> What's the back scale length of A-0? > 95mm Not an awful lot. Is that all the room there was? > Bass rescaled? > Only slightly - reduced spl to get slightly longer tail lengths. What was the original A-0 back scale? > What's the core diameter of A-0? > .058 Still fairly stout. I'd say it's likely a combination the board being too stiff, with the back length, and core diameter contributing. Up to about 6-1/2' (200cm) I float the tail around the low bass too. The bridge is for sure clearing the edge of the plate, right? I recently had an embarrassing reminder of how easily that can happen. > What "design" board did you build? > Radius cut ribs - 60 ft in the bass and tapering to the treble - 16 > total. Made from quartered Sitka. Glue up at around 6 to 6.5 mc. What method did you use to determine the count and dimensioning of the ribs? > The board was not cut off in the bass but the inner rim gluing surface > was built up with epoxy and veneer to accomidate the part of the board > that did not want to go down on the rim without a struggle. Why not, and why? > Thickness is 9mm - on the fat side - no diaphraming. Again, why? Ron N
This PTG archive page provided courtesy of Moy Piano Service, LLC