I don't remember if the Thunderstruck kit has a reduction gear or not, but you will probably want one somewhere in the 2:1 to 3:1 range. You need to figure that out. Or just wing it, trying different pulleys until your rated (or desired) top continuous motor current gives you your cruise speed or a bit more. You may wat that power cushion for getting off a lee shore or stemming a heavy tidal outflow, for instance. You also need a thrust bearing, and most reduction gear setups already have a thrust bearing.
FWIW I am currently running a 5kw motor, 2:1 enclosed gearbox, and 14x10, 3 blade prop in my Cal 2-27 which is just a bit heavier than your boat and a bit beamier. I also have a 12kw motor that I used briefly before my prop change and performance figures were actually nearly equal. I have a 48v bank, which is the most common voltage for this size boat. My entire conversion was somewhere north of $2k, after selling my old Atomic (still running) for I think $400.
One problem with kits is the cable size. You really should go with at least size 0 cable and I used 2/0 welding cable for all battery connections and the phase wires.
You will have to build a mount, also, to mate the propulsion unit to your engine bed stringers. 2" or 3" angle iron works well for this, either bolted together or welded.
Keep shopping and researching. It is not unusual to spend a couple of years planning an electric conversion.
| Reply via web post | • | Reply to sender | • | Reply to group | • | Start a New Topic | • | Messages in this topic (2) |
No comments:
Post a Comment