axe, really sharp drawknife, farriers rasp, knife/scraper
i like to hack the basic shape- including a little width taper- with the axe (usually when i harvest the stave so it'll dry faster- there might be some tying down to reduce twist, too), then clean it up with a drawknife. i try to do alot of the thickness taper with the drawknife, too, but usually end up doing most of that with the farriers rasp- kinda depends on how many knots there are. the rasp does a great job when there aren't too many undulations. if there are, i spend alot more time scraping. i check the flow of the taper with my fingers every time i remove any wood. once it starts to feel like a bow, i start floor tillering. on sapling bows, i find that i don't need to worry about the width taper much at all. by the time the floor tiller is close the tips are usually fairly equal. my usual pattern goes like this:
hack, scrape, drawknife, scrape, rasp, scrape- i pretty much scrape after everything to clean it up for a more accurate feel. i don't usually sand it until i after i'm done with the long string.
i like this thread- very educational!
Rob