Damn, that’s impressive! Very much so. Did he change the teeth? That’s the best I’ve ever seen. His wood cuts look great around 10 minutes in.
Now, I know I’m a long winded ‘talk too much’ kind of guy, it’s because I see the complexity of the thing and leaving out details seems like leaving out things that matter.
That guy’s chainsword is the best I’ve seen so far. One thing you’ll notice is he uses a bar to run the chain around. Modern chainsaws use a bar that is thinner in the chain so it can pass through the cutting medium. Our chain weapons use sideplates so you’d get stuck in the cutting medium, as you’ve noticed.
The other problem with a chainsaw is (being designed to cut wood) they cut slow, but slow cutting would get you killed in -most- fights. There might be exceptions with space marines being able to rely on their armor, but it wouldn’t be best practice.
The time increase would make a regular chainsaw a bad weapon overall.
You’d want your chainsword to cut and recover as fast as possible, ideally enough to face a regular weapon, which it certainly seems to do in the Eisenhorn books, (Eisenhorn usually carries a powersword, but has a fight with Arnault Tantalid a “Witch Hunter) of the Ecclesiarchy” while Eisenhorn is unarmed and Tantalid has a relic chainsword named Theophantus. Eisenhorn tries to fend him off with a number of objects including an iron bar that’s part of a floor candle holder, and Theophantus cuts them all in two VERY quickly, and he’d have killed Eisenhorn right there, but for Eisenhorn’s friends finally arriving and slipping him a force sword.
The force sword destroys Theophantus entirely.
Even so, we want more from a chainsword then a chainsaw rehilted. (though the one you showed above is the best I’ve ever seen.)
What it feels like to me, (and the observation that got me in trouble then) was a longsword to the English style’s preferences, which is a sword with room for both hands, but the blade being the same length as on a one handed sword, as George Silver wrote of in 1599… except with the blade being that of an Astartes chainsword, perhaps rehilted.