I INTEND TO REPRODUCE THE WONDERFULL SHAPE OF MY HYDRO HULL BUT WOULD LIKE TO KNOW WHAT’S THE BEST TOOL TO MAKE CONCAVE … BY HANDS OF COURSE… THANKS FOR ANY HINTS B.
Brian, A good tool for concaves is a balsa block that’s exactly 1/2 the size of a standard sheet of sandpaper. That way you can make more than one with different radius curves, two bjocks for one sheet. You can hand-shape the curve into the block, or make a jig for your router to cut it. I made the jig so that I could produce as many curved blocks as I want, but that’s a lot of work for just one. After the curve is cut, stick the paper with the spray glue that’s used for sanding discs. You can use other kinds of wood as well, but the balsa has a nice light feel to it. Doug
small sureform and sanding block flexible (plexi-glass) material w/ glued on abrasive
big nap roller feom the paint store was popular 'round here at one time…big concaves?1/4-1/2" i blast’em with the planer on edge an then stroke em lengthwise then crosswise at an angle …45 deg an then tacross da udder way with the clark razor plane…solingen?.. then use the the two inch foam with sand paper back to back glued sandpaper and repeat the length and 45’s pattern walk it out through the grits…concaves with maka pia pia …ambrose… just woke-up ( under 1/8" just ignore this pattern and use a block) weinie concaves though under committed are a step in the right direction