Wiser Precision Pynch Pulleys

[Travis Bertrand]

When I was the the Hunt Expo in SLC, one of the new products that really caught my eye was these tiny pulleys. They had a a demonstration set up and I just had to stop.

These little pulleys weigh in at .2 ounces each and have a rating of 1500 pounds! I had to walk away with a few. I can see multiple uses for these little guys well beyond hunting. I can see them helping get a Raft off of a boulder in a river, or having some help in lifting something in the truck. While hunting, I can see them useful in yarding up a dead animal uphill to a better spot to debone it. I can also see a use for hanging meat or a carcass as well.

I have setup the 4 pulleys with loops and still playing around on the best setup. I also want to make a loop on a longer piece of dyneema to throw over a limb.

What do you see these useful for in the field and how would you set them up?


Here is how I set it up in a 3:1 mechanical advantage with 2 pulleys.

Here is 3 pulleys that is 3.1 with a change of direction ( pulling downhill instead of up)

And here is my son demonstrating lifting a 75 pound weight

I’ll get some better pictures on the pulleys tomorrow.

 

[Travis Bertrand]

Forgot to post a link!

Pynch Pulley

Don't get caught in a pinch unprepared again! Whether you are solo hunting for big game or out with a buddy, hunting is never a scripted adventure and animals often go down in the "worst spot." FORCE MULTIPLIERWith a tensile strength of over 1,500lbs (#550 size), these pint size pulleys pack a...

www.wiserprecision.com

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[Travis Bertrand]

Here’s some better photos of the pulleys and my setup I’m playing with.

For cordage, I’m running unknown diameter of dyneema amsteel that I had laying around. I spliced the pulleys on one end and made loops on the other.

Here’s a better look at the pulleys themselves. They weigh .2 ounces each!

It is worth noting I tried running a thin diameter amsteel through the pulley and there was just a ton of resistance.


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[sportsmans challenge]

I just got a few of these last week to play with, figured they can't help you if you don't have them and at .2 oz each that is no penalty really. Will be interesting to see what you come up with. I have yet to use them, but will start playing with them soon.

 

[Travis Bertrand]

I just got a few of these last week to play with, figured they can't help you if you don't have them and at .2 oz each that is no penalty really. Will be interesting to see what you come up with. I have yet to use them, but will start playing with them soon.

Let me know how you end up setting it up! I’m not 100% sure this is exactly how I want to run mine. I would like to see one what you can attach something on each side of the pulley


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[sportsmans challenge]

Let me know how you end up setting it up! I’m not 100% sure this is exactly how I want to run mine. I would like to see one what you can attach something on each side of the pulley


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You have seen some of ( or the ) the videos frome wiser? Looked like loops through the pulleys like you did but they stacked the pulleys and on one end of the rope they anchored that and one set of pulleys then attached the other pulleys to the load and then you have your pulling end of rope.

This was mostly demonstrated in a quick video not doing loads, but you could get a feel of how they could help us out.

Will try to set up a video

 

[Travis Bertrand]

Thanks I haven’t but I’ll check it out!


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[TheTone]

Looks super cool and promising. I’m admittedly terrible and knot tying and often struggle hanging elk quarters by myself, I usually just build meat “cribs” to get them off the ground while shuttling. I can absolutely see myself using these to get a quarter hoisted up and then tie it off with another piece of cording

 

[sportsmans challenge]

Looks super cool and promising. I’m admittedly terrible and knot tying and often struggle hanging elk quarters by myself, I usually just build meat “cribs” to get them off the ground while shuttling. I can absolutely see myself using these to get a quarter hoisted up and then tie it off with another piece of cording

I was even thinking if a guy was solo or an animal got into a bad position you could use these to get it anchored/ pulled to better spot for processing or who knows.

 

[sportsmans challenge]

Here is a quick card that came with mine

 

[Travis Bertrand]

Here is a quick card that came with mine

Thanks for posting. I was going to but I am out of town and don’t have it with me. Good examples on the card and you can carry that with your for quick reference.


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[Voyageur]

Hoping those with the pulleys will chime in with more info as they use/test them.

 

[Steve O]

Definitely getting a handful of these before September. Was reading there will be a version for smaller diameter Dynema as well.

 

[Travis Bertrand]

Definitely getting a handful of these before September. Was reading there will be a version for smaller diameter Dynema as well.

I would like the smaller version!


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[sportsmans challenge]

Would be interesting to compare the sets side by side and see how they do. When playing with the 550 version yesterday and lifting a compressor they got warm, wondering how much work they could do before having issues due to the heat.

 

[BearIsBest]

I have been very curious about these - with the single ball bearing pinched in the bracket, I wonder how much the ball is actually rolling, vs the rope just sliding over the ball. I would love to see a test to see the real mechanical advantage loss due to friction in a "2:1" or "3:1" configuration.

