Rookie DdRT Error. How not to tie yourself to the top of a tree.

I got stuck up a tree on Sunday. Kinda. I was with somebody who descended and resolved it, but it was a learning-point - particularly when I usually climb alone...

I had ascended with a doubled rope, and then hauled up the tail and dropped it elsewhere to get it out of the way of my climbing partner. The way I did that was to pull up the tail incrementally and allow the taken-up bight to descend down where I wanted it to go. What happens if you do that is you end up holding the free end with the weight of all the slack rope pulling it down. The natural inclination then is to drop it. On this occasion the weight of the rope pulled the end with enough force to cause it to wrap completely around a limb much lower down, leaving it as in the image.

All seemed well until I tried to descend DdRT, when the standing end of the rope would not come up, thus preventing me from descending at all - and preventing me, therefore, from untangling the tail. To compound the problem, the single wrap meant that gravity would pull any slack out of the standing end, essentially acting as a progress-capture device, allowing me only to ascend.

Lessons learned:

  • This is why you should climb with a partner. Thanks Jos for descending and unwrapping my rope.

  • Don't drop the bight. You are probably ok to allow it to descend until you have the tail-end (though take care! The alternative is to bag the rope as you pull it up...) but then feed the tail down where you want it until all the slack follows it down and is deployed. This takes the energy out of the system, reducing the possibility of wrapping.

  • If you do get in this situation, anchor the working end to a limb near you and climb down SRT to unwrap the rope. If you have a throwline with you you can tie a retrievable anchor and not have to climb back up, but if not the extra climb serves you right!

  • Climb with a backup system. I always have a hand-jammer and foot-ascender, but I've added a gri-gri to my always-on harness-kit. With the progress-capture effect of this wrap it would have been tricky to tie a munter or super-munter for descending, and that wouldn't have been great for stopping at the wrap anyway.

Stay in school kids!

At Sprydon Beacon with Jos

Showed Jos the enormous pines up Sprydon Beacon today. An arduous climb with views and tranquility that more than make up for the sweat.

This is Nigeria

Oh wow... 

Lyrics, Vocals & Recording: Folarinde 'Falz' Falana | Video Director: Iyobosa 'Geezy' Rohoboth | Video Producer: Wande Thomas | Internet: David Evans-Uhegbu | Executive: Sidney Sule, Femisoro Ajayi & Folarinde Falana | Transmitted by Bahdguys Records through Jungle Entertainment Ventures | Originally by Childish Gambino | Falz in 'This is Nigeria!'

RTCUK Sleepover 2018

The Recreational Tree Climbing UK annual Sleepover is always good and, as usual, failed miserably to disappoint.

By no means everybody. Lots of shirts were in evidence. Kerry, Lawrence, and I had nice high hammocks...

This is the canopy above my bed...

The dawn chorus was amazing, but that early in the morning I was all zipped up and snuggled down. Later on (7:30 - very respectable) I recorded this:

This is how to get out of bed in the morning. It does rather mean the route to bed the night before is a right pain in the arse.

Wakazono

Can it ever make sense to talk about 'art' or 'craftsmanship' in the context of a computer-machined hunk of aluminium?

Yes!

Designed by Nendo:

Firstly, grooves of 5mm deep, 1.8mm width were carved in constant intervals on the vase’s exterior, resulting in two different levels on the surface. The first pattern was then carved 2mm deep from the external surface, while the second pattern was carved 6mm deep from the deeper immersed surface.

This calculated process results in the creation of a four-layer surface with different depths, allowing the patterns to appear visually according to the angle in which the vase is viewed. The dimensions and proportions of this process were carefully examined and tested due to the effects of deviations; if the initial grooves are too deep, the dark casted shadows will visually block the pattern, conversely if it is too shallow, the two patterns will blend together without a distinct separation.

By using multi axis machinery, some grooves were carved to 1.8mm in width, and only 1mm thickness at the edge. These narrow dimensions cause complications, as the grooves can easily break due to clogging of scraping material. Furthermore, if the cutting speed is too high, the temperature of the cutter rises, and can cause metal distortions. Accordingly, the production’s duration and dimensions were carefully adjusted, and milling was done gradually in 0.5 mm deep layers.

This delicate process originated from a 100kg block of aluminum, that after 7 months, resulted in a 15kg vase.

Up a tree in the sun

Another brilliant climb in the wonderful weather. A huge (and very familiar) London Plane in King George V Playing Fields in Exeter. Just great!

Brilliant Steganography

FontCode is an ingenious system of tiny font adaptations to hide messages in printed (or screen-text) documents. It would be perfect for watermarking, for example, while the video demonstration uses it as an elegant (though undetectable?!) alternative to QR codes.

from Wired.