Balanced rigid solar panel sail on a Wharram Tiki 38. The values below are calculated in the page by sail/sail.js from boat/params.json and sail/params.json, and update when either file changes. The 3D viewer shows the values that change with turn, tilt, pivot and sun.
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| Design |
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| Designers |
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| Length overall / waterline |
/ |
| Beam overall / each hull |
/ |
| Draft |
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| Displacement, light / full cruising |
/ |
| original sail area (two masts) |
m² |
measured from the study plan (sheet S46), positions from the stern tip:
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| Bridge deck, forward of the aft mast |
– ( long), wide |
| Bridge deck height above waterline |
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| Beams 1–5 |
m (beam 3 is the short one at the deck pod front) |
| Centre deck (measured) |
long, wide, below the engine boxes and fore deck |
| aft mast foot |
on beam 3 at , raked aft , above deck |
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| Modules |
× = bifacial, × , Wp each; forward and aft of the tilt drive |
| Peak power |
kWp (back face counted at ) |
| Frame |
× |
| Camber |
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| Sail area / module area |
m² / m² |
| Share of the original rig |
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| Drive gap between the halves |
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| Tilt end stops |
±° |
default pivot: forward of the aft mast, above the fore deck.
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| Pivot range (base on the chosen foundation) |
– forward of the mast |
| Pivot position where the roof clears the aft mast |
forward of the mast |
| Pivot position that always clears the aft mast |
forward of the mast (margin ) |
| worst aft mast gap at the default pivot |
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| largest sweep radius (dashed ring) |
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| Sail to column, sideways |
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| clear height under the roof |
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| at the tilt end stop: lowest point above deck |
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| at the tilt end stop: highest point above waterline |
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| Type |
2 × worm slewing drive with 24 V DC motor |
| Ring diameter |
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| Mass |
each, total |
| Turn drive |
on the foundation (see below), base plate × , output above the deck with the default foundation |
| Tilt drive |
on the rotating column, above the deck, between the sail halves |
Default: (switchable in the 3D viewer). Forces are for the ultimate design loads: tipping, twist about the vertical and vertical, with the pivot forward of the aft mast.
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box between the twin spars |
twin spars, saddle beam |
twin spars with pyramid |
Pyramid on the single foot |
| Turn drive base above deck |
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| Pivot range forward of the mast |
– |
– |
– |
– |
| Spars |
2 × × , apart, closed into a box at the pivot |
same |
same |
original single foot |
| Force pair on the spars |
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|
– |
| Spar bending / stress |
/ MPa |
same |
same |
– |
| Load into beams 4 / 5 (alternating) |
/ |
same |
same |
– |
| Twist as a force pair |
taken by the closed box |
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|
– |
| Pyramid footprint |
– |
– |
× |
× |
| Leg angle / axial force |
– |
– |
° / |
° / |
| outward thrust per foot |
– |
– |
(taken by the spars) |
(taken by the base ring) |