The size of the pynch pulleys is the most intriguing factor for me, but I am a bit skeptical in regards to how efficient they are. I have used these sailing pulleys before and they have worked great -they only weigh .3oz (the pynch pulley is advertised as .2oz), but they have full ball bearings so the friction is greatly reduced:

Ronstan Sailboat Hardware | USA | Ronstan Sailboat Hardware USA

With over 69 years of experience in producing high quality marine equipment, Ronstan today is proud to offer over 2000 products developed for all diverse types of sailing.

www.ronstan.us

I have also been curious about just using low friction rings (also used a lot in sailing), to set up a fully sliding pulley system (no rolling, rope just slides through rings). Five of these weigh as much as a single pynch pulley or sailing ball bearing:

Ronstan Sailboat Hardware | USA | Ronstan Sailboat Hardware USA

With over 69 years of experience in producing high quality marine equipment, Ronstan today is proud to offer over 2000 products developed for all diverse types of sailing.

www.ronstan.us

Cost of all three is about the same ~ $14-16. Thoughts?

 

[sportsmans challenge]

I have been very curious about these - with the single ball bearing pinched in the bracket, I wonder how much the ball is actually rolling, vs the rope just sliding over the ball. I would love to see a test to see the real mechanical advantage loss due to friction in a "2:1" or "3:1" configuration.

The size of the pynch pulleys is the most intriguing factor for me, but I am a bit skeptical in regards to how efficient they are. I have used these sailing pulleys before and they have worked great -they only weigh .3oz (the pynch pulley is advertised as .2oz), but they have full ball bearings so the friction is greatly reduced:

Ronstan Sailboat Hardware | USA | Ronstan Sailboat Hardware USA

With over 69 years of experience in producing high quality marine equipment, Ronstan today is proud to offer over 2000 products developed for all diverse types of sailing.

www.ronstan.us

I have also been curious about just using low friction rings (also used a lot in sailing), to set up a fully sliding pulley system (no rolling, rope just slides through rings). Five of these weigh as much as a single pynch pulley or sailing ball bearing:

Ronstan Sailboat Hardware | USA | Ronstan Sailboat Hardware USA

With over 69 years of experience in producing high quality marine equipment, Ronstan today is proud to offer over 2000 products developed for all diverse types of sailing.

www.ronstan.us

Cost of all three is about the same ~ $14-16. Thoughts?

I like the idea of the 1st set having the bearings, after playing with the pynch the other day they got warm. Would be interesting to see a comparison of them to the ones you posted

 

[BackcountryNC]

I recieved some of the Pynch Pulleys and did my own testing for efficiency. They didn't impress me. See below:

I setup a 2:1 and 3:1 in a block and tackle setup using good quality 550 paracord. I was pulling down to lift a load of 50lbs (rove to disadvantage) just like I would to hang quarters.

Using my bow scale the load (dumb bells) measured 48-50lbs without mechanical advantage. In a 3:1 setup I had to get the rope tension to ~43-45lbs before I could lift the load. Once suspended the rope tension was almost exactly 16lbs as you'd expect. To lower the load the rope tension gets to nearly 0lbs before it starts to lower.

In a single pulley lift (no mech advantage) the rope tension hit a staggering ~70lbs before I could get the 50lb load to lift. This is with nearly 180 degree wrap.

I also tested 75lb load lift in a 3:1 setup and felt like I could barely get it off the ground even with a t-handle. Rope tension hit ~66lbs before it came off the ground.

My findings align with this website which shows throwing a line over a 0.5" diameter carabiner with no sheave provide ~54% efficiency. I think due to the small size of the Pynch Pulley ball bearing you end up with a similar result.

Pulley size and rope stretch — Alpinesavvy

Pulley diameter and rope stretch do affect your hauling efficiency. It’s more relevant to mountain rescue teams and big wall climbers than to alpine climbers.

www.alpinesavvy.com

 

[BackcountryNC]

I recieved some of the Pynch Pulleys and did my own testing for efficiency. They didn't impress me. See below:

I setup a 2:1 and 3:1 in a block and tackle setup using good quality 550 paracord. I was pulling down to lift a load of 50lbs (rove to disadvantage) just like I would to hang quarters.

Using my bow scale the load (dumb bells) measured 48-50lbs without mechanical advantage. In a 3:1 setup I had to get the rope tension to ~43-45lbs before I could lift the load. Once suspended the rope tension was almost exactly 16lbs as you'd expect. To lower the load the rope tension gets to nearly 0lbs before it starts to lower.

In a single pulley lift (no mech advantage) the rope tension hit a staggering ~70lbs before I could get the 50lb load to lift. This is with nearly 180 degree wrap.

I also tested 75lb load lift in a 3:1 setup and felt like I could barely get it off the ground even with a t-handle. Rope tension hit ~66lbs before it came off the ground.

My findings align with this website which shows throwing a line over a 0.5" diameter carabiner with no sheave provide ~54% efficiency. I think due to the small size of the Pynch Pulley ball bearing you end up with a similar result.

Pulley size and rope stretch — Alpinesavvy

Pulley diameter and rope stretch do affect your hauling efficiency. It’s more relevant to mountain rescue teams and big wall climbers than to alpine climbers.

www.alpinesavvy.com

UPDATE:

I'm in contact with Wiser to see if the ones I recieved are faulty in any way. BTW they have been incredibly supportive and great to deal with so far.

 

[sportsmans challenge]

That sounds about similar to what I experienced, glad you threw a scale to it. A 5:1 didn't feel 1/5th the weight at all