10" is too small for a chip fuel, it can be done but not with out a lot of intervention. 10" is about the threshold for pellets vs chips. What I mean by the hearth diameter is the outermost diameter of what some call the burn chamber. On our machines the hopper outer diameter match this, if the " hearth is 10" I would call this a 10" gasifier.
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I run wood chips in our 6:"hearth with out problems… just sayin 
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How practical is it? 20 to 50 minute run time is not practical. If your going to run a small engine its just as easy if not easier to build it larger. You get better heat management, better fuel flow, longer run times and the machine is more tolerant. Im not saying it cant be done, I look at practical use of the machine. If we run perfect fuel that is dry we can do it too.
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Sorry, I meant 10" firetube gasifier 
No, our small system hold enough for about 2 hrs run time at 1.5 to 2 Kw
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This was our first harbor freight chipper. Right before the first oil change, it broke the engine crankshaft off. We are 3hrs into our second chipper… I recommend only buying the one year warranty, as it won’t last two years.
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The one I bought when I started this post still runs fine but I dont run it very much I doupt it even has a 100 hours on it.
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We take turns with ours. It goes four hours per tank of gas.
It takes a lot of brush to make enough chips to mulch the garden. The chipper is working good though, and I think we can get the garden mulched before the weeds take over. Still not enough grass to cut yet for clippings.
Matt, do you use a trommel like Greg Manning, to screen the chip size for your producer?
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I mostly bought commercial chips when I was doing wood fuel. I made a rotary drum screen with 1inch x 1/2 inch screen. Yeah lots of work and a lot of unusable chips with the smaller chipper. That new drum chipper does a better job though.
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