Main Discussion Area > English Warbow
Another World Record!
adb:
--- Quote from: Badger on April 16, 2014, 07:59:22 pm --- Robby, actually he got somewhere around 55% of the energy into the arrow, which is still excellent for a 5.5 grains to the pound arrow.
--- End quote ---
How do you figure that? I'm not being facetious... I'm interested to know how you calculate the bow's (or any bow for that matter) efficiency.
adb:
--- Quote from: PatM on April 16, 2014, 07:45:52 pm ---I'd like to know the diameter of the string. Everyone knows that the surviving Mary Rose arrow nocks "prove" that warbows were only 80-100 pounds because it is impossible to build a natural material string that will hold up to any higher weight and still fit an 8mm nock.
::)
--- End quote ---
That old myth has long since been disproven.
gianluca100:
@ adb: could you tell more about that? I don't know the current viewpoint of the experts.
Thanks in advance,
gian-luca
WillS:
Well it's been disproved simply by this record. Joe is using natural fibre string with EWBS Livery arrows. Livery arrows have to be 3/8" at the nock end, and the nocks are usually cut with a standard tile saw or standard width bandsaw blade. They end up generally around 1/8" wide. Any wider and the strength of the nock is compromised.
Considering that Joe is using a 170# bow here it's fairly apparent that the string withstood the shot.
gianluca100:
@adb, thanks for your fast reply and the info. So it's not that somebody found out that the nocks did shrink during drying and/or conservation. They really were 3/8 inch wide. So for us metric this is a tiny bit more than 3mm.
I make my linen strings for my 50-55 pounder also that width, with a margin of safety of about 5 to 6 times the bow weight. If I would put that string on 170 pounder the margin of safety would drop to about two times the draw weight and that would be scary low for me :)
How much margin of safety do you think is safe for warbows of 120+ weight? Or how low do you dare to go?
On the vessels from the mary rose time they seemed to carry about 4 strings per bow, quite a good reserve. So perhaps they were awaiting some broken strings... or wanted to be on the safe side, being in war...
ciao,
gianni
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version