Bow-Beam. The bow-beam runs across the bows of a catamaran, at the deck level and is attached to the inside of each hull on mounting plates. In the photo you can see Bit-by-Bit’s beam where it attaches to the port hull.
Beam attachment to hull
The beam is most often aluminum or a composite of fibreglass, kevlar and carbonfibre, and serves several purposes:
1) Provides structural integrity to the bows of the hulls, keeping them a fixed distance apart at all times.
2) Houses the divided-forestay, which in turn supports the forestay.
3) The anchor rode usually run forwards from the chain-locker to a roller on the bow-beam, allowing the anchor to move vertically down and up from this point.
4) Downwind sails, such as a symmetrical spinnaker, screecher or gennaker, can be flown from a bowsprit attached to the bow beam.

The first photograph below shows the triangular divided forestay sticking upwards from the beam, and the forestay (with the blue genoa sail-cover wrapped around it), with the furling gear attached at its base. The second shows a close-up of the center of the beam. The anchor hangs from beneath the beam on the main roller, the white roller above that is for the secondary anchor. Above the beam is the attachment point for the forestay and above that is the roller-furler (the Profurl’s yellow drum). Beneath the anchor and aft is the nacelle just above the water, and the escape hatches on either side are for use if the boat capsizes and the coach is under water. They are also portholes into the port forward cabin and starboard head.

BB at Wappinger Creek (Bows) Bow-beam

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