Monday, August 20, 2012

Re: [Electric Boats] Lewmar bow thrusters & intro

 

The question is how much will you want to spend on batteries.
 
The Penobscot 17 is a pretty boat with a hull speed around 5.3 knots.
 
With $10,000 invested in lithium batteries, you could travel all day and a long way long way at something like 2/3 hull speed (<4 knots).
 
For a total investment of under $3,000 you will find the useful range/speed limited to around 1/3 hull speed (<2 knots).
     (Figure a Torqeedo 1003 with an extra battery pack)
 
You might get another knot or two out of a twin hull design of the same length. Something like Slider might be fun for two people.  http://slidercat.com/blog/wordpress/?page_id=2
 
 
Sent: Sunday, August 19, 2012 1:38 PM
Subject: [Electric Boats] Lewmar bow thrusters & intro
 
 

Hi

I'm a new member with aspirations to build an electrically powered boat to cruIse the coastal waters around Oahu with one passenger. I live on the North Shore of Oahu.

•The boat
Haven't started building yet, but am pretty committed to a Penobscot 17 from Arch Davis (archdavisdesigns.com). The theory being that an easily driven sail/row boat is a good candidate for electric construction, and the 17 is large enough to be comfortable and handle some chop.

• The power
Lots of questions and options here. I have read with interest the many discussions of inboard vs outboard vs trolling motor comparisons. However, I haven't seen (but may have missed, you guys have _lots_ of posts--interesting, but a bit daunting) discussion on thrusters for primary propulsion. Nothing definite yet, but would appreciate discussion of the Lewmar 185TT from WMJ Marine (wmjmarine.com). Don't want to exceed hull speed, but don't want to be "full throttle" the entire time I'm out.

Any feedback?

Stan

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