Made to measureIllustration. Yours is cut to this boat’s measurements.Cloth
Battens
Build time
Express +8%, economy 5.5% off. Shown as its own line in your cart.
A$2,217.60
inc GST
Sirius 31 Sails Prices, sail sizes & rig dimensions
8 products cut or sized for this boatI 11.76 · J 3.65 · P 10.55 · E 3.73 mPrices checked 22 Oct 2026
Made to measureIllustration. Yours is cut to this boat’s measurements.
Made to measureIllustration. Yours is cut to this boat’s measurements.Cloth
Size (LP)
UV cover colour: Captain Navy
Build time
Express +8%, economy 5.5% off. Shown as its own line in your cart.
A$2,403.50
inc GST
Sized for this boatRacing with a pole? Symmetric spinnakers from A$1,448.70
Asymmetric spinnaker
Asymmetric Spinnaker · Size 3 (50 m²)
Matched to the Sirius 31 fore-triangle · 0.9 oz nylon · 11 colours
Spinnaker cloth colour: White
Sock outer tube
Sock inner tube
The sock goes in your cart as its own line, linked to this spinnaker.
A$1,628
inc GST
Fits the Size 3 spinnaker
Dousing sock
Spinnaker Dousing Sock · 10.8 m
UV-resistant ripstop nylon sock to hoist and douse the spinnaker from the deck
Outer tube
Inner tube
A$665.50
inc GST
OSR max 6.9 m²Storm jib
Storm Jib · Medium (5.7 m²)
Storm orange Dacron · World Sailing OSR 4.26 sizing for this rig
Luff attachment
Luff tape relies on a foil, so it does not meet the OSR luff-attachment rule. Choose hanks or wrap luff for offshore racing.
A$711.70
inc GST
OSR max 6.9 m²
Luff hardware
Tell us your track size after you order.
A$713.90
inc GST
Fits a 3.73 m boom
Canvas
Colour
A$478.50
inc GST
Fits a 3.73 m boom
Canvas
Lazy jacks
Colour
A$918.50
inc GST
Get the price list
Every Sirius 31 price on one printable page: mainsail and genoa in each cloth, the spinnaker, sock, storm sails and canvas, plus the rig dimensions.
Not ready to buy yet?
Sirius 31 rig dimensions
| Measurement | Metres | Feet |
|---|---|---|
| I (fore-triangle height) | 11.76 | 38.6 |
| J (fore-triangle base) | 3.65 | 12.0 |
| P (mainsail luff) | 10.55 | 34.6 |
| E (mainsail foot) | 3.73 | 12.2 |
| Mainsail area | 23.0 m² | 248 ft² |
| Fore-triangle area | 21.5 m² | 231 ft² |
| Length overall (approx.) | 9.45 | 31 |
We confirm your measurements before anything is cut.
Sirius 31 sails: questions
How much is a new mainsail for a Sirius 31?
From A$2,217.60 in Dimension-Polyant Optimum Cruise with 3 leech battens and a full-length head batten, or A$2,390.30 with 4 full battens. C-Breeze, the long-life cloth, starts at A$2,946.90. Every mainsail is cut to the Sirius 31 rig (P 10.55 m, E 3.73 m) with two reefs.
What size genoa does a Sirius 31 need?
We build 110% to 150% LP for the standard rig (I 11.76 m, J 3.65 m). Pick a smaller genoa for a windy home port and a larger one for light-air sailing. Furling genoas start at A$2,033.90.
What size spinnaker fits a Sirius 31?
A Size 3 (50 m²) asymmetric suits the Sirius 31 fore-triangle. It starts at A$1,628, or A$2,293.50 with a dousing sock.
What size storm jib and trysail fit a Sirius 31?
The Offshore Special Regulations cap a storm jib at 5% of I squared (6.9 m² here) and a trysail at 17.5% of P × E (6.9 m²). That makes our Medium (5.7 m²) storm jib and Small (6.1 m²) trysail the right sizes.
How do I check my boat matches these measurements?
Measure I, J, P and E and compare them with the rig table. We confirm every measurement with you before the sail is cut.
From the same loft
Racing offshore or heading somewhere remote?
For a race programme, a Sydney to Hobart or a bluewater expedition, our sister loft Kraken Sails designs laminates, membrane sails and storm wardrobes for the hard end of sailing.