Note, the below plans ARE NOT TO BE USED TO BUILD A TREBUCHET.  Anything involving large moving parts that 'launches' objects IS DANGEROUS.  It pains me to have to say this but, in the land of over protection of everyone, I need to protect myself by saying DON'T MAKE ONE, IF YOU DO, I CERTAINLY DIDN'T SUGGEST IT, UNLESS YOU ARE A PROFESSIONAL SIEGE ENGINEER, DO NOT TRY THIS AT HOME, DO NOT BUILD ONE AND THROW OBJECTS WILLY-NILLY AND LAUGH IN GLEE. A 10 foot beam with a sling and big heavy counterweight is a lot of kinetic energy. I provide these plans for EDUCATIONAL PURPOSES ONLY.

Ok, that said: these are the initial plans for the trebuchet.  Each square equals 1 inch (but, can be set to other scales).

Final metrics (using the Wintrebs schematic) are:

l1:20", l2:73", l3: 4-6', l4:23", l5:58", mb:15lb, m2: variable, ml: variable.

Specific numbers to try (changing ml:counter weight, m2: projectile, and l3: sling lenght

• l3    ml    m2    distance

• 5    100    1    230'

• 6    100    1    331'

• 6    100    5    52'

• 6    100    10    10'

• 4    100    10    8'

• 5    200    10    60'

• 6    200    10    61'

• 6    200    5    165'

• 6    200    2    422'

• 6    200    1    617'

• 4    200    10    50'