I was happy with the original motor but felt a bit more grunt for use outdoors on the lake. Researching the subject on-line some builders use 5 coils of copper pipe and this seems to be the key to more power.
5 coils can be made from a single tube but the jets have to be made separately. As it happens this suited me as they now run through the plank itself and support the coil.
The heating element also needed refining. The first plan was to use a tealight candle. While this works it's a bit weak for the amount of copper involved now, Dropping a bit of firelighter into the used aluminum holder sorted this but that doesn't last very long.
Finally I've nicked an idea from a web site and made a burner up from a plumbing fitting. The fuel is still up for debate as meths works but I'm wondering if lamp oil will last longer.
Whatever else happens, on the pool the vessel certainly works. Once the coil warms up properly it's got a surprising amount of speed !
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