Seller's Description
$1625/BO: 1976 Sunbird sail boat, “Incitatus” (swift) swing keel for sale with galvanized trailer. Two Sails (Main and large Jib) in good condition. Also comes with storm jib that would need some work. Boat overall in really good condition. No structural issues. Needs one cam cleat replaced. Mast and boom aluminum, straight and in great shape. Draft of 10” with keel up to 3.5 feet with keel fully down. Will throw in our electric motor and brand new battery we use as backup. Fun, quick boat in 7-12 knot winds. Large cockpit listed to seat 6, but realistically, 4 adults comfortably. Trailer has new bearings, rims and tires. Have had the boat out in white caps (18-20 knots) and does really well. Email only. Link to manual: https://www.rvharvey.com/sunbird-manual.pdf Please, no more lookie loos or pretenders wasting my time. Come with cash or don’t come at all. I know what I have here and I’m willing to negotiate with others who are serious about owning a fun boat. If not, I’ll just keep her and keep the fun to myself.
Equipment: Aluminum mast and boom, tiller with kick rudder, 3 sails with lines (Main, Large Jib/small Genny and Storm Jib), electric trolling motor, new battery, anchor with 6’ of chain and 50’ rope, locking galvanized trailer with 2” cup
Specs
- Designer
- Fred Scott, Jack Evans
- Builder
- AMF Corp.
- Associations
- ?
- # Built
- ?
- Hull
- Monohull Dinghy
- Keel
- Centerboard
- Rudder
- ?
- Construction
- FG
Dimensions
- Length Overall
- 16′ 0″ / 4.9 m
- Waterline Length
- ?
- Beam
- ?
- Draft
- 0′ 11″ / 0.3 m — 0′ 11″ / 0.3 m
- Displacement
- 470 lb / 215 kg
- Ballast
- ?
Rig and Sails
- Type
- Sloop
- Reported Sail Area
- 134′² / 12.5 m²
- Total Sail Area
- ?
Mainsail
- Sail Area
- ?
- P
- ?
- E
- ?
- Air Draft
- ?
Foresail
- Sail Area
- ?
- I
- ?
- J
- ?
- Forestay Length
- ?
Auxilary Power
- Make
- ?
- Model
- ?
- HP
- ?
- Fuel Type
- ?
- Fuel Capacity
- ?
- Engine Hours
- ?
Accomodations
- Water Capacity
- ?
- Holding Tank Capacity
- ?
- Headroom
- ?
- Cabins
- 1
Calculations
- Hull Speed
- ?
Hull Speed
The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.
Formula
Classic hull speed formula:
Hull Speed = 1.34 x √LWL
A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL
- Sail Area/Displacement
-
35.3
>20: high performance
Sail Area / Displacement Ratio
A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.
Formula
SA/D = SA ÷ (D ÷ 64)2/3
- SA: Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
- D: Displacement in pounds.
- Ballast/Displacement
- ?
Ballast / Displacement Ratio
A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.
Formula
Ballast / Displacement * 100
- Displacement/Length
- ?
Displacement / Length Ratio
A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.
Formula
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
- D: Displacement of the boat in pounds.
- LWL: Waterline length in feet
- Comfort Ratio
- ?
Comfort Ratio
This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.
Formula
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)
- D: Displacement of the boat in pounds
- LWL: Waterline length in feet
- LOA: Length overall in feet
- Beam: Width of boat at the widest point in feet
- Capsize Screening
-
3.0
>2.0: better suited for coastal cruising
Capsize Screening Formula
This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.
Formula
CSV = Beam ÷ ³√(D / 64)
- Beam: Width of boat at the widest point in feet
- D: Displacement of the boat in pounds
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