Why Battle Axes & Halberds have Curved or Straight Edges?

Why do some fighting axes have curved cutting edges, while others are straight? And why are some tilted, while others are parallel to the shaft? ▼3 extra EXCLUSIVE videos each month on PATREON, which make this channel possible:   / scholagladiatoria   ▼Facebook & Twitter updates, info, memes and fun:   / historicalfencing     / scholagladiato1   ▼Schola Gladiatoria HEMA - sword fighting classes in the UK: https://www.swordfightinglondon.com ▼Matt Easton's website & Pinterest: https://www.matt-easton.co.uk/ https://www.pinterest.co.uk/matt_east... ▼Easton Antique Arms - antique swords for sale: https://www.antique-swords.co.uk/ #medieval #axe #martialarts