retracting reels

Ha, fantastic! Have been following this thread and was thinking "hmm, pretty sure I have a tape measure that the hook on the end broke, maybe that could be modified...". (How did I break the end off? Tape measures are also good for fishing wires through wall / ceiling cavities...) Already comes in a sturdy, meant to be tossed around case, with a belt clip! Nice job @danimal3 !
 
I ordered a retractable reel from Amazon (gear keeper, 58oz retract force) and recycled a couple of old CT foot ascender and straps to make this.

I'm gonna swap any and all clips/biners to XSRE's eventually.

Works pretty well so far. It stows compactly and it zips up the line quickly on ascent.
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"If you can't even clean up your own room, who the hell are you to give advice to the world?"
- Jordan B. Peterson
 
Santiago Casanova said:
I think if anybody would know it would be @yoyoman , he knows his stuff and gets into the math of it. I would not be the least bit supersized if he already calculated this during his design process.
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2-5 pounds. The SAKA mini has 2 pounds at 18" of pull and then goes to about 4-5 as it reaches it's maximum stretch.
SAKA mini is now available at Climbing Innovations website.
Video

 
treebing said:
remember that if it says 3 lbs you have to pull 3 lbs with your body. it is much preferable to pull 2 lbs. that cotton wood climb was 65 feet to to the top of the rope. if I pull two lbs 25 times that's equivalent to picking up a 50 lbs bag of cement with my body. if it were three lbs that it would be 75 lbs.
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Kevin, I'm going to have to most respectably disagree with this on the basis the science of stored energy. Now if that pull is getting dissipated for example with friction from the bungee or going thru a pulley, then it would be wasted energy. Not much is lost on a good bungee though but it must be acknowledged that some is. To visualize this imagine a small weight hanging on a Slinky as it goes up and down until it stops, putting the same weight on the bungee it will not rebound as much. This is the loss of the stored energy, a little different than kinetic energy or calories and joules.
 
evo said:
Didn’t Yo-yo go build a custom prototype reel version of the SAKA? I though he was looking into having custom fabbed units. This was about the same time when he had custome ascenders made for the SAKA. I guess something got culled durning the R&D phase. I assumed that it was a design not only to improve but to differentiate from the haas
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I did, it was called the SAKA NG, basically a retractor attached to the SAKA ascended. I had posted the videos after the provisional patent was filed, then made it private until I could get products listed for sale. Thus the SAKA mini and now current video.
 
I see what your saying and that makes sense. And my numbers are definitly off. although, I wonder how much we allow our leg to be assisted by the spring action. In this case the stronger could be better in that we would rely on the spring to pull up our leg back up the rope rather than picking up our own leg independently and just allow the spring to follow. there is some return I would think. but how much is the question. There is definitely energy lost with both the retraction reel action and the friction but there is also energy lost in the effecient return of energy into your body. You definitely put it out. do you get it back?

Whiches raise the interesting thought if you could set up a retractor reel in your body so you could redirect energy from a strong muscle groups into a smaller muscle group... allowing you super human motions like super high jumping far throwing, kicking or lifting..
 
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