[quote=revintage]I have the same problem, sailing alone and also being a little older. You must do the math first. The ones you suggest are total overkills.
As I at the moment am building a motorized jockey wheel and a light weight beach trolly, I have the figures. With 400lb+jockey wheel+trolley, you don´t need over 1kN(ca 200lbf) to pull the combo up a 10 degree ramp. The ramp I use is 7 degrees and from concrete and should only need below 0.5kN. Also remember you will add quite a few lbf pull yourself 8-) !
I am building my from a 2000lbs 1800W 12V car winch and a standard 260mm jockey wheel. Max pull is 1200-1700Lbf depending on choosen gearing, I have two different wheel sprockets to chosse from. There are numerous versions for pulling trailers on Youtube.
With a descent weight on the jockey wheel there will be no problem with wheel spin, if the ramp is asphalt or concrete, though loose sand can be a problem. With the trolley wheels at or just rear of the shroud chainplates, my Nacras give enough weight at the front.
The puncturefree low cost wheel I have will probably need to have grooves cut in it. It will also need a few screws between rim and tyre to prevent slip.
[img]http://soderquist.se/vinsch.jpg[/img]
[img]http://soderquist.se/hjul.jpg[/img]
[img]http://soderquist.se/katvagn2.png[/img]<!-- editby --><em>Edited by revintage on Nov 12, 2021 - 08:22 AM.</em><!-- end editby --> [/quote]
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