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Japan,
Frankreich,
Russland,
die Ukraine.
korobokuru speaks maliciously about the standard length and thickness of rope in Japan. He doesn't believe, that the Japanese consider the standard a rope, which length is about 7 meters and a thickness is 6 mm.
korobokuru itself answers a question, why exactly 7 m. Really, Japanese consider standard a rope in 4 ken (the length of tatami). 1.81 * 4 = 7.24 (meters).The length is basically based on the convenience of the person, that ties. The length of the rope is not based on the person you ties. So, if you live in a country with very big people, that doesn't mean you need longer rope to accomodate this bigger bodies. You would still need rope, that accomodates your own body. Let's say, if you take the center of the rope and pulled a part ones, than you do it again, your end are shot little ends. So, you did three actions. Pull once, pull twice and than find the end of your rope. That is all you want to do. You don't want to pull ten times and then you find your ends and then you just again to find the center again and when tying you don't want to have 10 meters, 12 meters, 15 meters. You want to have reasonable length of rope. Not too short and not too long.
And just so happens, based on traditional measurments within the japanese system. You have tatami and you have all kinds of special units in Japan nowadays. So, based on this, plus based on the convenience, and based on body dimensions. Just so happens, that in the shibari system you work with rope, that is either 7 or 8 meters. And you always use the same length of rope, once you decided on one length, all your rope will be of the same length.
But this is not an exact science. Because the old measurements (units) cannot not EXACTLY be transfered into the metric system. From a practical standpoint, basically what you want is NOT having to pull rope more than twice the length of your arm(s). Otherwise you spend too much time with pulling rope = inefficiency.
What about rope length? Here in Japan, everyone seems to use ropes that are about seven meters long. But in the West, people are using all kinds of lengths. What do you think about that?
Again, there is a reason that we Japanese use seven-meter ropes. First of all, that length goes back to the traditional Japanese measurement system. Although we now use the Western metric system, most of the time Japanese rooms are still measured in terms of tatami mats, which is part of the old system. Two tatami mats together form a unit called a tsubo, and that’s the unit most people use when talking about real estate and land. Now, if you take a rope and run it around the circumference of a tsubo, those two tatami mats together, the length comes to roughly seven meters. So it’s a traditional length.
Now, the reason we use that length in shibari relates to the average arm span of an adult man, which is about 1.75 meters. Think of it this way: you take a seven-meter rope and fold it in half, giving you 3.5 meters. You pull it once using the full length of your arms, 1.75 meters, and you pull it again — another 1.75 meters, and then you’re done. It’s the most efficient length in terms of the average adult’s arm span. If the rope were longer, you would spend too much time pulling it.
Okay, but some people in the West do use longer ropes, say 10 meters, and they say they need the longer length because the people they are tying are physically larger than the typical Japanese woman.
I think it’s better to think in terms of what’s most efficient when you’re tying rather than the size of the model. You’re a Westerner, and quite a tall guy. Let’s stand up for a moment and compare our arm spans. See? Almost the same. So in terms of the pulling movements used in shibari, a seven-meter rope would be more efficient for you than a 10-meter rope.
Historical reason of 7m is not very sure, it is often said that to round "1 tsubo" is about 7m. "Tsubo" is old fashined unit to measure dimention in Japan. 1 tsubo equals to 2 tatamis. Standard tatami size is 90cm x 180cm, so 1 tsubo is a squiare of 180cm.
But nowadays you don't have to stick to the length of 7m. It depends on the size of your models.uses 6mm diameter of 7m and 5m because his models are normally Japanese women. 5m is for suspension rope.
Other mistresses who tie submissive men often use 8m or sometimes 10m, diameter of 8mm.
As European people are larger than Japanese, of course you can use 8m or 8.5m if you like. It helps you using less numbers of ropes. On the other, we must say shorter the easier to handle. Longer ropes are easier to be tangled up.
There are advantages and disadvantages.