Hi My project this year is to build a small displacement electric boat. The base will be a fibreglass Nordic 17, 17 feet O/A and a displacement of 1.4 tonnes. The Nordic is a traditional double ended design originally fitted with a 10hp Bukh diesel. After several months of research for a drive system my best option at the moment is a 6000 watt QS Hub motor (1400 RPM 72Volt) and a APT 96600 sinusoidal controller. On the keep it simple theory it appears easy to connect the prop shaft via a polyflex shaft coupling to the 5x100 PCD wheels studs on the hub. This is direct drive. The hub motor will be fitted in a custom aluminium mount with polyflex engine mounts. A LiFePO4 battery pack will fitted as low as possible in the keelson area forward of the engine bilge. Am I missing something but why are all the kits available using high RPM motors which require reduction and avoidance of axial thrust loads. The hub motors you would expect are designed for axial loads as experienced in cornering of the vehicle. Also I would expect reasonable and adequate splash/dust protection from a hub motor. Additionally the disc brake rotor could be removed and replaced with a fan blade for increased cooling and ventilation. As I said I may be missing something and welcome advice and experience from this excellent knowledgeable forum.
Posted by: mryanqld@gmail.com
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