After an hour's work cutting the bevel into the top of the garboard plank on the port side with my no. 4 and not really getting anywhere, I bought a new cheaters tool, a nice Makita power planer. Where I call my Stanley no. 7 Mr Smooth, this thing is called the brute squad. It removes material at a somewhat disconcerting rate.
An aside: I'm not impressed with these Record Irwin chisels. They were the best I could find locally, but they're really soft and don't hold an edge for long. At least they sharpen easily. My suspicions about soft edges were confirmed when I dropped this one on the concrete floor, and the tip actually bent over rather than snapping. Also, the rubber bits on the handles are falling apart before my very eyes. I've got my eye on some nice Veritas ones. If they're anything like my spokeshave they'll hold an edge forever (and be a real PITA to sharpen).