Blocks and slings

Kevin

Kevin

Location
Ontario, Canada
Anyone using a sling instead of a rope to attach the block to a spar for the purpose of dropping up to a couple of hundred pounds?
I am considering the use of a Tuflex sling for this purpose.
 
The thing to consider is the "throat" distance (the length from the block to the "choke" on the spar). The longer the throat, the higher the forces on the anchor, sling and lowering line. That's what is nice about spliced eye slings. One can minimize the throat distance by tying either a cow or timber hitch. Using a roundsling would be quicker, but the forces involved would be higher.
 
i think you can have SpanSet and Tuflex slings made custom sizes; and even use it as a block's tail; tie how you want. The advantage besides flexability of uses would be even wear; as the roundlsing would be in a different position each time.

Each has higher strengths avaialble too i think for matching to loading. The tough jackets, sealing out more contanimants than a line usually would i think from the load carrying core, that thereby is kept more supple. They shape to load or mount nicely, very low stretch polyester. Used them a lot working for someone else some time ago.
 
Four feet doesn't seem that big. That would be tight on a a 14" spar. I think that it makes more sense to have an adjustable sling for most purposes.

Why Tuflex? They are good quality slings, but I am wondering what makes you consider them for attaching a block. I have seen them used by people before, but I wonder what about them appeals to arborists.
 
Tod;
A 1/2" loopie will only adjust down to a minimum of 2ft. and has a WLL of 2000lbs.
A sling would choke the spar regardless of how small it is.
The loopie would have to be over a brach stub to keep it from sliding down the spar is what I'm thinking.
 
[ QUOTE ]
A 1/2" loopie will only adjust down to a minimum of 2ft

[/ QUOTE ]

Is that right? I have a small dia one that will pull into 6" or so. I know whoopies are less adjustable, but my loopie will fit a much smaller piece.

Tuflex is good stuff, but I don't think that you need all of that strength for 6" pieces. Maybe you could get a small loopie for the small stuff and use the Tuflex for the heavier stuff?
 
The circumference of 6" is 19".

The circumference of 24" is 75" .

That's a difference of 56" . /forum/images/graemlins/confused.gif /forum/images/graemlins/confused.gif /forum/images/graemlins/confused.gif
 
[ QUOTE ]
A 1/2" loopie will only adjust down to a minimum of 2ft. and has a WLL of 2000lbs.
A sling would choke the spar regardless of how small it is.
The loopie would have to be over a brach stub to keep it from sliding down the spar is what I'm thinking.

[/ QUOTE ]

I wish I had one here to check, but my take on the adjustment lengths stated in the catalog refer to the effective loop length when doubled, not the circumference of the loop as a circle (and especially not the diameter of such a circular loop).

If you used the device to choke a limb, the 24" setting would have a practical upper limit of just under 6" while the 48" setting would work up to maybe 13".

The loopie should choke the spar in exactly the same manner as a sling would, right? Or am I missing something here?

Glen
 
A loopie will adjust all the way down to the splice length (or the length that it has to be fed into itself). If a 1/2" line needs 24", than that's how tight it will go (just about). I thought that iot was more like 13" or so? I don't splice myself, but I remember that # from somewhere?
 
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