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1987 Force 5

Listed
Expired
$427 USD

Seller's Description

Force 5, 1987 $450.00

Length 13’ 10” Beam 4’10” Weight 140lbs. Junior sail rig 62 sq. ft. dagger board, rudder and tiller in beautiful condition No trailer or dolly Sail used fewer than 6 times

Located in Morgan’s Pt. Texas near La Porte.

Similar in size to a Laser or Sunfish. The boat is more stable due to extra beam and hull shape and has a larger cockpit for extra crew. Force 5’s have the go fast adjustments of larger racing boats or can just be sailed using the mainsheet. A great boat for fun, training, and taking some friends or family out. With one sail she is easy to sail and gets on a plane quickly.

When I bought the boat I replaced the self bailer, wooded the teak and varnished and gave her a custom paint job. About three years ago a tree branch fell on the boat and punched two holes in the cockpit. They were repaired with West System epoxy and fiberglass cloth and are strong. Having a naval architect perfectionist father and having sailed since 4yrs old I am selling the Force 5 for the value of the sail and junior mast extension so that some other sailor or beginning sailor can enjoy, learn and sail while overlooking the repairs. The pictures tell it all. Grandchildren moving on to other projects.

or phone 713-248-3329

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Specs

Designer
Fred Scott, Jack Evans
Builders
AMF Corp.
Alcort
Weeks Yacht Yard
Association
Force 5 Class Association
# Built
15000
Hull
Monohull
Keel
?
Rudder
?
Construction
FG

Dimensions

Length Overall
13′ 10″ / 4.2 m
Waterline Length
13′ 2″ / 4 m
Beam
4′ 9″ / 1.5 m
Draft
0′ 3″ / 0.1 m — 3′ 1″ / 1 m
Displacement
140 lb / 64 kg
Ballast
?

Rig and Sails

Type
Cat
Reported Sail Area
91′² / 8.5 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
?

Calculations

Hull Speed
10.7 kn
Classic: 4.87 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

10.71 knots
Classic formula: 4.87 knots
Sail Area/Displacement
53.7
>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.
53.7
<16: under powered
16-20: good performance
>20: high performance
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

?
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
27.5
<100: Ultralight

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
27.46
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
2.0
<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
1.99
<20: lightweight racing boat
20-30: coastal cruiser
30-40: moderate bluewater cruising boat
40-50: heavy bluewater boat
>50: extremely heavy bluewater boat
Capsize Screening
3.7
>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
3.71
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

The FORCE 5 was designed in 1972 by Fred Scott and Jack Evans of AMF Alcort. By 1974 it was their second best selling boat. Over 12,000 boats were built up until 1989 when AMF Alcort changed hands several times in a short period of time. In 1993, Weeks Yacht Yard became the new builders of the FORCE 5.

This listing is presented by SailingTexas.com. Visit their website for more information or to contact the seller.

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