I knew a fellow once that had a bench saw with about a two foot diameter blade powered by a lister diesel engine. It used to cut very well!! Even managed to saw his thumb and half his hand off...
Be a petrol chainsaw for me without any doubt whatsoever.
Used to work on a farm 40 years ago. They had a Stihl chainsaw with an 18" bar. Had to be a few years old then. It is still working well now, despite being in use all the time for the last nearly 40 years; So, a Stihl chainsaw it would be for me, without any doubt whatso ever..
I would think a bench saw would be dangerous as Tony and Prodave have pointed out. Be very very slow too...
As a matter of interest, here we have a video of chainsaw racing.. You would think these people would know a bit about chainsaws, but no, tango'd village idiots.. Why???? NEVER EVER cut things with the top of the bar. I have even seen forestry commission "experts" cutting with the top of the bar.
Well, experts my arse. What happens if you cut with the top of the bar?????????? ........................................... Answer, if the chain catches the saw is VERY liable to hurl itself towards you and upwards and cut your head in half. So, anyone that uses the top of the bar is a cretin.. end of.....
https://www.youtube.com/embed/RHT5EVCyXxA?feature=oembed
john..