------------------------------------------------------------------------------------------------------------------------------------------------Double knives were common in southern styles. Hung ga, CLF and wc have double knives. Usage and shape vary with families and styles.While Ip Man got his start with another teacher- good analysis will show that Ip Man's wing chun is different from that of his first teacher. Not likely that he made it up himself. He made the claim,credible to me,that Leung Bik-from Leung Jan's family taught him his advanced wing chun.
I think the most recent conclusion on Leung Jan is that he only had one son (Leung Chun, who died young) and that Leung Bik probably didn't exist. Who then was YMs later teacher? Did such a person exist at all? It is certain that YM only had 3 years with Chan Wah Shun from a very young age. His most important verified teacher then is Wu Chung Sok, an early student of CWS. Beyond this there is not much solid info. Did he learn more wing chun at a later date? I don't think that important
Ip Man named his knives- meaningfully- bot jam do. Bot is 8 in Cantonese. Common misinterpretation is that there are 8 jam motions.the bot is in the details of the motions.
IM was stingy in teaching the bjd-only about 4 of his students were taught the bjd by IM himself. Others learned from 2 of the four. Still others made up their own motions-IMO.
While there are many cutting and chopping motions- there are others including stabbing
As far as I understand it, YM did not know or did not properly explain why the 8. There is a lot of speculation but I have not heard a fully convincing answer. Lots of people cite the 8 character shape regarding knife orientation.
Knife derived from YM that I have seem is primarily a blade not point style. A few stabbing motions is all. Interesting given changes in how the knives were configured predominantly during the lifes of Leung Jan and Yip Man, respectively.
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