The following is a reprint from "The Multihull Company" Newsletter. It was authored by the company's founder Phillip Berman, who has won several international catamaran regattas, and has authored many books on catamaran sailing and racing.  Mr. Berman has graciously allowed us to reprint the article here.

Daggerboard Pros and Cons

PROS

1. A daggerboarded cat will sail consistently higher into the wind than a
cat with keels.  Typically between 5 to 7 degrees higher. This added speed and pointing ability represents a significant safety feature when cruising because it enables you to claw off a lee shore or to arrive at an upwind destination with far greater alacrity. Sometimes you cannot "run for cover" - you must "beat for cover."

2. A daggerboarded cat, all things being equal, will sail at least 2 knots faster, on average, than a catamaran with keels simply because it isn't carrying the enormous fixed hydrodynamic drag (i.e. wetted surface) of two long and deep fixed keels. This added speed is a significant safety feature for long-range cruising. Not only are long passages cut shorter, reducing exposure to adverse weather, but should one encounter adverse weather it is much easier to either run from it or avoid it entirely with proper weather routing. A faster boat always increases one's options, and therefore increases safety, when cruising.

3. A daggerboarded cat typically draws 2 to 2.5 feet less water than a cat
with keels. As such, the sailing grounds and potential anchorages available to a cat with daggerboards are considerably larger than those available to a keel cat.

4. In extremely severe seas, daggerboards enable the skipper to adjust the balance of his catamaran by raising and lowering the boards. When sailing in large cross-seas you typically raise the leeward daggerboard entirely and lower the windward board half-way to prevent being tripped over by a breaking wave. A keel cat is stuck with the keels down, all the time - as such, there is no way to prevent the boat from "tripping over herself" in storm-force conditions.

CONS

1. Daggerboards are very costly to construct. A builder must create dual
daggerboards as well as dual daggerboard trunks, along with the winches and pulleys to raise and lower them. Dual daggerboards add about $30,000 to the construction cost of a 45 foot catamaran.

2. Daggerboarded cats are not a good idea for bare-boat chartering because bare-boat sailors run aground a lot. Even if they are told to raise the daggerboards when they are not beating, they forget-which results in broken daggerboards. Charter sailors do not care about performance, so there is no sense offering them a costly option they will very likely break.

3. Daggerboards that are not carefully installed by a professional shipyard can rattle in their trunks. This is annoying. A well built cat will not have this problem.

4. If you are not a careful navigator and operate near shallow waters with your daggerboard (s) in the down position and plow into a hard reef at high speed, you will do serious damage to your daggerboard and possibly also to the bottom of your boat. While most daggerboarded cats have mini-skegs to protect the rudders and saildrives from a grounding, a high speed collision with a reef could do major damage to the bottom of your catamaran.

5. Daggerboard trunks take away a modest amount of interior room from the inside of each hull.