Recent content by MartinDWhite

The style with one rope completely inside the other rope. I have not tested the split rope design. Knots are the failure point in just about any rope setup unless there is undo rope wear. That or the rope over an edge. Are you testing some soft shackles that are not failing at the knot?

To continue with the math (and arguing uselessly on the internet with a total stranger) it takes over 9,000 joules of heat to raise the temp of the 600 gram aluminum block from 90*F to 150*F ( Q = m x c x ΔT ). That means the 6650 J of loss in the system, if completely converted to heat, is not...

I will stick by my statement that heat from a winch using a soft shackle and synthetic line over an aluminum pulley block can't hurt either line. There is just not enough energy from the winch to heat the block with friction to a temperature that can damage the line. There is not enough distance...

The knot is the weak point and will break in all 1/2" soft shackles at less than 40,000 lbs. specifically the rope on entry to the knot will break if the knot does not slip undone. I know this because it is the failure mode for every block I have tested. Again....there is no where near enough...

Look back in this thread and there are some hard numbers about heat and melting sync line. It just CAN'T happen with this type of soft shackle and aluminum block. To damage synthetic line it needs to be too hot to touch.

I make and sell solid recovery ring in the USA. PM me, or see the ebay link in my signature. The heat issue was discussed earlier in this thread and it is just not possible to get it hot enough to do damage. The knot is the weak spot in all soft shackles and is the point of failure in all the...

There are definitively discounts available for purchasing multiple. Anyone interested should PM me. I ship world wide.

There are definitely opinions both ways on these, but I love them so much I started making them. I worked with a small machine shop here in South Carolina, USA, and made another run of recovery rings. This time in orange. If anyone wants one, message me or check them out on ebay..... Yes I ship...

I worked with a local machine shop to make a small run of these for me and some friends, the extras are up on ebay. These have worked great for us. Check them out on ebay if you want one. http://ebay.us/LXTvGw?cmpnId=5338273189

The hi-lift is super dangerous because the force can be sent back to the handle and it can bounce up and down beating you in the head repeatedly. The hi-lift will rust up and require maintenance to keep working. The hi-lift jack weights 30 lbs. vs the 13 for the Radflo. The Radflo only has...

Probably going engrave (or stamp) my name on the side and leave it raw aluminum finish.

I have a lathe and big chunk of aluminum...so guess what I am making for myself.

OMG, I didn't know the difference between a pulley and a sheave, in fact had never heard of a sheave. Thanks to google I do now. Soooo......as soon as I get some 7P style sheaves I will stop carrying the steel pulley blocks, and when needed on the trail I will build a pulley system from the...

The only remaining time that I use a metal shackle is when I need to use a pulley block to change the direction of pull (because my pulley block has thin edges), or hook to someone else's attachment points that still have sharp edges. The pulley block situation will be resolved soon with the 7P...

Climbing rope has about 17kn to 22kn break strength. 17kn is about 3800 lbs. Old rope loses up to 50% of its strength. a knot reduces about 50% more. Using old climbing rope to make a soft shackle could leave you with something in the 800 lb to 1600 lb range. Be very careful using old climbing...