Chains are problematic in a boating environment since they need lubrication and they rust. There is not need to use shifters in a boat, so that feature is moot. And, at higher speeds, like running over a small motor sprocket, they generate noise. They aren't horrible, but they aren't ideal, either.
--- In electricboats@
>
> danbollinger wrote:
> > Cogged/synchronous belts are in the 96-99% efficiency range, so don't discount them. They are lighter, and don't need lubrication.
> >
> >
> Cyclists are still largely using chains and a mechanism to bodily rip
> the chain from one cog to another to change gear as the efficiency of
> the simple belt/chain transmission/
> The chain systems are in the high 90s% efficient. The hub gear systems
> tend to be some what lower - mid 80s to mid 90s% efficient.
> Like our e-boats, cyclists want maximum power transfer with the minimum
> of transmission losses.
>
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