20' Motorsailer

Discussion in 'Motorsailers' started by Doug Lord, Dec 29, 2008.

  1. newinertia

    newinertia Previous Member

    new pics of human propulsion and new engine

    Well I needed to fit the boat with eigther human power or a trolling motor for a backup form of propulsion- I have been mulling this design over for a few years now and yesterday morning i decided it was the time to build one, so with only the parts and supplies I had on hand, I built this.....
    The tuna fin pushed me at 1.6 mph on gps, boat is filled with a weeks worth of food and clothes, stove, 5gal water, 5 gal gas, 17hp Kohler engine, toolbox..........etc. Id say she is a fine shantyboat! the outer hulls are Hobie Cat 16, center hull is a Catalina 15 Capri. Spars under deck are 304 stainless 2"x2"
    Also- this was a float test for the amas and main hull, c/b wt/balance.
    Special Thanks to Mindy- my girl.
     

    Attached Files:

  2. newinertia

    newinertia Previous Member

    Catalina C-15

    this is what I started with.




    tags:
    Sailboat recycling sailboat conversion anti-sailboat brigs and stratton boat
    engine air cooled lawnmower engine mated to a lower unit inboard trawler mini
     

    Attached Files:

  3. rwatson
    Joined: Aug 2007
    Posts: 6,163
    Likes: 495, Points: 83, Legacy Rep: 1749
    Location: Tasmania,Australia

    rwatson Senior Member

    It may be a shanty boat, but why do you need to suffer with that extended rudder ?

    It must make it very heavy to do a tight turn
     
  4. newinertia

    newinertia Previous Member

    Thats not the rudder, thats my yuloh, they use the same mounts. why dont you read posts before putting in your self riteous two cents- and passive agressive shantyboat comments. I can call it what I want, you cant.
     
    Last edited: Apr 30, 2009
  5. newinertia

    newinertia Previous Member

    Gas consumption numbers- 30 plus mpg!

    Ok as you know, I got rid of the junk tecumseh engine because it was impossible to keep synchronized at idle speeds, wide open it was a powerhouse, but low rpm, effortless efficiency was the goal.
    I traded it out for the KOHLER Courage single cyl. 17hp. engine. (lighter)
    It produces about 4 amps of 12 volt dc current at 800 rpm, and with the reduction belt drive, I am seeing 5.4 mph at the same 800rpm. With the 10x12 prop, I wanted to do a measured fuel test, so I marked a container with accurate marks for measuring. I started with one gallon of fuel and a gps to find speed and range- its close enough for this work. Every hour I marked the level on the container- the ONE gallon container, it took me six hours and 25 minutes to burn that same ONE gallon. (6 hours 25 minutes.) GPS average was 5.2 mph, there was a 6-8 mph breeze and it was a 2-way average. the rear pontoons were removed, so it was just me and my dog and about 100 lbs of gear. top speed recorded so far was 12.2 mph- and that burns alot more! (different day) so- Im sure Im going to be called a liar by a bunch of you, but it shows that a 30 mpg boat is possible for cruising- do the math.
    and please start designing boats like this- there IS a market!!!!
     
  6. Norsehammer
    Joined: Jun 2009
    Posts: 1
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Terrace, British Columba, Canada

    Norsehammer New Member

    I love It! Do you still have the sail rig?
    It could be fitted to this vessel and you'd be motor sailing a trihull...
    There is new and different life to older boats with this kind of enginuity
     
  7. newinertia

    newinertia Previous Member

    Thanks Hammer-
    I was sold the boat and trailer for $100 because all rigging was removed, possibly stolen for crack money..... I would really like to fit it with a 12 meter kite, but they are expensive.
     

  8. newinertia

    newinertia Previous Member

    on water pic- Micro trawler

    Lake Jacomo
     

    Attached Files:

Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.