scorp. AT least that's what woodworkers use to hollow out the seat of a chair. It has a round blade set at 90 degrees to the handle, with the sharp edge toward you, and you pull it to gouge out the wood. They use small ones to gouge wooden spoons.

Here's a picture of a micro scorp, in which the cutting blade is not set perpendicular to the handle. The larger ones would have a 90 degree bend just above the business end. The larger ones might be as much as four or five inches in diameter, and the blade could even be oval rather than round.

http://www.leevalley.com/wood/page.asp?SID=&ccurrency=2&page=31087&category=1,130,43332,44073

Edit:

I'm assuming that the ones you used for boat building were marine scorps.

TEd