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Thread: Electric Launch

  1. #1
    Join Date
    Oct 2013
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    Default Electric Launch

    I'm considering hulls that would be suitable for an electric (solar panel roof replenished) launch, perhaps 18', so I presume the place to really start is with an efficient displacement hull. Any thoughts on existing hull designs that would suit. Bay chop at the most. Fantail would be nice, deadrise also.
    Thanks

  2. #2
    Join Date
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    Default Re: Electric Launch

    Rich Jones built a Palmer launch - 17 ft, IIRC. Here's his thread on it (though there's a model thread & a repowering thread on the Palmer as well);

    http://forum.woodenboat.com/showthre...Fantail-Launch
    "If it ain't broke, you're not trying." - Red Green

  3. #3
    Join Date
    May 2015
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    Guerilla Bay, NSW, Australia
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    Default Re: Electric Launch

    Suggest you have a look at David Paynes Snapper boat design. I built one and put a 10hp diesel in her (she is 17' LOA) - easily 6 knots with 5 adults. Almost ereyone comments of the lack of wash and how she slips through the water :-) Bellas is the Teal coloured boat in this photo.

    66863024_948360368842916_5962864669411508224_n.jpg

  4. #4
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    Oct 2002
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    Coromandel, NZ
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    299

    Default Re: Electric Launch

    I built this 17' Benford "Myf" steam launch with a fantail stern in strip plank. http://www.benford.us/pcty/17fantail.html



  5. #5
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    Feb 2006
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    Default Re: Electric Launch

    I know this isn't what you had in mind, but electric drive calls for max efficiency plus lots of cabintop space to gather the solar flux. That leads my mind to multihulls.

    Bolger's Bantam, for example:

    Bantam 3.JPG

    Banta 2.jpg

    You could skip the windows if you wanted a more open-air feel, and probably extend the cabintop in all directions some to get more panels on top. The tri platform will take windage and weight up high much better than a light monohull would.

    My thoughts as a fan of multihulls when efficiency is high on the list of requirements.
    -Dave

  6. #6
    Join Date
    Apr 2016
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    Hull, QC, Canada
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    61

    Default Re: Electric Launch

    Paul Gartside published plans for an electric launch in Watercraft Magazine recently. You can get the plans and a nice little article about the design by purchasing the back issue from the Watercraft website.



    https://store.gartsideboats.com/coll...nch-design-241

  7. #7
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    Default Re: Electric Launch

    As Garret mentioned in post#2, I built a 18' Palmer launch. I got the plans from the archives at Mystic Seaport and adapted it to strip plank. I also increased the length to 18' for better efficiency. The beam is 4'6".
    For best performance of an electric hull you want at least a 4:1 ratio of waterline length to waterline beam.
    My boat had a 16' waterline and a 4' waterline beam.
    I was born on a wooden boat that I built myself.

  8. #8
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    Apr 1999
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    Hyannis, MA, USA
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    Default Re: Electric Launch

    And you may want to study up on power needs and the realities of battery recharging. Having solar capacity to recharge after a bit of a run-about is most unlikely. If you can't plug in to shore power, then a mountable wing generator coupled with deploying solar panels almost every where might work.

  9. #9
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    Default Re: Electric Launch

    A second to the wind generator. Even works in the dark.
    -Dave

  10. #10
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    Oct 2013
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    Queensland, Australia
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    Default Re: Electric Launch

    Bit bigger than 18' but anyone know this design?



  11. #11
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    Default Re: Electric Launch

    Worth looking at the Selway Fisher launches. Generally designed for steam but many have been built for electric power:

    https://www.selway-fisher.com/Steamup20.htm

  12. #12
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    Default Re: Electric Launch

    I wonder if Aroha would be a good candidate for electric power?

  13. #13
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    May 2006
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    Ballard
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    Default Re: Electric Launch

    A large umiak with a motor well would be a fun choice.
    Quote Originally Posted by James McMullen View Post
    Yeadon is right, of course.
    Quote Originally Posted by AJZimm View Post
    I basically copied what McMullen, Yeadon and Hvalsoe use because it worked so well.

  14. #14
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    Now, there's a long story...
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    Default Re: Electric Launch

    Quote Originally Posted by timo4352 View Post
    I wonder if Aroha would be a good candidate for electric power?
    According to the last email I received, they are working on exactly that!
    Heute ist so ein schŲne Tag...

  15. #15
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    Jan 2008
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    Bellingham, Wa, USA
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    Default Re: Electric Launch

    Check out these guys. Sam Devlin designed and built a nice example of a solar powered boat for them.

    https://www.solarsal.solar/
    There's the plan, then there's what actually happens.

    Ben Sebens, RN

    15' Welsford Navigator Inconceivable
    16' W. Simmons Mattinicus double ender ​Matty

  16. #16
    Join Date
    Jul 2016
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    Duluth, MN, USA
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    Default Re: Electric Launch

    Quote Originally Posted by southseas View Post
    I'm considering hulls that would be suitable for an electric (solar panel roof replenished) launch, perhaps 18', so I presume the place to really start is with an efficient displacement hull. Any thoughts on existing hull designs that would suit. Bay chop at the most. Fantail would be nice, deadrise also.
    Thanks
    I built a Redwing 18 with a cabin although the plans also detail a launch version. Itís not a fantail but itís a nice, simple and attractive plywood hull. I originally powered it with a Honda 20 but have switched to a Torqeedo Cruise 2 short shaft remote. The Honda was complete overkill. Once the ice is gone, Iíll be able to report performance. The motor is 24v and I bought 100ah of lithium batteries.

    Bill

  17. #17
    Join Date
    Dec 2009
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    Frankfort, MI
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    9,905

    Default Re: Electric Launch

    Perhaps the Ness Yawl, minus centerboard and sails, but with a motor well and a canopy top?

    Jeff C

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