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Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
I liked the winding wire, but; . a quick calculation gives about 0.125% efficiecy ? (4mm dia x 20mm steel = 2g @ 50 m/s vs 3mF @ 1200V) . it's nice when theory and practice coincide, but the design seems impractical therefore unrealistic. . the rate of change of inductance during acceleration is low so: . lots of energy will need to be recovered from the coil - the nett force acting on the projectile will be (relatively) low - giving low overall energy transfer based mainly on reading, with a tiny bit of experimenting.
Mounting the coil and projectile on an axial force transducer may be useful ? (must be immune to / shielded from the huge dB/dt etc.)
I don't know what kind of 'school' you mean, but to me, 'school' studends should not be encouraged to play with 3mF 1.2kV capacitor banks. much higher energy than a defibrilator !
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Another school coilgun poject
