What Is The Difference Between a Genoa and Jib? (With Pictures and Tables!)


I have been in the sailing community for over 10 years, but I come across new words for the same thing almost every day. Left on a boat is called port, and a rope is a sheet, etc., you know how it goes. When it comes to sails, it is the same; there are many complicated names that often are used interchangeably.

Such is the case with the jib and the genoa, but that ends today! This article is all about explaining the differences between two types of foresails (or headsails).

A jib is a foresail that does not extend aft beyond the mast; a genoa, on the other hand, is larger and will overlap the mast and part of the mainsail. A jib sail is used for strong winds and is easy to handle, while the genoa is perfect for downwind sailing in light winds.

So now that we understand the basics, what does this actually mean if we intend to become great sailors?

JibGenoa
SizeSmaller than foresail triangleLarge than foresail triangle
WeightLightHeavy
Ease of handlingEasyCan be tricky underway
Stowing awayEasyCan be tricky underway
Main useStrong winds (storm jib)Light winds

Main Differences

Size

When comparing these two sails, the most obvious factor is the size, a jib; as mentioned before, that is so big that its clew overlaps the mast, is called a genoa. This difference in size results in different sail characteristics, which we will discuss more below.

Looking at the boat from its side, sometimes the genoa is so big you can barely see the mainsail, but on a jib the sail will always fit inside the forestay triangle.

Jibs and genoas are classified by percentages of how much they fill the foresail triangle (the area between forestay, deck, and mast). A jib is only a jib if it stays within the 100% mark (filling, but not exceeding, the foresail triangle space). Anything above that number, 130 %, etc., would be considered a genoa.

The boat-world is full of ambiguity and, of course, so also regarding names of sails; even though this is the most common way to classify sails, some would argue that jibs are up to 130%. And some will use the word jib and genoa interchangeably, but as long as you see the foresail triangle and how much space the headsail occupies, you now know what type of sail it is.

Weight

Jibs and genoas can be made in the same materials, so the increased weight from a genoa is mainly due to increased sail area and extra reinforcements. The jib is usually easier to mount because of its low weight and since it is a smaller package to handle.

Ease of Handling

Handling a jib under sail is somewhat more manageable than the larger genoa since the jib does not extend beyond the mast. It cannot get stuck or entangled in a spreader or side stay (which a genoa often does). Tacking is, therefore, much more straightforward and smoother and perfect for beginners.

If you are using a hank-on system, changing to the larger genoa will also be tougher to hoist, which can be mitigated using electric winches.

Potential Longevity

As we discussed above, the smaller jib has fewer contact points with other parts of the boat. Fewer points of contact mean less chafing and potentially longer life; this life expectancy can, of course, be dramatically reduced if we are talking about a storm jib that will only be used in really rough weather.

Stowing Away and Attaching The Headsail

Lower weight and smaller size make stowing easier to handle. Not only will it pack away much more conveniently, but getting the sail from its stowaway position to its “ready to hoist” position is straightforward compared to a huge “I’m walking with arms full.”

When to use a genoa

You should use your genoa when winds are low, and you are not getting enough speed out of your jib and mainsail setup, then it is time to change for the larger and more powerful genoa. The genoa will direct more wind over the mainsail, increasing lift and greater force than with the jib that will spill some wind.

How to sail downwind on a catamaran!

If the wind is picking up and the boat is starting to get overpowered. On a monohull, this is when heeling angle increases, but the speed of the boat doesnt; a catamaran is different since it doesnt heel, and you will have to keep an eye on the wind speed table to make sure you dont risk breaking the mast or capsizing.

The smaller jib stays inside the foretriangle

When To Use a Jib

The jib’s primary use comes from creating an airfoil and feeding the mainsail with smooth flowing air. This means less turbulence and higher efficiency over the mainsail, even though the jib has a small sail area.

Smaller headsails such as the jib are also used for long-distance passage-making, where the risk of enduring storms days on end is real. For ocean cruising like this, most boats employ a multi headsail setup where at least one should be a small jib.

There is also a place for the storm jib, something made explicitly for really high winds; these types of staysails can come into two types; either they are of the hank on style, which means you will have to hank off the other headsail before you mount your storm sail.

Or it is of the type that you put over the already furled headsail. Many times the storm jib has a very bright orange color and offers extra strength materials and sowing. The storm jib is even smaller than your already small jib.

Main Similarities

As we have seen above, there are some differences between the two, mainly in size and therefore also when to use them. But these things aside, there are actually more things in common than that separates.

Both are off-course headsails or staysails (want to understand catamaran parts? read this) and provide balance and power to the cat.

Often, a headsail can be enough to propel the boat at a pleasant and comfortable speed, but what you will notice is that the ship will have a different feel if sailing without the mainsail. The headsail is also very easy to sail single-handedly; the roller furling makes adding or retracting sail area very straightforward while still letting the crew rest.

On the other hand, the mainsail usually requires one or more people to get on top of the deck to pack it up and safely store it.

Hank on system

Raising, Reefing, and Furling a Headsail.

The genoa and the jib can be mounted on a furling system that rolls the canvas up onto the forestay when it is not in use. This is the most common setup since it is fast, easy, and very safe to increase and decrease the sail area from the cockpit using three lines.

Both sails can also use the hank on system (picture above), which is slower and requires more effort by the crew but minimizes airflow disturbances that a semi-rolled up furling will induce.

Summary

If you remember anything from this article, I would say this should be the thing; a jib is smaller and does not overlap the mast or mainsail; the genoa is larger and extends past the mast. The Jib is perfect for rough weather and is easier to use, stow, and attach. The Genoa is heavier, better for light wind conditions, and optimized for downwind performance!

Gabo

Owner of CatamaranFreedom.com. A minimalist that has lived in a caravan in Sweden, 35ft Monohull in the Bahamas, and right now in his self-built Van. He just started the next adventure, to circumnavigate the world on a Catamaran!

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