Kinda like this one. Bought it in new in '98. It's starting to show it's age but still works like the day it was delivered. 80hp Cummins diesel. It'll take a 12" log.
So, does green stringy wood bog it down? Just kidding. That thing is a beast. Nice tool to have in your arsenal.
Oh yeah! You can bog it down when you run big logs through it. Although there is a sensor on the alt. that shuts down the feed rollers when the engine RPM's drop to a certain point. I haven't done that since we started heating exclusively with wood but when it was new, I ran everything through it. It was easier to get rid of chips than wood.