 5mph (approx 1% of the speed). As a rough guess, therefore, for a given change in the smoke cloud, you might expect to have to wait quite a few frames. That sequence is only 92 frames long - therefore either is 3.68 seconds in realtime (25 frames/sec - the usual for PAL=European TV standard) or perhaps 3.06 seconds in realtime (30 frames/sec - the usual for NTSC=American TV standard). However, because it has been video-captured onto a PC, the frame rate might be lower - perhaps 15 or even 12 frames/sec, so the above figures might need to be changed to reflect that.

So I think that is perhaps why the smoke cloud doesn't seem to change all that much.