Even before the Joint Stool book came out, and certainly since then, the number one question I get is where can I get a hatchet for joinery? What do I need, etc.
If you can stand some more about hewing hatchets, here goes. Last time I discussed a few ideas about how to use both single-bevel and double-bevel hatchets for joiner’s work. https://pfollansbee.wordpress.com/2012/12/04/new-to-me-hans-karlsson-hatchet/
While it’s true you can make either work, the single-bevel hatchet is ideally suited for hewing stock prior to planing it. Joseph Moxon’s Mechanick Exercises (1683) wrote:
“its use is to Hew the Irregularities off such pieces of Stuff which maybe sooner Hewn than Sawn. When the Edge is downwards, and the Handle towards you, the right side of its Edge must be Ground to a Bevil…”
Here’s my everyday hewing hatchet.

I was a bit vague last time about its configuration, and Robin Wood chimed in, helping to clarify some stuff. The back of the hatchet I often have called the “flat back” but it ain’t that at all. So I shot some views illustrating how it’s shaped. Think of it as a very large, very shallow, in-cannel gouge. Here is a straightedge held along cutting edge on the “back” i.e. the side w no bevel:

The benefit of this shape is readily apparent when you try to use one that is NOT shaped like this. Then the tool digs into the wood, and here it scoops the chips out. I next put the straightedge perpendicular to the cutting edge, to show relief in that direction as well. Some of this is the shape of the tool, some is exacerbated by honing:

I have another hatchet, same maker, JFR Fuchs, Cannstat, Germany, c. early 1930s. This one has a cranked eye, to keep your knuckles safe when hewing. This leans the handle away from the plane of action, without having to make a bent handle. I use this one particularly when hewing wide panels. Here the back of the hatchet is sitting flat on the board, and the handle is lifted off:

The shape of the back of the head is about the same as the previous.
BUT – you ain’t gonna find one of these hatchets in the wild. I doubt it anyway. Nobody gets rid of them. Mostly. When I recently discussed these tools with Drew Langsner, he said “probably the best hatchets ever made” or words to that effect. A strong & un-provable statement, but it gets the point across that these are mighty fine tools.
One type of hatchet you will find readily in the UK and US is the so-called Kent pattern hatchets. (A hairy-handed gent, who ran amok in Kent…) This one weighs about 3 1/2 lbs, about the same as the Fuchs…

Similar shape:

Nice thing about these hatchets – you can find them. They aren’t expensive. They can work. and they are reversible for lefties. Knock the handle out, and put one in from the other end. Often the cutting edge is straight. I prefer a curve to the cutting edge. So do others, I didn’t do the alteration on this one.
Here’s an earlier post about some of the same tools: