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Choosing the right Flexible Furler for your boat

CDI Flexible furler FF2 model

When trying to select the right CDI Flexible Furler for your boat, there are a few things to check on to make sure you order the correct one!
In this guide we will walk through all the steps to measure your boat and order with confidence!

The first thing we need to do is take some measurements from your boat.

Measuring the pin to pin length of your forestay

If your forestay is disconnected from the boat:
1) Lay the forestay out flat
2) Measure from the mast pin at the top of the forstay all the way down to the T-Bolt at the bottom of the turnbuckle*
3) Check your manual to make any deductions required for installation

*If you need to undo the turnbuckle to take the forestay off the rig we highly recommend marking the correct turnbuckle position with a sharpie for easy reinstallation.

If your forestay is connected to the boat:

1) Attach the end of your tape measure to your headsail halyard

2) Hoist the tape all the way up, until it stops on it’s own

3) Take the measurement from your tape. This will get us close to the correct forestay measurement
4) Now we must step back with the tape still hoisted, and look at the distance from the top of the tape, to the forestay pin. Take your best estimate, and add that measurement to the measurement we got from the hoisted tape measure. This is our forestay length.
5) Check your manual to make any deductions required for the installation of your furler.

Measuring the diameter of your forestay wire

To measure your forestay wire all you need to do is line calipers up with the thickest point of the wire on each side, and record the measurement from your caliper.

Measuring the diameter of the turnbuckle pin

To measure the diameter of your turnbuckle pin, simply use your calipers at the thickest part of the thread.


You can also watch our video down below where Darryl reviews the process of measuring your boat.

Once you have those measurements, compare them to the table below and it will show you which furler will best fit your boat.

Furler Sizing Table

Flexible Furler Model

FF1

FF2

FF4

FF6

FF7

FF9

Max Headstay Length

21′

29′

33′

39′

47′

53′

Max Headstay Wire

1/8″

3/16″

1/4″

1/4″

1/4″

5/16″

Max Turnbuckle Pin

1/4″

5/16″

7/16″

7/16″

1/2″

1/2″

Luff Tape

#6

#6

#6

#6

#6

#6