1) How long should a backside rib repair be? I have a Thompson take-a-long wood canvas er-uh-rowboat. Planks are over 3" wide and two planks worth seem like enough. The ribs are 3/8" thick and 1 1/2" wide. So I planed some ash to 3/16" and figure I'll back-up those cracked ribs after taking material from the backside of the cracked rib. 2) And, does it matter if the repair is tapered or not in thickness? Or should the joint be 45 degrees or more accross the rib or an arrowhead shape? Don't know if the stiffer patch might make undue stress at the joint end if it is at 90 degrees to the rib. I shoulda' paid more attention to the prior posts about backside repair, but I couldn't afford to pay attention at the time. 3) Or--is ash too stiff/strong? Should I just use cedar? thanks, Dave frozen in Lapeer.