"My" open 70's

[Martini]

About me: I have not done any yacht design studies, nor do i know much about the design of yachts, I am a keen sailor and am fsinated by what makes a 'fast' boat... but i love design, and it takes up most of my spare time. I design on a program called "FREESHIP"

on the paramiters set buy 'the people who make the rules'
LOA 20.5m
max beam - 4.7-5.7m
disp - 13.895-14 tonn

I have come out with two designs
and want to build a scale RC boat off the 'better' one

my two designs have different wetted surface areas, block coeficiants, prismatic...etc

which is the better boat? what are all these coeficiants?
any help?

[Martini]

my design "martini 1"

Length over all : 21.500 [m]
Beam over all : 5.215 [m]
Design draft : 0.450 [m]
Appendage coefficient : 1.0000
Volume properties:
Displaced volume : 13.933 [m3]
Total length of submerged body : 21.355 [m]
Total beam of submerged body : 4.162 [m]
Block coefficient : 0.3484
Prismatic coefficient : 0.7004
Vert. prismatic coefficient : 0.5486
Wetted surface area : 60.159 [m2]
Longitudinal center of buoyancy : 9.943 [m]
Longitudinal center of buoyancy : 18.464 [%]
Vertical center of buoyancy : 0.292 [m]

Waterplane properties:
Length on waterline : 21.355 [m]
Beam on waterline : 4.162 [m]
Waterplane area : 56.433 [m2]
Waterplane coefficient : 0.6350
Waterplane center of floatation : 8.596 [m]
Entrance angle : 6.289 [degr.]
Transverse moment of inertia : 55.199 [m4]
Longitudinal moment of inertia : 1255.1 [m4]

[holdenwaca]

You work looks good. I too am not trained in design but enjoy doing it. I am designing a boat similar in concept to a Southerly swing keel between 45 and 50 feet. I haven't decided on much yet, but it will probably be constructed of foam cored carbon fiber or fiberglass. It will have twin rudders so it will be beachable. I plan to retire and sail the Great Lakes, the east coast of the US, the Bahamas and Carribean, the Keys, and the Gulf Coast. That's why I want variable draft. Keep us posted!

Will

[Landlubber]

You cannot make a n RC model boat from a real boat design, they do not work. Model boats have far deeper and heavier keels than real boats and the hulls cannot be scaled down. Look up RC boats for more info