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Michael
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Tuesday, May 17, 2005

the joys of staying into the wee hours of the night in school:

Coop 4 students up in a classroom with aircon
Provide in large quantities chocolate
Give computer(s)
Force work with teacher and crazy deadline
Hear the gentle whirr of the keyboard, punctuated by occasional inane remarks from alankoh

Click send in gmail and watch the work go off into lalaland. The message punctuated by =)s every other word or so

Worry about dinner

crap i missed dramafeste auditions. damndamn

my chinese is like a pig's. damndamn

ggy wants to teach us murder:

"For high powered air cannon, a 2 metre barrel (minium) will be used with a huge air tank pumped to at least 100psi. This can be done using several good bicycle pumps because some good racing bikes require 120psi tire pressure. With longer barrels, larger air tanks and higher pressure, higher velocities can be achieved. I have personally achieved 110m/s with my air cannon at 80psi so I'm sure we can reach at least 150m/s with a much larger setup. This can be constructed either using pressure rated PVC (the walls are *thick*) or steel (heavy).
For explosive powered cannon, i can synthesize acetone peroxide with detonates at almost 6km/s IIRC. Of course the cannon will be loud and will be constructed using steel. There is danger not only for the operator but with the law as well due to legal issue. Muzzle velocities in excess of mach 2 is easily reachable. This requires an all steel construction.
The third would be the use of an electromagnetic linear accelerator. I've done extensive research and experimentation on such an accelerator (as well as having done a project for ISEF) and have successfully accelerated a 25g steel projectile to around 40m/s with 700J input with abour 2.85% efficiency. It is surely possible to acheive larger muzzle kinetic energies but this kind of set up will be expensive and run into hundreds of dollars. Hypervelocities acheivable. Pegasus railgun achieved accelerating a 1kg projectile to 3km/s. Sandia's acclerator accelerated a small projectile to 20km/s. Cost is huge."

20km/s. I think we can go to the moon on the cheap

"Of course we take safety seriously."

Somebody said that at 10:04 PM

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