Like I mentioned in my first post about lumber, qualities such as straight, contained grain in the region that will become the shaft (at least 36 inches is a good guideline) is a must, with the grain in the blade region of less importance for strength. At the mill I get the shop guys to machine plane the board down to 1 1/8th inches which will be the final thickness of the shaft. Warren's book mentions 1 1/8th as fine for round hardwood shafts and 1 1/4 inches for soft woods.
Here are some basic steps in prepping the blank.
1. First, mark the centre line of the board (I've started using a chalk line for convenience but any method is fine)
2. Then, trace the pattern of your chosen paddle on the board ensuring the centreline for paddle matches to that of the lumber stock. For the shaft of the paddle, I use a 40 inch metal straight edge that is exactly 1 1/8th inches wide and trace the edges to the grip
3. Keeping in mind that sawing out can cause up to 1/8th inch of lost wood, keep to the outside of the line when sawing. Excess wood can be later shaved off to meet the desired dimensions, but once you cut too thin (especially around the shaft), the wood paddle will lose much of its strength.
4. Using a simple handsaw (I prefer a fine toothed one with 12-15 teeth per inch which minimizes spliting and leaves a cleaner edge), cut around the pattern and if the blade shape permits, continue in one long continous curvy cut around one side.
Here are some pics of the progress:
Beginning to saw out the pattern. I'm using a walnut scrap piece to lightly wedge the cut open as I saw, making cutting curves easier without the saw sticking due to friction.
Cutting around the second side. The 1st side cut pretty cleaner and the "waste" wood will be re-used (last photo)
Final Blank cut out and "dressed" with guidelines (more on that in another post)