I do understand swing arc. But if I'm standing and miss, all three lengths I'm discussing (15, 20, 25) will hit me--just in different spots.
No!
There is another way. (BTW, I am happy your are exploring these axe topics, Glenn! I sense a latent desire to maybe start using an axe.....maybe....?
)
Proper axe technique always has the axe NOT going into your body if the axe head keeps going. The shorter the handle, the more difficult this is to achieve. Its hard to describe in a text box, but the axe should always follow through into the ground, when standing. If doing something like de-limbing one handed, the swing is always away from you (think knife carving away from one's body - similar with one handed delimbing). When standing bend your knees to make a stance with an appropriate height, and configure the arc to go into the ground. You can practice this in slow motion when you are practicing. In fact that's how I teach axe skills, is using alot of very
slow motion exercises. Sort of looks like ti chi!
Heck it is axe ti chi!
The shape of the arc is all-important. You control that with both your stance, and how you bend your arms and also the wrists. The wrists have alot to do with the shape of the arc. There are other techniques such as using anvil logs for both end splitting and side splitting. I do not recomend one handed side cutting of poles like you see me do in some of my videos. It took me years of practice with one handed technqiue before I attempted that one handed cross cutting method, and I still am not competent with that technique which has serious consequences if you get it wrong, so I go very slowly and less powerful with that method. Stick with the basics for now is my rec'n.
For beginners, I would teach technique for ground cutting skills as the first priority, never upright delimbing which has more hard to control arcs. When practicing ground cutting technique, the arc of the swing can always be made to go into the ground (or anvil/safety log), well away from your feet. Axes also bounce out of the cut, and so part of what I teach in axe safety is hand control of the handle for the inevitable bounce, but that's another whole topic.
For kids and beginners the universal mantra I teach, and how I was taught, is to "use a longer handle", stay away from hatchets.
The 28 inch handle is the all-round best I find for starting folks with. I started using axes when I was 11 years old at canoe camp, and the instructors all made sure we used 28 inch handled, 2.5 pound axes, and kept us way, way far away from any hatchets. If you can find a reasonably light axe head of 2.5 lb's in a 28 inch handle, then you have a good reach to practice safe arcs that do not go into your body, and its light enough for one handed technique such as various splitting edge setting before you switch to 2-handed tap splitting. You may also want to carve with an axe (like maybe a paddle! ha ha
), and carving usually requires one-handed techque, so keeping the weight under 2.5 lbs for the axe head is what I recomend. This length of handle also gives you serious power for big splitting jobs like Memaquay mentions.
A few years ago I downsized to a 25 inch handle (GB Scandi Forest Axe), because I am getting older and wanted to cut weight on the axe head. I have over 40 years experience with bush axes, so I was ready!
It still provides enough power as I need for my cutting and splitting needs in the boreal forest, and I save about a half pound or so on weight. That little bit of weight reduction also significantly improves my one handed technique. One handed de-limbing (think about holding a "porcupine" pole up at one end, and with one hand cutting all the branches off with short snappy swings away from your body, under control). At home splitting bigger and harder wood for the woodstove, I am still using larger heavier axes. But for the bush, I love the 25 inch handle and lighter axe head. Its very safe for me too.
I am a small guy, only 5'4" and 150 lbs. Most guys are much bigger than me and if you are bigger than me, you should have no trouble with a 28 inch handle and 2.5 lb type axe head. The shortest I would ever recommend for canoeing is the 25" or 24" type axe at 2 to 2.25 lb head like I am using now on my trips. For backpacking where every gram counts, I do bring my 19 inch GB Small Forest axe, but I have the confidence and skills to use it, and significantly alter all my swings to new arcs. I would not start a beginner with a 19 inch axe.
That's my 2 cents Glenn.