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Magnet catapult

Hobbyists can now re-enact battles of the ancient world!
Author: Rob Gallagher, United States
Online since: 07/04/2009, Number of visits: 342314
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Opposite poles attract each other, like poles repel - and it is this repulsion that can be harnessed, for example with this magnetic catapult.
After watching a period film about the siege of the Masada fortress by the Roman army, I too wanted to build a catapult.
For this purpose, I used the strong repulsion of two large disc magnets. 3 possibly options are linked below.

Damaged juggling balls
Damaged juggling balls
I built this shooting device from red oak. On the left, near the magnets, I placed brass fittings and on the right I put steel nuts and bolts near the joint.
For "ammunition" I used juggling balls.
The magnetic catapult shoots the juggling balls to a distance of about 3 metres! As you can see in the picture, the balls burst due to the strong impact.
I had a lot of fun with this little project.

Addition 2018

YouTube user RLScience also built a mighty magnetic catapult – even with two arms. For that, he used the repulsion of 3 Goliath magnets. In his video, he explains the assembly in detail (in German only).

Articles used

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S-30-10-N Disc magnet Ø 30 mm, height 10 mm, holds approx. 20 kg, neodymium, N45, nickel-plated
S-30-10-N
Disc magnet Ø 30 mm, height 10 mm, holds approx. 20 kg, neodymium, N45, nickel-plated
S-30-10-N Disc magnet Ø 30 mm, height 10 mm, holds approx. 20 kg, neodymium, N45, nickel-plated
1 pc. 8,57 EUR ea.*
from 3 pcs. 7,52 EUR ea.*
from 10 pcs. 6,57 EUR ea.*
from 20 pcs. 6,12 EUR ea.*
from 40 pcs. 5,72 EUR ea.*
Ask for a rebate from 120 pcs.
Available: 2 988 pcs.
S-30-15-N Disc magnet Ø 30 mm, height 15 mm, holds approx. 24 kg, neodymium, N42, nickel-plated
S-30-15-N
Disc magnet Ø 30 mm, height 15 mm, holds approx. 24 kg, neodymium, N42, nickel-plated
S-30-15-N Disc magnet Ø 30 mm, height 15 mm, holds approx. 24 kg, neodymium, N42, nickel-plated
1 pc. 12,79 EUR ea.*
from 3 pcs. 11,31 EUR ea.*
from 10 pcs. 9,99 EUR ea.*
from 20 pcs. 9,36 EUR ea.*
from 40 pcs. 8,78 EUR ea.*
Ask for a rebate from 120 pcs.
 
Receive e-mail when item available again
S-35-20-N Disc magnet Ø 35 mm, height 20 mm, holds approx. 38 kg, neodymium, N45, nickel-plated
S-35-20-N
Disc magnet Ø 35 mm, height 20 mm, holds approx. 38 kg, neodymium, N45, nickel-plated
S-35-20-N Disc magnet Ø 35 mm, height 20 mm, holds approx. 38 kg, neodymium, N45, nickel-plated
1 pc. 19,76 EUR ea.*
from 3 pcs. 17,49 EUR ea.*
from 10 pcs. 15,45 EUR ea.*
from 20 pcs. 14,46 EUR ea.*
from 40 pcs. 13,58 EUR ea.*
Ask for a rebate from 80 pcs.
 
Receive e-mail when item available again
Goliath Block magnet 70 x 70 x 30 mm, holds approx. 150 kg, neodymium, N40, nickel-plated
Goliath
Block magnet 70 x 70 x 30 mm, holds approx. 150 kg, neodymium, N40, nickel-plated
Goliath Block magnet 70 x 70 x 30 mm, holds approx. 150 kg, neodymium, N40, nickel-plated
1 pc. 148,54 EUR ea.*
from 3 pcs. 140,26 EUR ea.*
from 10 pcs. 132,86 EUR ea.*
from 20 pcs. 129,26 EUR ea.*
from 40 pcs. 126,07 EUR ea.*
Available: 46 pcs.
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