Back to Search
Apollo 18
Designer: Neil Coster  ·  Builder: Prout Marine (Uk)  ·  First built: 1969
+ Add to Compare
About the Apollo 18

Built during the early days of production fiberglass sailboats, Apollo 18 represents a classic example of affordable family sailing from that era. This compact daysailer and weekend cruiser was designed to provide accessible sailing for those seeking their first taste of boat ownership or a simple platform for coastal adventures. The Apollo 18's modest dimensions make her an ideal candidate for trailering, allowing owners to explore different sailing venues without the expense of marina slips. Her straightforward rigging and uncomplicated systems appeal to novice sailors learning the ropes, while still offering enough performance to keep experienced sailors engaged on afternoon outings. Like many boats of her generation, the Apollo 18 features a traditional fin keel configuration that provides reasonable stability and sailing characteristics for protected waters and light coastal cruising. The cockpit offers comfortable seating for a small crew, while the cabin provides basic shelter and storage for day trips or overnight adventures. While detailed specifications remain scarce, the Apollo 18's enduring presence in the used boat market suggests she found favor among sailors seeking dependable, no-frills sailing at an attractive price point. Her simple construction and systems make maintenance relatively straightforward for do-it-yourself owners.

Core Dimensions
LOA (Length Overall) 18.00 ft / 5.49 m
Beam 7.50 ft / 2.29 m
Max Draft 2.50 ft / 0.76 m
Displacement 240.00 lb / 109 kg
Design & Construction
Hull Type Catamaran Twin Dbrd.
Rigging Type Cat (rotating spar)
Construction FG
Designer Neil Coster
Builder Prout Marine (UK)
First Built 1969
Owner Reviews

No owner reviews yet — be the first to share your experience with this boat.

Performance Ratios
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
29.91
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
1.56
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
4.83
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 5.24 kn
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 2.46 pounds/inch
Rig Dimensions
I (Foretriangle Height) 0.40 ft / 0.12 m
P (Mainsail Luff) 150.00 ft² / 13.94 m²
E (Mainsail Foot) Prout & Sons
How It Compares

vs. Alpha Cat 18, G Cat 57, Mirage Adventure Island Hobie, Nacra 55 18 Sq Meter, Sol Cat 18

This boat Similar boats
Dimensions
LOA
Apollo 18 ★
18.0 ft
Alpha Cat 18
18.0 ft
G Cat 57
18.7 ft
Mirage Adventure Island Hobie
16.6 ft
Nacra 55 18 Sq Meter
18.0 ft
Sol Cat 18
18.3 ft
LWL
Apollo 18 ★
Alpha Cat 18
G Cat 57
17.5 ft
Mirage Adventure Island Hobie
Nacra 55 18 Sq Meter
Sol Cat 18
18.0 ft
Beam
Apollo 18 ★
7.5 ft
Alpha Cat 18
10.0 ft
G Cat 57
8.0 ft
Mirage Adventure Island Hobie
9.5 ft
Nacra 55 18 Sq Meter
11.0 ft
Sol Cat 18
7.9 ft
Displacement
Apollo 18 ★
240 lbs
Alpha Cat 18
300 lbs
G Cat 57
360 lbs
Mirage Adventure Island Hobie
185 lbs
Nacra 55 18 Sq Meter
330 lbs
Sol Cat 18
330 lbs
Sail Area
Apollo 18 ★
Alpha Cat 18
G Cat 57
Mirage Adventure Island Hobie
65 sq ft
Nacra 55 18 Sq Meter
193 sq ft
Sol Cat 18
Performance
Comfort Ratio (higher = more comfortable offshore)
Apollo 18 ★
1.6
Alpha Cat 18
1.3
G Cat 57
1.9
Mirage Adventure Island Hobie
1.0
Nacra 55 18 Sq Meter
1.3
Sol Cat 18
1.8
Capsize Screening (lower = safer)
Apollo 18 ★
4.83
Alpha Cat 18
5.98
G Cat 57
4.50
Mirage Adventure Island Hobie
6.67
Nacra 55 18 Sq Meter
6.37
Sol Cat 18
4.59
Displacement / Length (lower = lighter)
Apollo 18 ★
29
Alpha Cat 18
37
G Cat 57
29
Mirage Adventure Island Hobie
29
Nacra 55 18 Sq Meter
41
Sol Cat 18
25
Hull Speed
Apollo 18 ★
5.2 kts
Alpha Cat 18
5.2 kts
G Cat 57
5.6 kts
Mirage Adventure Island Hobie
5.0 kts
Nacra 55 18 Sq Meter
5.2 kts
Sol Cat 18
5.7 kts
Find a Apollo 18 For Sale