So why not share talent and resources? For instance I still have many designs to yet build including my theoretical "supersonic capable" catapult or "bow".
My only tools are my brain, a hammer, hacksaw and vice. As we speak I have no money to speak of. But, I see where my experience in design could benefit many with their projects.
Many of you sound very educated (engineers). Some are skilled CAD program designers. Some talented and experienced pro builders with a full shop of needed machinery.
I have a few parts of this and that as I buy crossbows and covert them to torsion. Need limbs? Need a riser? Have an old bow yu would like converted?
You all seem to like Nick Watts 5000lbs ballista and its performance. There is no way I can be humble about this but feel a part of his machines current and future performance is partly based on my "manuballista" work.
As Nicks work is public once posted, I have no qualms about sharing his/my ballista secrets in attaining the high velocities that seem to elude most historical re-creations.
As an example, my current manuballista build is partially to attempt to persuade him to go shorter with the arms/levers. In doing so however, I am also hoping go shed light on some of the work of earlier "experts" like Marsden etc. and without apology even those of the original innovators like Philon, Vitruvius, Alexander etc.
My work and theories are highly contraversal (until proven), and I have no qualms about challenging the math as long as I have reproducable upon demand results - so be forewarned some of what I propose seems proposterous (like a supersonic catapult or crossbow LOL) or that acceleration can occur without an acting net force.
My request for barter exchange. I am wanting a wooden stock with roller nut and trigger (not tickler), with a 20" draw on which to put my manuballista bolt on "kit".
In exchange I will make this person one of my kits for his own use and study. It will be a non-compounding model Identical to Nicks Orsova build.
Fully optimized, it will deliver the same kind of performance as Nicks machine, except with a much higher effeciency. For example 5000lbs pull using a 7500 grain doing 395fps verified is only pulling 1.5 grams per lb of pull.
My last builds performance produced 200fps with 350 grain and 40-50lbs pull, or about six grains per llbs of pull. Derrick Middleton who tested it was impressed and said 300fps with 100lbs pull is reasonable to expect.
My calculations show that at 150-200lbs pull, the performance should be on a par with the worlds fastest production bow. not bad for 2000 year old technology.
I have every reason to believe I can design a rope bundle powered torsion inswinger manuballista under 350lbs pull to break 400fps. (the uppage inn power requirements is to deal with the friction loss inherent in all rope bundle power sources.
I have a never built before gravity powered torsion manuballista design for someone to build....
CAD or computer simulations and or services welcome, all offers considered.
If Nick ever gets off his ass again and completes the build, some really interesting things should surface in the understanding and interpretation of the original field frames and correct interpretation of the original design.
To suggest the Orsova ballista was an outswinger is simply ludicrous. Simply watch Gunny's mail call or Gunnies mail call on youtube, and then review the performance of Nicks machine.
All things being equal which would you rather have in a shoot-out?
BTW - my current build should hopefully be enough to convince Nick of the proper arm length ratio for the Orsova build. The Hatra design is diff.
Anyhow, the offer is open - barter only - no money exchange, postage responsibility of the sender....
Rather long winded as all my reply's (writer wannabe). Hope you all like the suggestion, and it may serve to hasten both builds and communal knowledge of making pointy things go real fast.
I envy you who have the added benefit of advancededucation.Without it I must be able to recognise known physics principles at work, be able to recognise, identify it. Without this knowledge I am no differnt that Newton or others that must figure these things out on their own. It is like re-inventing the laws of physics and all the various forms of acceleration and principals that effect it. Its already been done.