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Walk On
Water designs |
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Peter Hostetler |
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Hull |
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LWL |
30.00 |
DISP |
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4225.00 |
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BWL |
4.00 |
WET SA |
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111.00 |
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DRAFT |
1.25 |
VOLUME COEFFICIENT |
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2.4E-03 |
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VOLUME |
65.90 |
BWL/DRAFT |
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3.20 |
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SPEED |
RN |
CF |
RF |
CR |
RR |
CT |
RT |
EHP |
BHP |
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5.48 |
2.3E+07 |
2.6E-03 |
24.70 |
9.8E-04 |
9.28 |
3.6E-03 |
33.98 |
0.57 |
1.14 |
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6.02 |
1.5E+07 |
2.8E-03 |
32.08 |
1.2E-03 |
13.35 |
4.0E-03 |
45.43 |
0.84 |
1.68 |
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6.57 |
1.6E+07 |
2.8E-03 |
37.63 |
1.8E-03 |
24.77 |
4.6E-03 |
62.40 |
1.26 |
2.52 |
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7.12 |
1.7E+07 |
2.7E-03 |
43.58 |
3.1E-03 |
49.76 |
5.9E-03 |
93.34 |
2.04 |
4.08 |
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7.67 |
1.9E+07 |
2.7E-03 |
49.93 |
4.5E-03 |
83.68 |
7.2E-03 |
133.61 |
3.15 |
6.29 |
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8.22 |
2.0E+07 |
2.7E-03 |
56.67 |
5.5E-03 |
116.58 |
8.2E-03 |
173.25 |
4.37 |
8.74 |
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APPENDAGES |
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CONSTANTS |
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RUDDER |
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VISCOSITY OF WATER |
1.2E-05 |
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LENGTH |
AREA |
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GRAVITY |
32.20 |
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1.25 |
4.86 |
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H2O DENSITY |
64.00 |
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Gal/HP x HR |
0.05 |
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SPEED |
RN |
CF |
RF |
EQUATIONS |
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5.48 |
9.4E+05 |
4.8E-03 |
1.96 |
VOLUME
COEFFICIENT=VOLUME/LWL^3 |
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6.02 |
1.0E+06 |
4.7E-03 |
2.33 |
RN=SPEED(ft/s)*LWL/VISCOSITY
OF WATER |
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6.57 |
1.1E+06 |
4.6E-03 |
2.72 |
CF=.075/(LOG10(RN)-2)^2 |
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7.12 |
1.2E+06 |
4.5E-03 |
3.14 |
RF=CF*.5*H2O
DENSITY/GRAVITY*WET SA*SPEED(ft/s) |
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7.67 |
1.3E+06 |
4.4E-03 |
3.58 |
EHP=RT*SPEED(ft/s)/550((lbs*ft/s)/HP) |
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8.22 |
1.4E+06 |
4.4E-03 |
4.05 |
BHP=EHP/EFFICIENCY*MARGIN |
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Total Resistance |
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Range |
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ASSUMED EFFICIENCY |
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50% |
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TANK CAPACITY |
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6.50 |
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MARGIN |
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10% |
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SPEED |
HP |
RANGE |
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SPEED |
CT |
RT |
EHP |
BHP |
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5.00 |
0.86 |
752.60 |
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5.48 |
8.4E-03 |
33.98 |
0.57 |
1.26 |
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5.50 |
1.26 |
565.49 |
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6.02 |
8.6E-03 |
45.43 |
0.84 |
1.85 |
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6.00 |
1.85 |
421.39 |
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6.57 |
9.2E-03 |
62.40 |
1.26 |
2.77 |
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6.50 |
2.71 |
311.83 |
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7.12 |
1.0E-02 |
93.34 |
2.04 |
4.49 |
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7.00 |
3.97 |
229.39 |
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7.67 |
1.2E-02 |
133.61 |
3.15 |
6.92 |
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7.50 |
5.81 |
167.88 |
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8.22 |
1.3E-02 |
173.25 |
4.37 |
9.62 |
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8.00 |
8.50 |
122.32 |
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Notes |
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1) Residual Resistance
(Rr) calculated by interpolation of graphs published in Taylor Reanalyzed by Gertler. |
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2) Trimaran resistance
analyzed as if boards were raised, and ama resistance ignored for they only
displace 8 lbs at static waterline. |
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3) Propulsion is Yamaha
9.9HP Outboard mounted on bracket on transom with Tempo 6.5 gallon portable
tank. |
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