Hmmm, I think there's possibly something wrong with the (upper end at least) numbers. Those speed-kW numbers would indicate a linear relationship, at least to 9.5kn and there's no indication at that speed of it going non-linear.
While narrow cats don't have the oft cited hull speed issues, I can't see the speed-power required being linear in the upper range.
I wonder whether they're calculated or observed...
On Mon, 12 Aug. 2019, 3:33 pm stevetull14@gmail.com [electricboats], <electricboats@yahoogroups.com> wrote:
Sunreef has just released a 50ft Catamaran with Electric Engines from EPTechnologies, a Danish company. - From EPTechnologies website , it specifies:
- 2x 35kw IPM engines
- 77kw lithium NCM batteries
- 25kw DC generator
- 17kw AC generator- Top speed 9.5 kts, 1h on batteries or 100min whit the DC generator
- 8kts on 40 kw, 90min on batteries or 3h whit dc generator
- 7kts on 30kw, 2h on batteries or 6h whit DC generator- 6.5 kts on 22 kw, as long as there is diesel.See http://https://eptechnologies.dk/catamarans/ for more information. Keen to hear everyone's feedback.
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Posted by: Robert McArthur <rjmcarthur@gmail.com>
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