A reduction gear would give you more flexibility to tweak the system to best efficiency.
What is RPM of the Thunderstruck 18kW motor (12kW at 48V) running full?
Dan Pfeiffer
Your experience couldn't be better timed for me Egbert. I've just purchased the 18kw electric motor kit from Thunderstruck for a 37' Gin Fizz (pretty heavy at 9,5 tonnes). Also plan to run off a 48V battery bank. I have a thrust bearing fitted already and a variable pitch Ewol prop. I'm installing myself and in the process of designing the motor mounting bracket. I am thinking of mounting as a direct drive to the prop shaft and making pitch adjustments on the prop to get it to spin up to speed but have no experience of this at all - it just seems logical to my engineering brain. It would also be possible to install with belt drive but I thought why add the extra parts if not necessary. Alignment needs to be more accurate but I will build in some fine adjustment system to get this right.
Thunderstruck have been great so far - very responsive, they recommended this size motor - and the motor kit arrived in France from California a week after ordering!
Anyway your experience gives me some reassurance as I was wondering if the motor would be powerful enough. Let me know If I can contact you separately - I'm interested in your overall experience and what kind of set up you have - energy source, energy storage...
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