Mittwoch, 17. Oktober 2018

First tests on my new drop test machine

The drop test machine is finished and I did the first drop tests.

And  more tests followed ...

And here are the numbers:


 The left 2 rows are the ropes Nr. 1 and 2 that held 5 drops, then comes rope Nr. 3 held two drops and broke at the 3rd drop. The ropes Nr. 4,5,6 held 1 drop and broke at the second.

The blue diamonds are the 60-cm drop test to measure the peak load. It shall not exceed 6 kN. They all would have passed that test.
The red squares are the first drtop: 2 meters, factor 1, attachment ate figure of 8 knots. The standard does not require measuring the peak load, but I did it. It is around 10 kN in the old ropes and 12 kN in the "new" (unused) rope.

Rope 1 amd 2 would have passed all tests.

But very important to know: Only the rope Nr. 1 is younger than the Eurostandard, the other ropes had been produced before.

And the standard is NOT matching the reality. The purpose of a standard is to make sure that ropes are fit for purpose.
And they are. Even if they hold only 1 drop, they for sure are fit for purpose. 

Good news for my theory:

Age is no discard criterion.

1 Kommentar:

  1. Hi Walter! Thanks for the great tests! If I understand, these are semi-static ropes? (I am used to 1,71 fall factors on dynamic ropes for UIAA tests...) Do you believe the same conclusion could be for dynamic climbing ropes?

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