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The official website for AJ Hackett's Macau Tower bungee jump states in its conditions that:

Must weigh 40 kgs

This seems to be a really low limit, and I was wondering whether anyone has personally done the jump or knows someone who did, to confirm whether this is a rule they actually stick to strictly. Or am I misinterpreting the 'Must weigh 40 kgs' as maximum 40kg, as opposed to minimum 40kg?

(I did email them but they never replied.)

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This isn't a good question for the beta. It's not related to travel in a way that would attract expert travelers. (in this case it's way too specific to a particular destination) –  Michael Pryor Jun 24 '11 at 18:40
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@Michael I know this is specific, but I asked it because it is one-of-a-kind: Macau Tower bungee is the world's highest bungee jump, and 'adventure tourists' often go to Macau specifically for this. In any other situation, I would agree that the relevance of a such a question might not be very high. –  Ankur Banerjee Jun 24 '11 at 18:43
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This seems like a long-tail question and I thought that's what SE is for. –  hippietrail Jun 27 '11 at 22:49
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2 Answers 2

up vote 6 down vote accepted

The minimum weight for the jump is 40Kg.

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Wow, never found this question before on Travel.SE. I assure you it's a low limit, and I'll now explain the reasoning behind these limits.

The same limit applies to most bungy jump places - including where I did it, in Taupo, New Zealand. Bungy.co.nz shows some sample minimum weights that differ just in NZ - from 35kg to 45kg.

One thing to take into account is the elasticity of the rope. It can be hard or soft, but the more it stretches, the more it'll absorb your fall and you'll have less force applied to your body at the end of the line. This is why they use 'stretchy' ropes, rather than your garden-variety twine rope, for example. That would hurt like hell.

However, if your body isn't heavy enough to stretch the cord, it becomes somewhat like a garden rope, not absorbing some of the force and dampening your fall. The whiplash and jolt on your body would be severe. This is the reason for minimum weights.

What some companies have taken to doing is 'sandbagging', where they add extra weight to your drop, allowing you to meet the minimum weight. Most places also adjust the ropes depending on your weight anyway, to give you just the right amount of 'spring' and depending on whether you want to dunk into the water, for example.

If someone you know is below the weight restriction, and wants to jump, it may be worth phoning beforehand and asking whether sandbagging could be an option.

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I actually did do the jump, the AJ Hackett calculate the rope tension precisely to stop you around just 30m off the ground! –  Ankur Banerjee May 31 '12 at 8:52
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