4" capacity. I run everything thru 2" and smaller as the rest gets processed as firewood. Sometimes my wife wants pine wood chips for garden projects. In that case, I strip off the needle branches and run the wood thru up to the capacity of the chipper, that makes nice clean wood chips VERY fast.
If your plan is to just walk around and pick up little twigs, then yeah, probably not worth it. If you start chipping sizeable material then you're talking a whole different ball of wax.
You can find some decent chippers on the used market if you look around, or there is always the Chinese clones of the bx series chipper that are fairly cheap but work well.
if you really want to get fancy, get one with hyd in-feed, those are the best of the best.
Hmmm, that is interesting, seems the opposite of what everyone else was saying. How big of a log can your chipper take? And how big on average is what you are putting thru it to chip 10 yds in a weekend? I wonder if everyone else is running thru smaller limbs which take up a lot of room but don’t really have a lot of mass, so not a lot of chips?