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2500 lbs is the rated swl.

Triple Whip Tackle. <iframe width="420" height="315" src="http://www.youtube.com/embed/43uW4jFN7SI" frameborder="0" allowfullscreen></iframe>

Holy moly, where's all the confusion coming from? I thought this was super simple stuff.

Haha a low stretch rope is amazing for lifting with the grcs. It's also hard to get the drum to grab 3/4" rope on heavy lifts. 9/16" is about the limit on the original capstan for heavy lifts without someone on the tail.

With regards to the grcs and lifting, high modulus ropes are where it's at. In that case 1/2" rope is plenty adequate. My biggest lifts with the grcs have been with 1/2" high mod ropes, such as Warp Speed or Validator.

I thought this thread was about a double whip tackle and variants? That picture would be a quad whip tackle.

How or why would you put multiple blocks on the same sling? A dwt with 1/2"rope and suitable blocks and sling is as strong as a 3/4" single line.

For hypothetical's sake, 23 parts of 1/2" line can hold 23x the weight of one 1/2"line. Using dwt+ lowers the load on the lines and depending, the rigging points.

Using a dwt or bigger means you can use smaller rigging, not bigger. I have a youtube video of us using the grcs and a twt to lift and lower 95' of broken pine in one piece. My youtube channel is "theRutherfordtree" if someone wants to embed the video. I'm pretty sure its title is "Cruise Pine."