I’ve worked up the plan to my satisfaction and it currently being proven by someone who I know will upgun it to the point of needing to be modified [sigh] sailors.
Anyway It takes under ten metres of 4X2 to build one along with screws, coach screws, a spring shackle, a few other bits and pieces and most expensively some nylon line. You can use cheap plastic rope but its just not very powerful. I’ll be using some retired absiel rope if i ever get a chance to build one myself.
Just a reminder this is not a huge stone throwing weapon of destruction. It is an educational project with the ability to throw a tennis ball in a statisically useful way. The plans include a couple of mathmatical activities to aid in making it interesting and useful. All this can be yours for the bargin basement price of $10. If you want to be notified when the plans are ready for distribution just let me know in the comments or email me.
I am just completing the plans for this:
An Onager made from 4X2 along with other materials. Its the same concept as the tennis ball ballista and requires moderate wood working skill as well as some power tools. It will be an excellent project for schools or youth goups with adult supervision and will be a commerical item at $10 for a PDF format plan and instructions.
I need one person to proove the plans. That means they get a draft set of plans and instrructions and use them to build the machine as designed within a short period of time. Not they get a set free plans that they share with all their friends and I never hear from them again. that would annoy me.
So if you are fairly handy with a drop saw and a dril let me know in the comments and we’ll see who is first.
Please note this machine is designed to be a moderate power and throw tennis balls as an educational device. You wouln’t be knocking down walls with it or throwing bowling balls. You will however be able to throw a tennis ball into the fairly small area with every throw.
In fact I was in the middle of an Introduction to the History of Modern Warfare exam when the urge of everything in my bowel to come out for visit won over the need to actually answer some questions.
This is also the reason that posting has been light and will be for a few more days. I only came in to drop off a form. Back to bed for me. Oh yes one of my legs has a graze and its blown up was well due to the infection. Sweet.
Goose feathers! My kingdom for some goose feathers people.(Its a really small kingdom and the maind hasn’t been in for a while) Inside NZ only, MAF wet themselves when anything biological tries to get throught he border.
I need them for flights for the riflepult ammo.
I also a handful of Roman triangular arrowheads that all weigh the same, buts thats a specialist mission.
In other news, if you happen to live in Palmerston North and have a workshop space I could borrow we should talk.
Its for a school project!