20" would be 10" once split. The open bottom box wedge gives the best fe To help you out, weve scoured the internet to see what other people have been trying and here is a roundup of the homemade log splitter plans we unearthed. can be easier than lifting them into place. However, if your log splitter plan has a short log length, then you won't be able to split longer logs in your splitter once built. Just my opinion - haven't used one. vertical wood splitter