Sipu Muin is a Type 400 BHC AP1-88/400 air cushion vehicle (ACV) or hovercraft, the first of two vessels constructed for the Canadian Coast Guard.

[2][3] The ACV is powered by four Caterpillar 3416 TTA diesel engines turning two controllable-pitch propellers creating 2,818 kilowatts (3,779 hp).

[3][b] The contract to build Sipu Muin and sister ship Siyay was awarded in May 1996 to GKN Westland.

The two hovercraft were built by Hike Metals & Shipbuilding Limited at their yard in Wheatley, Ontario.

[2] At the time of construction, Sipu Muin and Siyay were the largest diesel-powered hovercraft in the world.