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General Tabletop Discussion
D&D Older Editions
A ropey issue
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<blockquote data-quote="Cleon" data-source="post: 8143970" data-attributes="member: 57383"><p><span style="font-size: 22px"><strong>Addendum</strong></span></p><p>I forgot to mention that the listed diameters of ropes are for ropes <em>under tension</em>, since they are measured when the rope is being stretched during its manufacture (likely after it's spun together on a ropewalk in the case of D&D level technology).</p><p></p><p>If a silk or hempen rope were stretched to near its breaking point of 120-125% its normal length then, assuming its volume were the same, it would be roughly 110% that thickness when unstretched.</p><p></p><p>So so the "resting diameter" of a silk or hempen rope ought to be somewhere between 1% and 10% higher than its listed "under tension" diameter. Now I don't know how much professional D&D ropemakers test their products, but if they normally test a brand new rope to near its breaking load to ensure it doesn't have any flaws that would cause outraged adventurers to murderhobo them it could be that the actual thicknesses of the ropes listed above are 10% higher than the quoted diameters. However, they could just as easily only stretch the rope to, say, its maximum working load of 1/2 its breaking load, which'd make the resting diameter 5% or so higher.</p><p></p><p>A percent or ten doesn't see to be enough to make a big song-and-dance about.</p><p></p><p>The <strong>spider's elastic rope</strong> homebrew is really stretchy though, stretching up to 400% its normal length means its resting diameter should be 200% its fully stretched diameter. That might suggest I need to amend the "about 1/2 inch thick" to "about 1 inch thick?" but, upon reflection, I think the rope would be made under roughly the same stresses (up to 125%?) as a normal silk rope or spider's silk rope - a spider's capture web isn't under extreme tension after all, since the arachnid spins it to have a lot of "give" to absorb the impact of prey blundering into it.</p><p></p><p>Oh, and for the sake of completion the <strong>spider's climbing rope</strong> homebrew has a breaking stress of 150% (so a 50 ft. length may stretch to 75 ft. before snapping). That indicates it absorbs 1 point of falling damage per 5 foot of stretch, which is comparable to the spider's elastic rope's 1d6 per 30 foot (ten yards divided by max roll of one six-sided dice = 30/6 = 5 ft.).</p><p></p><p>Actually, I think I'll incorporate the stretch length in the writeup above.</p></blockquote><p></p>
[QUOTE="Cleon, post: 8143970, member: 57383"] [SIZE=6][B]Addendum[/B][/SIZE] I forgot to mention that the listed diameters of ropes are for ropes [I]under tension[/I], since they are measured when the rope is being stretched during its manufacture (likely after it's spun together on a ropewalk in the case of D&D level technology). If a silk or hempen rope were stretched to near its breaking point of 120-125% its normal length then, assuming its volume were the same, it would be roughly 110% that thickness when unstretched. So so the "resting diameter" of a silk or hempen rope ought to be somewhere between 1% and 10% higher than its listed "under tension" diameter. Now I don't know how much professional D&D ropemakers test their products, but if they normally test a brand new rope to near its breaking load to ensure it doesn't have any flaws that would cause outraged adventurers to murderhobo them it could be that the actual thicknesses of the ropes listed above are 10% higher than the quoted diameters. However, they could just as easily only stretch the rope to, say, its maximum working load of 1/2 its breaking load, which'd make the resting diameter 5% or so higher. A percent or ten doesn't see to be enough to make a big song-and-dance about. The [B]spider's elastic rope[/B] homebrew is really stretchy though, stretching up to 400% its normal length means its resting diameter should be 200% its fully stretched diameter. That might suggest I need to amend the "about 1/2 inch thick" to "about 1 inch thick?" but, upon reflection, I think the rope would be made under roughly the same stresses (up to 125%?) as a normal silk rope or spider's silk rope - a spider's capture web isn't under extreme tension after all, since the arachnid spins it to have a lot of "give" to absorb the impact of prey blundering into it. Oh, and for the sake of completion the [B]spider's climbing rope[/B] homebrew has a breaking stress of 150% (so a 50 ft. length may stretch to 75 ft. before snapping). That indicates it absorbs 1 point of falling damage per 5 foot of stretch, which is comparable to the spider's elastic rope's 1d6 per 30 foot (ten yards divided by max roll of one six-sided dice = 30/6 = 5 ft.). Actually, I think I'll incorporate the stretch length in the writeup above. [/QUOTE]
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