Hi Paul,
Thank you for the suggestion which reinforces the perspective from another member who suggested the same in an email to me.
The inboard generator is also an option, however I feel that it would defeat the purpose of removing a petrol plant and use an electric one. This would only add another petrol plant in the picture. What do you think? Would there be an advantage I did not see?
The large movement of the tail and the supply leads would indeed be an issue. Perhaps the design could run the cables, with some appropriate slack, close to the long tail swivel and then run them all the way up to the motor?
And thank you for the hint about the Mars Motors. Could you share with me more specifically what was the issue with them?
I will look for Arby and maybe send him a mail.
Best Regards,
Christian
--- In electricboats@
>
> Christian,
> As I have spent a lot of time in Thailand and know the long tail boats and their aplications very well, I would suggest that you keep the long tail principle and ad an inboard generator for your battery charging and run the tail motor as well, your only problem you will have to deal with is the large movement on the tail and the supply leads. In this group there is a guy named Arby, very help full and I am sure between the two of you you can work something out. Because of where you are and past experience I would not suggest you look at the Mars motors.
> Good luck,
> Paul.
> ----- Original Message -----
> From: cpatouraux
> To: electricboats@
> Sent: Thursday, April 22, 2010 7:35 PM
> Subject: [Electric Boats] Conversion of Traditional Thai fishing boat to Electric
>
>
>
> Hello,
>
> I have a small charity shipyard in Thailand where we build boats for fishermen.
> I have been doing this since the tsunami which I lived through in 2004 and so far we have already built 88 of those boats.
>
> Those boats are usually called "long tail" boats because they use engine mounted on a swivel on the aft deck and a long shaft driven straight into the water from the deck. I will try to post a few pictures.
> Now most of those coastal fishermen are no longer using the boats because the fuel price has become too high to pay with the sales of their catch.
> We successfully converted one of those boats to a sailboat last August, but the issue is that most fishermen are.. well.. fishermen and not sailors.
> So now I am considering the electric option and any help, guidance and advice would be very welcome.
> The boats are somewhere between 30 and 40 feet and the engines that we have been using were 11HP Yanmar, so I think I could replace those with a 5kW with similar max RPMs as the Yanmar and use the same propellers. My idea would be to build an inboard motor and drive the shaft straight through the stern and use a rudder. The power would come from LFP batteries.
> Those boats cannot have a propeller shaft or a drive protruding under the hull because they rest on the sand at low tide.
> My main concern with all this is what parts to use and especially how to protect them from seawater.
> I have tried procuring a 5kW BLDC motor from China through the sites Alibaba and Globalsources for the last 2 months but they are unable to demonstrate their quality, give me efficiency curves, etc... so now I have turned to US products and started the search a few days ago. But I am quite concerned as to how how protect the assembly from seawater.
> I managed to secure good LFP batteries at $1.5 per AH so at least that s good.
> So once again, any suggestions and recommendation on what parts to use, would be most welcome. Oh and yes, it is a charity, so my budget is limited for this prototype. Probably less than 3 thousand US without the batteries.
>
> Thank you..
> Christian
>
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