Student Harp Kit by Josephus Harp Shop

© Joseph Jourdain – Josephus Harp Shop – 2019

 

These Harp Student Kits were made for Marilyn's Students rental. I don't make them anymore but you are free to used the information provided here and make your own.

The joints on the neck, pillar and sound box were dry joints using bolts for easy repair if needed.  Nothing pretty there but they are earth quake proof !! Aviation plywood for sound board and back, straight box, solid western  maple for neck and pillar, sides with solid fir.  After you made the patterns and worked out your production layouts you can make a harp in a couple of days. You can download the CAD DXF file HERE. String data below. Demo video HERE.

 

 

String data: 

    SUMMARY REPORT  -  DATE : 06-11-2019     FILE : 36STNEW2
    -------------------------------------------------------------------------------------
    Instrument : Student harp 36 strings    Number of Strings : 36 
    Unit used : British Unit        
    Owner : C7 to C2              2007 production
   

    | ST# | NOTE |    FREQ    |   LENG   | CMAT | WMAT |  CDIA |  WDIA |  BDIA |  ODIA |    TENS |   BRPT  |  TEN% |  T/L  |  IMPD |
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1 C7 2093.000 3.750 Nyl 0.025 0.000 0.000 0.025 12.076 21.893 55.161 3.220 0.135
2 B6 1975.500 4.151 Nyl 0.025 0.000 0.000 0.025 13.182 21.893 60.213 3.176 0.141
3 A6 1760.000 4.592 Nyl 0.025 0.000 0.000 0.025 12.805 21.893 58.487 2.788 0.139
4 G6 1568.000 5.078 Nyl 0.025 0.000 0.000 0.025 12.428 21.893 56.769 2.448 0.137
5 F6 1396.900 5.610 Nyl 0.028 0.000 0.000 0.028 15.102 27.463 54.991 2.692 0.169
6 E6 1318.500 6.191 Nyl 0.028 0.000 0.000 0.028 16.385 27.463 59.664 2.647 0.176
7 D6 1174.700 6.821 Nyl 0.028 0.000 0.000 0.028 15.788 27.463 57.489 2.315 0.173
8 C6 1046.500 7.500 Nyl 0.032 0.000 0.000 0.032 19.786 35.869 55.161 2.638 0.221
9 B5 987.770 8.228 Nyl 0.032 0.000 0.000 0.032 21.216 35.869 59.147 2.578 0.229
10 A5 880.000 9.002 Nyl 0.032 0.000 0.000 0.032 20.156 35.869 56.192 2.239 0.223
11 G5 783.990 9.822 Nyl 0.032 0.000 0.000 0.032 19.045 35.869 53.095 1.939 0.217
12 F5 698.460 10.684 Nyl 0.036 0.000 0.000 0.036 22.637 45.397 49.864 2.119 0.266
13 E5 659.260 11.587 Nyl 0.036 0.000 0.000 0.036 23.720 45.397 52.250 2.047 0.272
14 D5 587.330 12.527 Nyl 0.036 0.000 0.000 0.036 22.005 45.397 48.472 1.757 0.262
15 C5 523.250 13.500 Nyl 0.040 0.000 0.000 0.040 25.042 56.046 44.681 1.855 0.310
16 B4 493.880 14.504 Nyl 0.040 0.000 0.000 0.040 25.751 56.046 45.946 1.775 0.315
17 A4 440.000 15.535 Nyl 0.045 0.000 0.000 0.045 29.676 70.933 41.837 1.910 0.380
18 G4 392.000 16.591 Nyl 0.045 0.000 0.000 0.045 26.866 70.933 37.875 1.619 0.362
19 F4 349.230 17.668 Nyl 0.050 0.000 0.000 0.050 29.854 87.572 34.090 1.690 0.424
20 E4 329.630 18.763 Nyl 0.050 0.000 0.000 0.050 29.996 87.572 34.252 1.599 0.425
21 D4 293.660 19.874 Nyl 0.055 0.000 0.000 0.055 32.318 105.962 30.500 1.626 0.485
22 C4 261.630 21.000 Nyl 0.060 0.000 0.000 0.060 34.086 126.104 27.030 1.623 0.543
23 B3 246.940 22.138 Nyl Nyl 0.045 0.009 0.000 0.063 33.294 70.933 46.937 1.504 0.533
24 A3 220.000 23.289 Nyl Nyl 0.045 0.010 0.000 0.065 30.901 70.933 43.563 1.327 0.528
25 G3 196.000 24.451 Nyl Nyl 0.045 0.013 0.000 0.071 31.652 70.933 44.622 1.295 0.578
26 F3 174.610 25.626 Nyl Nyl 0.050 0.013 0.000 0.076 31.858 87.572 36.379 1.243 0.623
27 E3 164.810 26.816 Nyl Nyl 0.050 0.016 0.000 0.082 35.641 87.572 40.699 1.329 0.706
28 D3 146.830 28.023 Nyl Nyl 0.050 0.018 0.000 0.086 33.695 87.572 38.477 1.202 0.717
29 C3 130.810 29.250 Nyl Nyl 0.055 0.020 0.000 0.095 35.529 105.962 33.530 1.215 0.813
30 B2 123.470 30.503 Nyl Nyl 0.055 0.020 0.000 0.095 34.424 105.962 32.487 1.129 0.800
31 A2 110.000 31.788 Nyl Nyl 0.060 0.020 0.000 0.100 33.083 126.104 26.235 1.041 0.828
32 G2 97.990 33.112 Nyl Nyl 0.060 0.028 0.000 0.116 37.449 126.104 29.697 1.131 1.011
33 F2 87.310 34.484 Fib Cop 0.051 0.009 0.000 0.069 48.271 106.227 45.441 1.400 1.404
34 E2 82.410 35.914 Fib Cop 0.051 0.009 0.000 0.069 46.645 106.227 43.911 1.299 1.380
35 D2 73.420 37.415 Fib Cop 0.055 0.010 0.000 0.075 48.101 123.543 38.934 1.286 1.533
36 C2 65.410 39.000 Fib Cop 0.060 0.012 0.000 0.084 54.220 147.027 36.878 1.390 1.861

TOTAL TENSION FROM ALL THE STRINGS = 1014.683 lb
 
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ABBREVIATIONS DESCRIPTION
=========================
ST# = String number FREQ = Frequency of the note LENG = Length in inches
WMAT = Wrap Material CDIA = Core Diameter in inches WDIA = Wrap Diameter in inches
CMAT = Core Material BDIA = Bedding Diameter in inches ODIA = Overall Diameter in inches
IMP = Impedance BRPT = Breaking Point in lb TEN% = Tension in percentage of Breaking point
NOTE = Musical Notation TENS = Tension in lb T/L = Tension divided by Length

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