Hm The Traditional Bowyer's Bible says otherwise. Yew is one of the best bow woods to be sure, but you can make a good selfbow out of many different species of wood. AFAIK Yew bows can take a set as well, and in other wood species set can be mitigated with the right design and if the bow is well-made. Differences in wood performance aside, my original point still stands. Making a man-tall bow is not a novel concept, in fact it's pretty common.
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