Victor, Years ago I jumped into the group trying to figure out the particulars of e-drive in my 36ft sailboat. At the time, I thought it wouldn't work but am now having quasi-sublime second thoughts, particularly as I prepare to lug the diesel out of the garage and, somehow, up into the hull. If you're rolling around on the ground saying "I told you he'd be back" well, get it all out of your system and then read on.
I'm converting my 34' sailboat, I expect to finish the project by the end of May (I travel a lot and cannot devote all the time I'd like to it). I built an aluminum frame using 4 1/2" x 1/4" angle, very easy to work with basic tools and equipment, and excelent for heat dissipation (I'll be posting pics once the project is finished).
Martin Sprocket has a great manual available on line for the HTS line, which will guide you through the selection process (I'm traveling and using a different computer, I don't have the links available with me). You attach the pulleys to the motor and propeller shafts using either QD or Taper bushings (Martin has also documentation available on line). I've designed the frame in such a way that I can switch to different sprockets and alter ratios using the same belt or using the same motor mounting holes with different belts, as I plan to keep the current propeller for the time being.
Following recommendations after posting here in the group (thanks Arby and Dennis) I went with an MRC flange bearing.
I selected the RT, and will start with 48V or 60V and if necessary add batteries to get to 72V. Weight is a huge concern (LiFePo4 batteries are way too expensive).
Alberto
Apr 21, 2010 05:39:43 AM, electricboats@
I've heard 48v is too much, just right, and of course, not enough. A local Canadian EV shop in the neighbourhood recommends 72v, but I have my doubts. Maybe I should just jump in with both feet and see what happens, so, having priced out and sourced all the parts for an Etek RT system in 48v, I now need the drive system parts. Kind souls of this forum sent good info on how to use a trailer hub for a thrust bearing (Dave?) and pillow blocks (others). My boat is steel, my medium is steel, and I've got enough scrap left over to make any kind of frame for the motor etc. I'm just a bit hung up on the pulley thing: the shaft for the Etek is 7/8 with a keyway. How do you connect this to an off-the-shelf synchronous pulley? Is there one that has range for this shaft? Where do I get it (them) to obtain decent reduction around 2:1? Please excuse my lack of power transmission knowledge.
So, if anyone's up for downloading their know-how yet one more time, I'd greatly appreciate it. In the meantime, I'll chase a few crows if that helps.
Victor
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