From another thread, but I thought it would do everyone good to cover these points:
1 - Broadswords...
The term "broadsword is not medieval, it refers to basket hilted swords from about the end of the 17th century. Having handled several antique braodswords and katanas, I would say that the weight is more or less equal, with the broadsords tending to be up to 0.5lb heavier
2 - "I have seen western sword demos and ..."
western swordsmanship is almost never well represented, even by museum interpretation staff who are actors primarily and certainly not by re-enactors, who practice a safe form of entertainment combat. Displays form these groups tend to re-inforce myths of western swordsmanship, not dispel them. By all means look for the western martial arts youtube group for some decent reference.
3 - Medieval combat involved trying to smash thorugh plate armour". Armoured combat and unarmoured combat are almost comlpletely seperate arts as described by the extant combat treatises. Armoured combat (with the sword) focuses on leverage, use of weak and strong and attacking the un-armoured targets such as the armpit, groin, inside joints etc. It is simply not possible to "smash through" plate armour with a sword. Some weapons, such as the pollaxe were designed to smash/dent armour or to penetrate with a spike. These weapons are coverd by some treatises, where they are still used with a remarkable degree of finesse
4 -
Longswords are heavy. Nonsense. Utter, utter nonsense. The average weight of a medieval longsword would be between 1 - 2kg. There were larger heavier swords than that, but the 10kg swords you keep hearing about were very rare "bearing swords", intended to be carried before a noble or official in a ceremonial procession.
In order for a well made longsword to weigh 10kg, it would have to be about 9.5m long.
5 - Medieval martial arts favoured the strong over the weak. This is a fundamental missunderstanding of what the terms weak and strong mean. Better terms would be "hard" and "soft", which refer to actions from a bind, feeling the level of displacement and intention of the opponent and acting "Indes" (in the moment/instantaneously)
6 - Medieval weapons were clumsy and hard to weild.
Oh dear.
http://swordfightbradford.com/index_files/resources.htm
Have a look at the "What is the point of an Ubershinai" video. The salient points are about 2 mins in
7 - Modern martial artists who claim to do medieval/historical arts are making it up.
Please go to the webpage above and read one of the PDFs.