Here's a fun one, the first 10-string Concerto model I've made. The general goal is to add a C course to a mandolin while retaining overall feel and playability of a mandolin. The scale length ranges from 13.75"/35cm on the treble side to 15"/38cm on the bass side. Even though it shares 97% of the DNA with one of my normal mandolins, there were still plenty of challenges, and getting the fretboard worked out and every note playing in tune was many hours of fun.
But it's finally done and it is quite a pleasure to play. It fits in a normal mandolin case and I tried to keep it as "normal looking" as possible.
Nautilus 10-string Concerto #38
Custom 13.75” to 15” multi-scale, tuned CGDAE
Sitka spruce top, custom Concerto voicing intended for Thomastik Mittel strings
Parallel tone bar bracing
Nouveau f-holes with smoked etimoe purfling inlay around sound holes
1.95" side depth (deeper than usual body, but not so deep as to lose the clarity of trebles)
Highly figured bookmatched walnut back w/ sapwood
5-piece walnut and curly maple neck w/ extra carbon fiber reinforcement
Compound radius black ebony fretboard w/ walnut and maple angled fret markers on top and side of fretboard
Highly figured walnut headstock w/ thin line Jacobson script inlay
1.32″ (1.39” on the hypotenuse) nut width, standard compound radius
C shaped neck, custom shallow profle
.080″ x .040″ frets ("Banjo frets")
Thin satin marine varnish finish
There is no plastic binding -- the walnut sides, maple and fumed etimoe (black stripes) sides act as binding, and the fretboard feels just like a bound neck (undercut fret tangs, and the fret slots do not extend to the edge)
Jacobson wenge bridge, special compensated and angled ebony saddle
Jacobson engraved and selectively darkened brass tailpiece with black ebony frame
Custom 10-string Rubner tuning machines with gloss brass finish and rosewood buttons, teflon bearings
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