Many of the bows from the Mary Rose are round or ovoid and not a perfect D.
The D became a standard of the British Long Bow Society but medieval bows as evidenced by artifacts did not conform to the standards of the BLBS.
--- In SCA-Archery@yahoogroups.com, Dan Stratton <agincort@...> wrote:
> If I recall Otzi's bow description - it was heartwood yew, round - not D shaped,
> no riser, no nocks. Definitely not what became the longbow in the Middle Ages,
> but a yew bow never the less.
> .............. Ian Gourdon of Glen Awe
> Midrealm Forester - OP
> "- bows of carved wood strong for use, with well-seasoned strings of hemp, and
> arrows sharp-pointed whizzing in flight."