Please select your home edition
Edition
upffront 2018 Millionaires Tape 728x90

Furling Drum Locks - to lock, or not to lock?

by Kerri Robson 3 May 09:00 BST
Furling Drum Locks © Facnor

There is somewhat of a debate over the use of drum locks on a continuous line furling drum. As it says on the tin, a drum lock is designed to lock a continuous line furling drum in place, in order to prevent accidental unfurling which can be inconvenient and potentially dangerous.

There are plenty of conventional options available to keep your sail furled when it is not in use, or during hoisting and dropping:

Velcro

Commonly used for code zeros on boats up to 40 - 45ft, the code zero has a Velcro clew pad which sticks to itself when the sail is fully furled - in the right direction! However, this is not ideal as the sail must always be furled accurately and the Velcro isn't always reliable.

Rope Bight

Depending on the drum manufacturer, another neat way to lock the furler is to pass a bight (bend) of furling line rope through one of the lightening holes in the drum.

This is obviously only possible where there is a gap in the body of the furler, plus it requires there to be slack in your furling line - as well as a trip up to the foredeck!

Furling Line Jammer

To hold a continuous furling line securely in place, it is possible to cleat it on both sides of the loop. Selden have a good double block/cleat specifically designed for this purpose, and it provides a nice safe system when the sail is not in use.

Horn Cleat

Probably the simplest and safest way to secure a continuous furling line to prevent the sail unfurling is to take the end of the loop and hitch it around a horn cleat.

However, all the above are solutions for securing a fully furled code zero or asymmetric. The role of a drum lock is quite different - it is designed as a temporary safety mechanism to prevent an accidental unfurl during a manoeuvre.

Imagine the scenario: you are half way through furling in the code zero and you spot your favourite, double grip, winch handle on the opposite side deck, just about to plop overboard. What do you do? Drop the furling line and let the sail unfurl, risking expensive sail damage... or save the sail and lose the handle!?

This is where the automatic drum lock comes into its own, allowing you to save both the sail and the handle! You can literally 'drop' the furling line and the lock will automatically engage, holding the drum whilst you grab the handle. Then you can come back to the furling line and quickly resume the furl.

When using a furling drum lock, it is important to remember that they are only intended as a very short-term safety device, not a secure way of holding the drum for long periods. They should also never be used as a reefing system the lock mechanisms are not designed to take this type of load.

It sounds like a sensible feature why wouldn't I have one?

The downside of the drum lock is that they add a layer of complexity to an otherwise very simple system. Some drum locks only work in one direction which means you always have to be conscious of the direction of furl. Plus there is the additional reliability risk and the possibility that a faulty drum lock actually prevents you from completing a furl.

Ultimately, for cruising and shorthand sailing, upffront.com would definitely recommend a drum lock as a valuable temporary safety mechanism, and a great addition to your furling system for increased peace of mind.

However, for racers and fully crewed boats we would suggest a drum lock is not needed in fact, a lot of racers remove it, as the potential downsides outweigh the benefits.

Considering adding a drum lock to your continuous line furling drum? Browse our range of continuous line furlers here or get in touch with us using our 'Furling Enquiry' form.

Related Articles

New in Genoa Sail Furling
Facnor LS/LX/RX available at upffront.com We've said it before, and we'll say it again: here at Upffront we are passionate about lighter, faster and safer sailing. As a result, we are constantly searching for performance orientated solutions that will optimise sailing for all. Posted today at 8:00 am
nke Marine Electronics - Do I really need Wi-Fi?
Have your phone or tablet display wind, speed, and more More sailors are jumping on board with performance enhancing marine electronics than ever before, and we've had an influx of enquiries since adding nke Marine Electronics to upffront.com. Posted on 20 May
Measuring a Torsional Cable: Luff Length Troubles
Code Zero head and tack patches versus optimum luff length Previously on the upffront.com blog, we looked at how to measure a new torsional cable for your boat, and emphasised the importance of an accurate measurement to ensure a correct cable specification for your new code zero or downwind asymmetric. Posted on 15 May
Measuring Your Boat for a New Torsional Cable
Process for getting an accurate result You have decided to go for a new code zero or downwind asymmetric. To ensure the furling system fits your boat, it is important to take a physical measurement of the maximum space available from the drum to the full hoist position. Posted on 10 May
Explore the Spinlock Rope Clutch Range
Some of the best high-performance clutches on the market: XAS, XTS, XCS Exploring the Spinlock range, the XAS rope clutch is a multi-role clutch with excellent performance across a wide rope range. It comes in two sizes: 4mm – 8mm, which has a maximum load of 400KG, and 6mm – 12mm, which has a maximum load of 575KG. Posted on 26 Apr
Reducing Weight Aloft with Composite Backstays
Simple replacement offerring superior performance over wire Reducing weight aloft is one of the most cost effective ways of increasing your boat speed and performance: every kilogram you take out of the rig is roughly equivalent to 4kg added to the bottom of your keel. Posted on 22 Apr
PROtect Tapes take on regatta plastic pollution
Biodegradable and compostable hull stickers available Experts at creating products designed to tackle chafing, abrasion, scratches, damages, ageing, and wear, PROtect Tapes have now honed their unique technical film know-how to create biodegradable and compostable bow and hull stickers Posted on 17 Apr
Fresh In - Tiller Extensions
From three big players: Spinlock, Harken and Ronstan We are excited to now introduce six ranges of tiller extensions on upffront.com, from three big players: Spinlock, Harken and Ronstan. Posted on 15 Apr
Dyneema Braided Cover
The latest addition to your tool kit Dyneema® is the strongest fibre in the world. Ten times stronger than steel, and seven to ten times lighter than a steel wire of equivalent size, Dyneema® is one of the most durable and sought-after materials on the sailing market. Posted on 8 Apr