Account Navigation

Account Navigation

Currency - All prices are in AUD

Currency - All prices are in AUD
 Loading... Please wait...
Precision Sails Ltd

Precision Sails Blog

How To Measure For A New Spinnaker

Posted by Matt and Jessica - MJ Sailing on


Matt and Jessica from  MJ Sailing are going to dive into the Precision Sails Spinnaker Measurement form and show you how easy it is to measure for a new spinnaker by taking measurements for their boat, Elements of Life, a 1983 Trisalu.

"...we have done both our mainsail and headsail through precision and although those forms are very simple it did require some measurements. But for the spinnaker, it's only a few measurements that need to be taken. So it is a very simple process..."

Section 1. Halyard Location

Halyard Location Diagram

These measurements help the designers to determine the size of your spinnaker and properly monitor its shape during design.

Location of Spinnaker Halyard

Does your halyard come out of the top of the mast (Masthead) or slightly above the forestay (Fractional)?

"...basically does it come out of the top of the mast? or do you have a fractional rig and it comes out a bit lower..."

Measure Your Max Hoist

Spinnaker Max Hoist Measurement

Attach a tape measure to your Spinnaker Halyard and hoist until it stops. Measure to the deck/bowsprit that your track will run to.

Quick Tip: Tie a retrieval line to your halyard so that you can recover your halyard if the tape snaps!

Section 2. Sheeting The Sail

Spinnaker Sheeting Block Position

These measurements are used by your designer to properly sheet the sail and monitor the shape of the spinnaker in our design software.

Block Position For Clew

Spinnaker Block Location

Is your sheeting block adjustable or fixed? Select the appropriate box on the form.

"...on Element's we have a perforated toe-rail, so we can adjust the position and the best location for our winch..."


If you have a bowsprit measure from your fore-stay attachment point on the deck to the sheeting block location you intend to use for your spinnaker sheets.

If you do not have a bowsprit but are going to be attaching your block to your anchor roller than mark the location of the block you are going to install and measure from that point to the sheeting position along your toe-rail.

sheeting position spinnaker

Section 3. Spinnaker Sock

A spinnaker sock is a great tool for helping to manage the unruly spinnaker. By constructing a sock based on your design you will get the perfect length and the 'toilet-bowl' will allow for you to release and douse your spinnaker single-handed with ease.

Learn more about spinnaker socks.

Section 4. Spinnaker Furler

spinnaker fuler and pole measurements

Spinnaker Furlers are a great tool for the short-handed sailor as it simplifies the function of raising and dousing the spinnaker to a function that can be carried out at the cockpit.

If you will currently or in the future will be using a spinnaker furler please provide us with the Furler Model.

Section 5. Spinnaker Pole

A Spinnaker pole is used to help support and control a symmetrical spinnaker. However, they can be used on an asymmetrical as well.

" the spinnaker we're looking for is a cruising chute, an asymmetrical spinnaker. Which does not typically use a pole so we are not going to be using a pole for that..."

If you will be using a spinnaker pole select the appropriate box on the form and provide your pole length.

Section 6. Spinnaker Color(s)

spinnaker colors, mj sailing

A variety of available spinnaker colors and panel configuration makes designing your spinnaker fun and unique. Spinnakers can be designed as single or multi colored.

spinnaker colors mj sailing

Standard Spinnaker colors such as black, natural, dark blue, red, and green are readily available for your design.

Custom Colors such as orange, coast gold, yellow, light blue, ocean blue, navy, purple, and grey are available as well but need to be ordered in.

Notes And Photos

Don't forget to write notes and attach photos of your boat to your form. Knowing what makes your boat unique or being able to see your specific rig helps the designers to optimize the design of your spinnaker.

Harvest Moon Regatta Victory

Paul Britton S.V. Rodeless Traveler Jeanneau 379 Sun Odyssey The Harvest Moon Regatta Around 150 boats took part in the Regatta this year but one in particular stuck out and performed exceptionally, bringing home some new trophies for the trophy case! S.V. Rodeless Traveler had a wild ride with varying winds, and a blown mainsail but ultimately they took [...]

Read More »

Sail Graphics, Colored Dacron and Color Customizations

Sail Graphics and customization One of the most exciting parts of ordering a sail is the customization. It is your opportunity to emblazon your team logo, a symbol that represents your family, a play on your boat’s name, your boat’s insignia, or to match your Dodger or Bimini to your sail.Sail Color CustomizationColored Dacron The oldest form [...]

Read More »

Pender Island Beach Cleanup

This past weekend the Precision Sails team headed over to Pender Island, a portion of the Southern Gulf Islands, for some training, and relaxation. This 34km2 island is a beautiful spot nestled in between Mayne Island and Saturna Island on the Westcoast and offers up lots of opportunities for sailing, kayaking, and hiking. Sadly, many of [...]

Read More »

Spinnakers: Rigging, Trimming, Gybing

Introduction A spinnaker is downwind sail set at the bow which billows when it catches the wind. Lightweight and custom made for the wind range you plan to sail in. All of our spinnakers are radial designed and stitched together expertly to prolong their life.Symmetrical A symmetrical spinnaker, as it sounds, is balanced and proportional. Both sides [...]

Read More »

Jibs vs Genoas

Jib Vs Genoa Jibs and Genoas are triangular sails which are affixed to a stay in front of the mast. Typically they run from the head of the foremast to the bowsprit. Jibs and genoa's are used in tandem with a mainsail to stabilize the vessel and are usually measured by their Luff Perpendicular percentage, that is, how [...]

Read More »

Sailing 2000 Nautical Miles in the Sea of Cortez and the Bahamas

Francois Hebert S.V. Trioomph Corsair F27 R Trimaran Francois Hebert works as the General Manager and head coach at the Whistler Sailing School. He recently went through the process of ordering sails from Precision Sails for his Corsair F27 R trimaran, "Trioomph". Trioomph's mainsail and furling jib were made using Warp Drive sailcloth from our Precision Tri-Radial Series. The [...]

Read More »

Reefing 101: How to reef a mainsail and when to do it

Reefing 101 Reefing is meant to increase your ease-of-use, flatten sail shape, reduce sail area, and re-position the boat's center of effort. This reduces heeling and de-powers your sails to improve safety and stability in rough weather. Reefing is an important part of sailing to learn and understand how to do efficiently and effectively. This guide is meant [...]

Read More »

Racing my J40 with Precision Sails

Owen Harren S. V. Event Horizon 1986 J40 S.V. Event Horizon When we purchased our J 40 she came with several Dacron sails in “good” condition. After a few months of racing it was apparent we had exceeded both their performance and life expectancy. My wife and I contacted several local, commonly known sailmakers who were unresponsive or very “non-customer service focused”. [...]

Read More »

Leech and Foot Lines

A leech line is attached at the head of your sail and runs down to just above the clew. This line can be usually be adjusted using cleats, or Velcro tabs at the clew or intermediately at reefs. Tensioning this line reduces flutter in the trailing edge of the sail and improves sail shape. Foot lines run along [...]

Read More »