Model Test with Yacht Dynamometer |
Designed for America's
Cup research, the Yacht Dynamometer is the most accurate in the world, giving
precise measurement of forces and moments on the hull of a sailing yacht over
full range of operational conditions. The precision of the dynamometer is used
to successfully quantify slight differences in hull design, providing a designer
with an accurate analysis of the hull motions. This unique precision has led
to improvements in the accuracy of experimental predictions for yacht hull design.
Comparisons with the full-scale performance of many different types of yachts
have given designers confidence that the results that can be produced by Oceanic
represents an accurate picture of how full-scale models will behave, greatly
reducing uncertainty in the prediction of performance.
With the use of the Yacht Dynamometer, Oceanic is able to investigate
all aspects of sailing yacht hydrodynamics and appendage performance for any
design. The equipment has been used on seven meter, one-tonne models, but it
is also applicable to less expensive models.
| |
|
| |
6 to 8m, 900 to 1200Kg, less with the use of counter-weighting, which
is available.
|
| |
to 7 m/s (0.2 % accuracy).
|
| |
|
| |
|
| |
± 5º |
| |
|
| |
+6º to -2º in ½º increments.
|
Heave |
± 30 cm |
Calibration |
to within 0.3% |
Misalignment Tolerance |
0.2º maximum, usually 0.05º. |
Measures |
Drag, Lift, Yaw Moment, Roll Moment, Pitch, Heave |
Seakeeping Test |
to within the pitch and heave spec. |
Natural Frequency of System |
6 Hz in drag, 4 Hz in lift. |
Related Projects:
- 2003 Swiss America's Cup Challenge - Tests involving comparative hull and
appendage evaluation.
- 1995 Australia America's Cup Challenge - Project completed by IOT evaluating
lift and drag forces on various models of the vessel design.
- Volvo Ocean Race - Performance evaluation involving variations in canoe-body
design.
|
