The science of trebuchets...
Discussion
Anyone know any thing about trebuchets?
I built one with my son over half term and it releases too late so the projectile smacks into the ground about 6m away. The arm is about 1.5m long and the weight is a bit of a mix (bit of an old boat engine, an axe head and a lump hammer...) that weighs about 2.5kg. I didn't use plans, which might have been an error.
I built one with my son over half term and it releases too late so the projectile smacks into the ground about 6m away. The arm is about 1.5m long and the weight is a bit of a mix (bit of an old boat engine, an axe head and a lump hammer...) that weighs about 2.5kg. I didn't use plans, which might have been an error.
Edited by Bill on Sunday 18th February 17:16
Lynchie999 said:
https://youtu.be/Dp7XoUrqMQA
Don't know, but filmed this at Corfe Castle this week in 2x slow mo... 14lbs of football was the projectile, landed at the top of the "green" grass bank!
That's what inspired it, we live just down the road.Don't know, but filmed this at Corfe Castle this week in 2x slow mo... 14lbs of football was the projectile, landed at the top of the "green" grass bank!
JonChalk said:
It sounds like it's slowly down too late in the swing. Or maybe the rope is too long.
In other words, it's still trying to accelerate the missile right through it's arc, until it's too late a release.
We've made a better sling since that picture which is shorter. If it's much longer than the pivot point it doesn't accelerate the projectile along the base and just lifts it.In other words, it's still trying to accelerate the missile right through it's arc, until it's too late a release.
I'm wondering if the uprights need to be taller.
227bhp said:
That's cheating! But more effective than my search, thanks. It looks like it's the pin angle. Shame it's dark now. 
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