Main Discussion Area > English Warbow
Help on warbow/longbow tiller - first post! / now with pics...
Del the cat:
--- Quote from: joachimM on November 24, 2017, 02:03:16 pm ---
--- Quote from: Badger on November 15, 2017, 09:39:45 am --- I have always felt the same way about the word elliptical being ambiguous. If I were to describe my preferred tiller I would say I like the middle 8 or 10" slightly stiffer and I like the last 10" of the limb barely flexing. I find if I get too circular the bows tend to feel more shocky.
--- End quote ---
Well, it's easy to define how elliptical the desired shape should be. Essentially, a circle is an ellipse with two identical (horizontal and vertical) radii. A flattened ellips has the horizontal radius longer than the vertical one.
Show us your ideal tiller profiles for ELBs, and we can easily deduce the proportions of the vertical and horizontal radius of the ellips. Say it is 1 to 1.2, we can henceforth define the ideal elliptical shape as 1/1.2, and we can also look at a tillering pic and see how much it deviates from circular, and how much from the ideal ELB (or whatever bow type that should have elliptical tiller, like holmegaards and mollegabets).
--- End quote ---
Yes it's easy to define an ellipse... BUT
That doesn't answer the question of how far round the ellipse the curve should go! >:(
You can take your ellipse and use a section from the centre which will look almost like an arc of a circle. Or if you take a full half of the ellipse it would be ridiculously whip tillered.
(refer to the pics in my earlier post).
Del
joachimM:
Granted Del.
You also need the angle of the arc each limb should cover at full draw, or the ratio of the arc covered by the bow to the circumference of the ellips.
willie:
--- Quote ---That doesn't answer the question of how far round the ellipse the curve should go
--- End quote ---
if your long axis is fixed at a given ratio to your bow length, the how far around question becomes irrelevant.
just adjust the minor axis to match the curve, no matter how far you have drawn the bow.
penderbender:
I do this a lot while checking tillering pics on my phone. I just use my coffee cup and tilt it til I see what I want. Cheers- Brendan
Del the cat:
--- Quote from: willie on November 25, 2017, 07:52:20 pm ---
--- Quote ---That doesn't answer the question of how far round the ellipse the curve should go
--- End quote ---
if your long axis is fixed at a given ratio to your bow length, the how far around question becomes irrelevant.
just adjust the minor axis to match the curve, no matter how far you have drawn the bow.
--- End quote ---
Yup, that would do it....
Just give us the numbers...
Del
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