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Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
A spark and "cloud" of charge jump from my VDG to my finger. I'm still not sure about the "cloud" but I think it may be charge in the air using the spark as a more conductive path to ground. Any one else with Van De Graaffs seen this? It's also interesting that there are/is streamers/charge coming from the flat surface of the sphere, I always thought that it took a sharp point to get that kind of behavior.
Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
Whoa! Turns out, the air in front of a super sonic ping pong ball (>600m/s) is compressed enough to heat the ball to the point of incandescence when it hits another object! The temperature outside has dropped below 0 recently and I can't get seem to get much more than mach 1 out of the cannon on cold days (I don't dare try heating the barrel and have it all go soft).
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