The Nealon Equation

y  =  (A*sin(B*x+C) + D*sin(E*x+F) + G*sin(H*x+I) + J*sin(K*x+L)) *

 (M + N*x + O*x^2 + P*x^3 + Q*x^4) * atan(R*x) * atan(S*(BL-x))

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Martin 1932 Arch Top

 

(A*sin(B*x+C) + D*sin(E*x+F) + G*sin(H*x+I) + J*sin(K*x+L) ) *

(M + N*x + O*x^2 + P*x^3 + Q*x^4) * atan(R*x) * atan(S*(19.30-x))

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Martin Arch Top

19 Coefficients

    A = 8.823088535962782E+01

    B = -1.231620304444220E+00

    C = 8.742519521928438E+00

    D = -4.167125668379466E+00

    E = 6.430156899029385E-01

    F = -3.553494879077299E+00

    G = 2.100064937643690E+01

    H = -1.429827292915055E-01

    I = 2.968393795991227E+00

    J = -8.841472998333727E+01

    K = 1.232658281596102E+00

    L = 6.950941129611863E+00

    M = 4.409956898126648E-01

    N = -1.803040796745401E-01

    O = 3.527663218669812E-02

    P = -2.839821536882589E-03

    Q = 8.110185597023235E-05

    R = 5.316821483632432E+01

    S = 9.129924866004970E+00

BL = 19.30

8.823088535962782E+01

-1.231620304444220E+00

8.742519521928438E+00

-4.167125668379466E+00

6.430156899029385E-01

-3.553494879077299E+00

2.100064937643690E+01

-1.429827292915055E-01

2.968393795991227E+00

-8.841472998333727E+01

1.232658281596102E+00

6.950941129611863E+00

4.409956898126648E-01

-1.803040796745401E-01

3.527663218669812E-02

-2.839821536882589E-03

8.110185597023235E-05

5.316821483632432E+01

9.129924866004970E+00

 

1932 Martin C-3 Arch Top Guitar

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Martin Arch Top 1932