Main Discussion Area > Horn Bows
Composite Longbow
sleek:
--- Quote from: mmattockx on December 11, 2020, 12:44:02 pm ---
--- Quote from: sleek on December 11, 2020, 11:31:40 am ---Whats the poison affect?
--- End quote ---
Poisson, named after French mathematician Simeon Poisson. It is the effect where a material changes dimension perpendicular to the direction it is loaded in. Think of pulling on a rubber band, as it stretches in length it gets narrower in width. Also, when you squash a rubber block it expands in width.
This affects bows with wide, flat limbs because the back is being stretched while the belly is being compressed. This means the back surface is trying to get narrower while the belly wants to get wider. The end result is the limb cups towards the back when bent. You can easily see the effect by drawing a bow with wide rectangular section limbs on the tillering tree and putting a straight edge across the back of the limb.
Mark
--- End quote ---
FASCINATING! Glad I asked, and thank you for answering!
Digital Caveman:
So, what kind of horn works, and which is best?
Pat B:
Gemsbok horn will work but water buff is what most Asiatic horn bows are made with. Goat will work well too I think.
Digital Caveman:
Thanks,
I found both at a pretty fair price. I think I'll go with gemsbok so I can avoid the uncurling etc.
WhistlingBadger:
--- Quote from: mmattockx on December 11, 2020, 12:44:02 pm ---
--- Quote from: sleek on December 11, 2020, 11:31:40 am ---Whats the poison affect?
--- End quote ---
Poisson, named after French mathematician Simeon Poisson. It is the effect where a material changes dimension perpendicular to the direction it is loaded in. Think of pulling on a rubber band, as it stretches in length it gets narrower in width. Also, when you squash a rubber block it expands in width.
This affects bows with wide, flat limbs because the back is being stretched while the belly is being compressed. This means the back surface is trying to get narrower while the belly wants to get wider. The end result is the limb cups towards the back when bent. You can easily see the effect by drawing a bow with wide rectangular section limbs on the tillering tree and putting a straight edge across the back of the limb.
Mark
--- End quote ---
Interesting! I never thought about that in relation to bows, but it makes sense. Thanks for explaining.
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