Marples Design 109
Description
John Marples (born 1944), a renowned American multihull designer and mechanical engineer (B.S. from California State Polytechnic University), has created over 40 sail and power vessel designs ranging from 7 to 64 feet, often in collaboration with Jim Brown. His work emphasizes wood/epoxy construction, seaworthiness, and practicality for both pleasure and commercial use, with specialties in trimarans and catamarans using innovative techniques like Constant Camber (a curved-panel method for lightweight, strong hulls). Designs are sold as plans through Marples Marine, with consultation services available. While detailed public records of every design number are limited (as many are custom or commercial), Design #109 appears to be a private or lesser-documented project in his catalog, potentially a trimaran or catamaran variant based on his typical numbering system for Constant Camber (CC) series (e.g., CC26, CC37). No specific name, length, or specs for #109 were found in available sources, suggesting it may be an early or custom sailboat design from the 1970s–1980s era of his Searunner or Constant Camber lines.
The standard boat dimensions
| i | 42 ft |
|---|---|
| j | 16 ft |
| p | 42 ft |
| e | 15.50 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 42 ft | 16 ft | 42 ft | 15.50 ft | - | - | - | - |
Blueprints
Sails
Marples Design 109 - MAINSAIL
| Luff | 42 ft - (12802 mm) |
|---|---|
| Foot | 15.5 ft - (4724 mm) |
| Leech | * 44.09 ft - (13439 mm) |
| Tack Angle | * 88.01 ° |
| Diagonal | * 44.26 ft - (13490 mm) |
| Head (inches) | * 6 in - (152 mm) |
| Area | 325.15 ft² |
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Marples Design 109 - JIBSAIL
| Luff | 34 ft - (10363 mm) |
|---|---|
| Foot | 18.17 ft - (5538 mm) |
| Leech | 26 ft - (7925 mm) |
| Length Perpendicular | 13.72 ft - (4182 mm) |
| Area | 233.22 ft² |
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Marples Design 109 - GENOA
| Luff | 43 ft - (13106 mm) |
|---|---|
| Foot | 22.83 ft - (6959 mm) |
| Leech | 40 ft - (12192 mm) |
| Length Perpendicular | 21 ft - (6401 mm) |
| Area | 451.5 ft² |
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Marples Design 109 - SPINNAKER
| Stays | 48 ft - (14630 mm) |
|---|---|
| MidGirth | 36 ft - (10973 mm) |
| Foot | 36 ft - (10973 mm) |
| Area | 1468.8 ft² |
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Disclaimer. Boats are not all the same -- even when produced in the same factory of the same model. Sailrite does its best to publish accurate dimensions, but we often find it worthwhile to have our customers measure their boats carefully before we produce kits for them. You should take the same precautions, especially when the data is not from Sailrite. The information on this site is not guaranteed to be accurate. Sailrite offers this content as a service to our community, but takes no responsibility for the reliability of the data provided.