Easier/cheaper to build. One axle, one set of blades and no gears. Less complexity.
Downside may be sausage strings when cutting the limbs from one side only and it will probably require more power to squize them towards a flat surface. Also, you will need twice the depth to the blades and a wider diameter of the cutter. If you want to keep the same chunk length you need to increase the number of blades, which in turn will require a machined axle.
A saying of ours goes something like: “No matter what direction you turn your arse is always behind you” 
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If you want a 'single blade" chunker, build one from a hay baler, or truck axle and run it at a much faster speed? I run mine at about 60 rpm so I can control the length of the chunks. If I cranked it up to 150 rpm and just shoved the wood to it I think I would get smaller chunks and chew the limb up faster. TomC
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I already did that, I am looking for something faster for smaller limbs.
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I agree Al those rebacks cut the entire branch not one chunk at a time , the chunkers we have are usefull for making select sizeing for bigger logs. The reback chopers pull the hole branch in and cut it up much easyer and faster. we just need the way too attemp the build. I want build one that chunks 4 too 5 " green soft wood at leaste. Plus they could be mass produced for sale.
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https://youtu.be/mc5-X7zJQN0 hi jo is this the angle on your blades , these look more like they would hold up too bigger log cuts. It seems too pull the branch through. this unit seems quit a bit two small for bigger logs though with 6 too 8 " shaft might work and some big drive gear reduction too lesson the Hp required ? the angle on the blade against another blade looks like might work better on bigger round cuts.
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Hi Al, with smaller limbs I just put 3 of them together and chunked them at the same time on my unit. Sometimes it is a little tricky with the crooked cherry wood limbs, but with poplar wood there is no problems.
Bob
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Kevin, that video shows a completly different beast. A high speed chipper, with the actual cutter as a flywheel.
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I thought it might have been though he called it a chunker and had a few big peices in his basket that he never showed much on the sizes. THANKS Jo it looks like must be a hard task too chunk bigger than 2" limbs with reback style chunkers. Looks like a remake design mods needed too have that type rotory feed system CHUNK 5" LIMBS AT 2" long rang. Mean time is your 2" chunker design here on dow or on youtube ? THANKS. I could save some time chunking limbs with your design. ?
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Thanks jo that thing makes a fast bucket of wood.
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I Don’t have a Rebak yet but am working on one. I believe that Daniel gave me enough wood with the truck to last till I get it done. It is mostly pine with other hardwoods mixed in. He had filled the covered trailer with chunks and we spent this evening bagging until we ran out of bags then we went and found every bin and trash can we could and filled them up as well. We estimated their is enough wood here for a few months for us.
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Hi jacub you have been gifted a nice size supply of motor fuel. At leaste the weather is better for working this time of the year. Good luck with you reback design.
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Hello all .
Just finished chunking a trailer load of wood ( first picture ) and second picture shows more wood in the shed drying .
A big white oak tree blew down within 50 yards of my chunker . I think I can get 10,00- 15,000 pounds of wood out of the tree 
Have wood will travel
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Hi wayne happy chunking, just wondering deep you load the trailer and how long too dry, and can you tell much difference when chunking hard wood green VS hard wood dry.Looks like fun chunking wood, from here anyway.
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Hello Kevin .
I spread the chunks on the trailer that is under the open shed about 6 inches deep and dry it to 20% or less .
It takes one or two weeks depending on the weather .
I don’t chunk dry wood . I have plenty of green or wet wood to pick from .
Congratulation on your chunker build 
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Mr Wayne, it looks a bit cooler compared to the 100F when Kristijan and were playing with that chunker of yours
I’ve had my final trailer of chunks sitting like that in the shed for a full month now. Apart from a few days of snow we’ve only had rain and a foggy mist cover us all that time. The chunks were green to start with but I bet they picked up even more moisture by now That particular batch will not be gasified until next summer.
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I have a hay wagon with the floor covered with wood chunks. I was pulling the wagon in and out of the barn to hope it would dry on the sunny but cool days. Now the weather is around freezing during the day and some days the sun is shining. Will the wood get drier on days like today. TomC
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Maybe a little, but not enough I’m afraid. You’ll have to ask permission to bring the chunks indoors for the final drying I keep 100-130 paper bags indoors at all times. That way I know every chunk I feed the truck has been warm and cosy for at least 3 months.
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Hi jo thanks for posting your wood drying habits. how warm are the bags inside in order too be good and dry may i ask for myself and Tom Collin. Here is a saw mill idea’ looks heavy duty.https://youtu.be/iolIAWOfgdY
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Anything above outside temp helps. Chunks spred out and a fan moving the air around would of course work even better.
I keep them bagged in the garage and temp around 50F only because that’s what’s convenient to me. Also I get to feed the boiler a little extra, which I don’t mind
That’s an awesome mill. I really like the mc idea.
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