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Hey smart mathy types... 
12th-Oct-2008 09:57 pm
Lets say a person is swinging an axe to bust up some roots. the axe head is 12 lbs, the handle is 3 feet long, the person is 5'10'' and lets say average strength. the roots are, obviously, in the ground.

Can we come up with a broad ballpark figure at how hard the ground is getting hit, somehow, with your mathemagic?
13th-Oct-2008 02:47 am (UTC)
how hard is the person swinging?

12 lbs would be a ridiculous weight for an axe.. even the BIG rock breaking sledges are only 8-10 lbs.

But, ballpark.. MUCKING HARD. :)
13th-Oct-2008 02:48 am (UTC) - uh
Dat vas me. :)
13th-Oct-2008 02:58 am (UTC) - Re: uh
silly boy.

based on my experience using axes, the axe head would travel in an approximately 90 degree arc from 9 feet up in approximately 1 second.
13th-Oct-2008 03:09 am (UTC) - Re: uh
I was guessing 12 lbs., based on how it felt in my hand. You might well be closer, though, with 8-10.

As far as how hard I was swinging, once I got my rhythm going, each swing felt like a line drive; probably 120° in 0.5 to 0.75 seconds. Oh, and let's not forget the sharp exhale on each swing.

It was almost like playing baseball, just turned sideways.

13th-Oct-2008 03:00 am (UTC)
Yah, I saw a show recently pointing out that a fully-armoured 8-foot poleaxe weighed only 11 pounds. My old firewood-splitting axe was 3.5lb., and it was a killer for the job.

Off-hand, I'd guess the axe-head would be moving about 80km/h when splitting in that situation. To reach that speed in the second or so it takes to swing it would give acceleration of about 25-30 m/s2. Force is mass times acceleration, so mass (about 1.5 kg) times acceleration is a force of 35-45 kg*m/s2.

That help? :)
13th-Oct-2008 03:04 am (UTC)
I have a reproduction 8 foot glaive, steel head, etc, and the head weighs about 2 lbs, the whole shebang (counting haft) probably weighs.. 8 maybe?

They tend to WILDLY overstate the weight of medieval weapons in a lot of cases.. swords were 2 to 3 lbs, greatswords 8 or so. (And I mean the William Wallace psycho-swords).

(The problem being, they make the "modern" versions too damned thick, compared to period swords, so they end up being overweighted)
13th-Oct-2008 03:14 am (UTC)
wow, thanks. that is mucho helpful.
13th-Oct-2008 03:14 am (UTC)
Looks like I'm overestimating, then. The axe as a whole, though, weighs more than Miranda (kitty), who was just weighed at six pounds.

It simply amazed me, though, when I was told that my blows were felt through the floor of the third floor apartment. The building was twenty feet behind me.
13th-Oct-2008 03:15 am (UTC)
this whole mess you see before you is a very complicated way for me to say "I'm not surprised, really."
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