Many of them were, but flatbows have been found also. I could be wrong but I do not think that bows with a "D" cross section are harder to make than other bows, as a matter of fact D cross sections are and were pretty common. All that is meant by a "D cross section" is that the belly of the bow is round. I think (but I'm not sure) that the main factor determining how the bow is worked is the type of wood used, and if that's not true than I'm sure that wood type does play a large role in it. Yew bows are usually skinny and made with a D cross section; what allows them to be made that way is the high elasticity of the wood. White woods, which are not as elastic however, have to made wider and have flat cross sections. If a bow made out of a white wood such as hickory or ash were made the same way as a yew bow, it would be very prone to breakage and would not be able to achieve the same cast as the yew bow.
Also while I'm at it I would like to add a quote from The Traditional Bowyer's Bible Vol. II that I missed while skimming through it, I feel that if I would have quoted this before it would have helped my previous posts make more sense.
For those of you who don't know, string follow is when the limbs of the bow become permanently bent. All bows will develop some string follow after being shot several times, however the less string follow the better.It is also important to note that all evidence says that the oldest bow artifacts (and lots of others since then) were as tall as the men who shot them. This is an important element in keeping string follow to a minimum. Unbacked shorter bows will show more string follow, on average. As string follow increases, cast per pound drops.
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