【一日一结】绳梯（Rope Ladder）

我们一起传递正能量～

▍来源：instructables(rinkishimo)、互联网

在攀登过程中，绳结打法的对错和速度有时关乎性命，因此熟悉各种绳结的打法与其功能是极其重要的。绳结技术的掌握来自不断的练习，体会。初时可按图依样，然后离开书练习，甚至单手打出。每一个步骤都要非常正确，毫不含糊。要做到在黑暗中或其他各种条件下能自如打结，同时也应知道如何解开结，因为在许多危险时刻，不会解开结比不会打结更糟糕。所有的绳结在完成后都需收紧才能使用，同时绳端至少预留5厘米，以免意外松脱。

绳梯（Rope Ladder）

Step 1: Ideas and Expectations

Picture of Ideas and Expectations

This ladder should have:

- eye at the top for hanging

- two tails at the bottom for tactical usage

- width for one foot

- height as long as possible :) lets say 7 meters 

- reasonable weight

- eye is crucial and needs protection (rope thimble)

- rungs are made from rope

- knots are under rungs only

Step 2: Material and Tools

Material:

- main rope - static rope 7 mm in diameter (15 kN, blue color)

- rope for rungs - reep 6 mm in diameter (10.5 kN, golden color)

- insulating tape

- rope thimble

Tools:

- tape measure

- scissors

- round nose pliers

- lighter and bowl of water

- pen and notepad

- tying tool (just a piece of wood and two long nails, 16 cm between them)

Step 3: Math

Don't be afraid, it's nothing complicated. Just a few calculations of rope lengths. Let's see:

Golden rope (the one for rungs, 6 mm in diameter)

You need 1.8 meter for every rung and 3 rungs for every 1 meter of ladder, plus 1 bottom rung. So:

7 meter ladder = 7 x 3 rungs + 1 rung = 22 rungs = 22 x 1.8 meters of rope = 39.6 meters of rope

Allow yourself some reserve for tying knots and burning ends. 41 meters should be enough.

Blue rope (the one for main strings, 7 mm in diameter)

You need two times height of ladder plus knots plus top eye plus bottom tails:

7 meter ladder = (2 x 7) + (22 x 2 x 0.1) + (1.5) + (2 x 1) meters of rope = 21.9 meters of rope

Again, having some reserve is recommended, 24 meters is fine.

Step 4: Rungs

Step 5: Right Side

Step 6: Eye

Step 7: Left Side

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