Seller's Description
1984 S2 7.9 Grand Slam fractional rigged trailerable racer/cruiser
Boat has been lovingly cared for, and recently upgraded throughout. This is hull 399 and after the blistering issues of the earlier models.
This boat early on had the full sternrail upgrade done.
Boat core is very dry. Mast step has already been upgraded.
Mast rewiring was done 2024.
Cushions are original tan with navy pinstripe but look great (prior owners kept inside storage year round)
Hull has not been painted, original rare tan color with green trim
Trailer is road worthy, although brakes do not work (lights are all working and tires are good).
Equipment: 2024 VHF and RAM 4 remote mike 2024 Kicker Bluetooth stereo 2024 Kicker rail mount speakers 2023 amsteel synthetic lifelines 2023 running rigging 2024 LED anchor light 2024 LED steaming light 2024 Shakespeare VHF 3db antenna at masthead 2023 Folding 300lb capacity swim ladder with backer plates 2024 Raymarine wired windspeed and direction i60 2024 Raymarine wired i50 tridata (Speed, depth, Temp) 2024 Rudder bushings 2023 Raymarine ST2000 tiller pilot 2023 tiller rebuilt 2023 tiller extension 2023 Boomkicker 2023 New Bomar forward hatch
Windward sheeting traveler Standard traveler included (and upgraded harken T track)
Upgraded Winches Secondaries are 2 speed Self tailing 1 primary is self tailing other primary is 2 speed.
Flicker added 2024 Amsteel synthetic backstay, cascaded and led forward
Multiple sails convey. Two dacron mainsails, one original, one performance. Then one laminate North 3DL for practice
Multiple headsails, at least 3 number 1 headsails (laminate), at least 2 number 3 Headsails (laminate), one North spinnaker (shown)
original wire backstay, and multiple boom covers convey Lots of spare parts convey as well.
Boat in water ready to sea trial. Boat will remain in water until deposit in hand.
Specs
- Designer
- Graham & Schlageter
- Builder
- S2 Yachts
- Associations
- ?
- # Built
- 545
- Hull
- Monohull
- Keel
- Lifting
- Rudder
- ?
- Construction
- FG
Dimensions
- Length Overall
- 25′ 11″ / 7.9 m
- Waterline Length
- 21′ 8″ / 6.6 m
- Beam
- 8′ 11″ / 2.7 m
- Draft
- 1′ 1″ / 0.3 m — 4′ 11″ / 1.5 m
- Displacement
- 4,250 lb / 1,928 kg
- Ballast
- 1,680 lb / 760 kg
Rig and Sails
- Type
- Sloop
- Reported Sail Area
- 325′² / 30.2 m²
- Total Sail Area
- 325′² / 30.2 m²
Mainsail
- Sail Area
- 180′² / 16.7 m²
- P
- 29′ 5″ / 9 m
- E
- 12′ 2″ / 3.7 m
- Air Draft
- ?
Foresail
- Sail Area
- 145′² / 13.5 m²
- I
- 30′ 6″ / 9.3 m
- J
- 9′ 6″ / 2.9 m
- Forestay Length
- 31′ 11″ / 9.7 m
Auxilary Power
- Make
- ?
- Model
- ?
- HP
- ?
- Fuel Type
- ?
- Fuel Capacity
- ?
- Engine Hours
- ?
Accomodations
- Water Capacity
- ?
- Holding Tank Capacity
- ?
- Headroom
- ?
- Cabins
- 1
Calculations
- Hull Speed
-
7.6 kn
Classic: 6.24 kn
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
-
19.8
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
-
39.4
<40: less stiff, less powerful
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
-
186.1
100-200: light
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
-
15.3
<20: lightweight racing boat
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
-
2.2
>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
Notes
A few (17) were delivered with a fixed keel and masthead rig. (See S2 7.9FK for specs.)
Inboard power available as an option… BMW 7.5 hp diesel.
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