08-28-2018, 01:16 PM
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#41 (permalink)
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EcoModding Apprentice
Join Date: May 2008
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It is easier to trade for a sailboat than to get a planing hull to sail well. I have seen a few small yachts converted to fishing, and they do have efficient hulls. A catamaran might be the preferred type, or a monohull with a daggerboard so you can lose the keel drag when it isn't needed.
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08-28-2018, 01:19 PM
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#42 (permalink)
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It's all about Diesel
Join Date: Oct 2012
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Quote:
Originally Posted by vxhatch
buy a newer motor, consider the evinrude DFI 2-stroke E-TEC line, they are lighter than 4-strokes and get equivalent, if not better FE
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Their FE is often claimed to be better than 4-strokes. Well, at least it used to be when most 4-strokes still relied on carburettors... |
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08-28-2018, 04:40 PM
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#43 (permalink)
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Diesel Trucker
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JD - '04 Dodge Ram 2500 QCLB 4x4 SLT Last 3: 18.93 mpg (US)
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Quote:
Originally Posted by Angel And The Wolf
What's a boat?
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Hole in the water you pour money into. 
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Dodge Ram '04.5, 2500 HO, Auto, QCLB, 4x4, CAI, 4" turbo back, Smarty Jr, Airdog 100. So Far
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08-28-2018, 06:26 PM
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#44 (permalink)
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EV OR DIESEL
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Quote:
Originally Posted by rdefayette
Hole in the water you pour money into. |
Actually, my experience is BOAT stands for “Bust Out Another Thousand” . Which means that I’m getting off cheaper than most.
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08-28-2018, 06:32 PM
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#45 (permalink)
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Vixen21, Smart fortwo cdi
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Hull design stability vs speed/efficency
Hull design:
The big trade off in kayaks is stability, versus speed/efficiency.
Sea Kayaks with long slender hulls follow same rules as a wind tunnel.. cut your water path and release it slowly.
Kayakers are loose in the hips, letting the kayak wobble as the upper torso stays squared with water horizon.
If you mount a small diesel engine on a Sea Kayak and keep it at peak torque rpm you may experience amazing Mpg. Or you might flip and drowned!
Jack
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08-28-2018, 08:45 PM
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#46 (permalink)
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EV OR DIESEL
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I’d say if your going as efficient as a Kayak just go ahead and go electric. Trolling motors are often free, or do something with higher speed if you are so inclined.
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08-29-2018, 08:42 AM
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#47 (permalink)
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Vixen21, Smart fortwo cdi
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For a Kayak ,an electric motor might be a good idea!
12 V lithium ion battery packs are light weight and Powerfull.
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08-29-2018, 02:06 PM
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#48 (permalink)
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EcoModding Lurker
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FE for a boat
I had a 18 ft aluminum boat full top with a 60 horse four stroke fuel injected motor
I could put 5 gallons of gas in the boat and troll all day
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08-30-2018, 12:12 AM
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#49 (permalink)
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Master EcoModder
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Quote:
I had a 18 ft aluminum boat full top with a 60 horse four stroke fuel injected motor
I could put 5 gallons of gas in the boat and troll all day
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You might get a few bites with that.
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08-31-2018, 05:27 PM
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#50 (permalink)
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Master EcoModder
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Quote:
Originally Posted by euromodder
Got a picture ?
Google turns up some really squarish shallow draft boats
A newer engine will likely get you better mileage
Clean the hull
Paint & polish it really smooth & glossy
Add "stern plates"
Dunno what they are really called, but they are plates added aft of the stern, along the underside of the hull, and extend the apparent length of the hull
Increase the fineness ratio: make it longer, or narrower |
I just learned why warships have always had a squared off stern. The tapered would be more efficient but the square is faster and efficiency isn't as big of a concern. That square creates a high pressure area where the prop is giving it more bite and less cavitation. Therefore a little more top speed at the expense of less efficient.
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