I think the slippage issue is better handled by a shear pin or a clutch, as you don't pay such a high cost in reduced efficiency due to constant slippage.
Toothed belt drives don't require or benefit from dynamic tensioning, they are far more efficient, impart less side load, cleaner, quieter, last longer and are way sexier.
For shallow drive and in weeds I know of a patent on a small jet drive that was made for foldboats and canoes that worked like the Dyson blade-less fan. It was highly efficient and worked very well in shallow water and weeds. It might be worth resurrection.
--- In electricboats@yahoogroups.com, John Green <v_2jgree@...> wrote:
>
> Hi, Tim,
> Bear in mind that toothed belts also require correct tension.
> Also, if using in shallow water, where grounding might occur, or
> weed/debris is an issue, the slippage of a vee belt might be a useful
> safety feature.
> The great thing about toothed belts though, is that the smaller
> widths/sections seem in particular to be extremely flexible for the
> amount of drive capability.
>
> John
>
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