This is what I am planning and is almost completed.
Cruiser with sail assist (downwind)
12 meter (39ft long X 19ft wide+Swing wing 10 ft folded (marina).
Only 2.3 meters wide for shipping
Super efficient fast displacement
cruising speed at $5.00 /hour (aussie prices)
20 knots at $15.00/hour
Non planing and non healing, Comfortable motion.
Range 2,000 nautical miles at 10 knots
Two Petrol or two Diesel
outboards, currenly fitted
with two Honda
30 hp outboards
+Fits inside a 40ft container
+Aluminium heavy plate construction
+Trailable (on the back of a truck)
+Double decker construction for maximum room
+Large fridge and freezer
+9000 btu Air conditioning
+Large 200 amp Alternator
driven by a 13 HP Chonda,
+800 amp hour AGM battery
+Large aft deck
+Full foam insulation
for two, suitable for four
and then ship it home
Ship to Tahiti
, cruise home.
Ship to the Mediterrean,fold the outriggers (10 ft
wide)and cruise the Canals of Europe
Now to answer some of the questions.
ssullivan, thank you for your kind words.
This is NOT a planning powerboat that rides on the surface of the water, is is fast displacement
with a very narrow bow that cuts through the waves.
The angle of entry is less than half the angle of Dashews boat. Yes it will be a wet boat, and it is designed to take waves over the bow. However it will not throw a lot of spray, as even above the waterline the bow is esentially vertical but sharply angled backward.
I do not believe the boat will pound because it is not travelling on top of the waves.
However most cruising will be done at a comfortable speed according to what the weather will allow. If there is flat seas I can either cruise economically at 10 knots or 20 knots if for some reason I need to get "there" faster. I will have 500 sg ft of sail for use downwind when the wind is between 10 -20 knots. If it gets over 25 knots I will motor.
Cat Man Do "square forefoot" I agree not good but I wanted the longest waterline I could get and still fit inside a 40 ft container.
Yes Ex calif you are right exponential not linear but the resistance which is produced by a bow wave is much larger as speed increases.
A displacement hull requires 5 hp per ton to achieve displacement speed a planning boat needs a minimum of 50 hp per ton to plane
An intereresting aspect was seen in regard to the stern wave with the wedge type hull. (with the prototypes) at under ten knots the stern wave has quite large but as the water started to break from the stern (at about 14 knots) the stern wave flattened out completely, the boat actually seemed to raise up in the water a little, we achived 20knots with two large people on board a 15 ft Plywood
prototype with a 8 hp outboard
No bow wave was formed, the water flow along the sides of the boat showed little or no turbulence (which is why there was no bow wave).
Yes I think we are in love with curves, everyboy wants to have a nice looking boat. I am hoping that when my boat is on the water it will all come together and look pretty good.
Remember, the underwater surface of planning boats have been flat or deep veed, flat since 1948. (Raymond Hunt)