Wabanaki bows (Penobscot, Micmac, etc.)
Hi, I've been thinking for months about taking the time to write a tool for bow-FEM, and now here I find your project. Seems very interesting! :)
The cases I'm interested in are the variants of the Wabanaki bows (Penobscot, Micmac, etc.).
As I'm sure you know, but for issue's completeness sake, they have a main-bow / -limbs and a back-bow/daughter-bow/pony-bow / -limbs (dear child has many names).
What I'd like to do, in different levels of complexity is:
Basic level
- Define limb-properties for the additional backing bow individually (the pony-limb is usually shorter and more recurved, etc.)
- Define string-properties for the cable(s) connecting pony-limb to main-limb
- Must account for cable touching main-limb back (part of the benefits of the design: being able to control draw curve, by timing at which draw length the cable starts "backing" the main-limb)
More confability
- Define where the flexing part of the pony-limb begins in relation to main-limb ("mounted differently" on "riser")
- Define point from tip on main-limb for connecting cable (differ from main-string attachment)
- Etc
More complex: New physics introduced (?, friction/slide)
- On order to be able to simulate all the Wabanaki variations
- Basic style:
- one main-string, connecting main-limb top tip and bottom tip (common bow string)
- two cables - top & bottom pony-limb, connecting their tips to the main-limb tips (naturally, simulating top only is enough, like now)
- Variant one:
- one main-string, connecting main-limb top tip and bottom tip (common bow string)
- two cables - top & bottom pony-limb, Connected/touching as follows: tied main-top, slides over pony-top-tip, tied to point on "riser", same for bottom
- Variant two:
- one long string - Connected/touching as follows: tied pony-top, slides over main-top, slides over main-bottom, tied pony-bottom
- And it could be fun to test a variant where the string circles almost entirely (only being tied at "riser" top/bottom, sliding over all tips of all limbs.
- Basic style:
- Gives yet more ability to play with the draw force curve
How hard would it be to extend the simulation with this?
I'm quite apt at C++ but have no prior experience with FEM, nor a lot of physics.