Timeline for Will this pulley arrangement keep this kayak level when hoisting?
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 31, 2020 at 22:39 | comment | added | Bohemian | Won't work. There is always some friction. Two separate ropes is the only way. | |
| Aug 31, 2020 at 15:36 | comment | added | Carl Witthoft | This can work but it does depend on not much friction in the system | |
| Aug 31, 2020 at 7:56 | comment | added | Criggie | I've got a bike lift that does exactly this. The bike goes up mostly level, and if it gets too far out of level you give it a shove with one hand. When the bike (kayak) gets up the top it will run out of travel on one side, which will level it up nicely. Given most kayaks bulge in the middle, it would take some serious angle for it to drop. OP should clip the mooring line to the lifting line anyway, as a second backup but its really gilding the lily. | |
| Aug 30, 2020 at 18:13 | comment | added | Makyen | As with all single rope solutions, this could work in an ideal situation (up to some height; see previous comment by Harper), but usually ends up unbalanced in the real world, due to friction and an assumption that the load is perfectly balanced. This type of solution will tend to result in one side rising more than the other (usually the side closest to where the rope is being pulled), and be frustrating to correct. | |
| Aug 30, 2020 at 18:08 | comment | added | Harper - Reinstate Monica | I see what you're doing to try to control pitch, but it has a couple of problems: first you need a lot of spread to have those balancing forces be meaningful (and getting the outer pulleys that spread in a typical garage may not be possible), and second, what increases balancing force also makes lifting force (as well as side force on end tie-off and outer pulley) exponentially increase as you get the kayak near the top. It won't be possible to lift it to design height. | |
| Aug 30, 2020 at 17:05 | history | edited | jpa | CC BY-SA 4.0 |
note about spacing
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| Aug 30, 2020 at 16:53 | history | answered | jpa | CC BY-SA 4.0 |