This week a friend and I made a pair of bows on the basis of some mathematical modelling.
I modelled a pyramid bow using non-published, aggregated/averaged data from some white oak. I used a working strain that should theoretically have induced about an inch and a half of set. Between us I we made two - one 50 lb at 26 inches and the other 40 lb at 26 inches.
I haven't made exhaustive measurements, but the early indicators are that the final dimensions (thickness) are within 1 mm of the projected dimensions. You can see from the photos that we didn't get the finished bows to match the projections exactly, but they're pretty close. And the average set of two limbs is 40 mm - just slightly over 1.5 inches. As predicted.
Bows by the numbers - modelling a bow before cutting timber
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Bows by the numbers - modelling a bow before cutting timber
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Bow making courses, knife making courses, armour making courses and more:
http://www.tharwavalleyforge.com/
Articles to start making bows:
http://www.tharwavalleyforge.com/index. ... /tutorials
- Stickbow Hunter
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Re: Bows by the numbers - modelling a bow before cutting timber
Good work and very interesting. I know Dennis La Varenne was always interested in your mathematical modelling. I have the last bow he ever made, a beautiful Yew flat bow.
Jeff
Jeff
Re: Bows by the numbers - modelling a bow before cutting timber
That should be a national treasure.
https://www.instagram.com/armworks_australia/
Bow making courses, knife making courses, armour making courses and more:
http://www.tharwavalleyforge.com/
Articles to start making bows:
http://www.tharwavalleyforge.com/index. ... /tutorials
Bow making courses, knife making courses, armour making courses and more:
http://www.tharwavalleyforge.com/
Articles to start making bows:
http://www.tharwavalleyforge.com/index. ... /tutorials
- Stickbow Hunter
- Supporter
- Posts: 11644
- Joined: Sat Jul 26, 2003 8:33 pm
- Location: Maryborough Queensland