NK BIOTECHNICAL CORPORATION
The NKB Slim-3 is a 3 component sensor capable of measuring lift,
drag, and pitching moment of wind tunnel models. It is available in a
variety of force-moment envelopes, and may be customized to suit your
needs. Its dimensions (2 in. high x 4 in. long x 0.6 in. thick) enable
the use of a thin strut to minimize tunnel blockage. It is an excellent,
low cost alternative to in-line multi-component sensors. Models may be
mounted directly to the sensor, or be mounted on an optional sting,
which is attached to the top of the sensor.
The Slim-3 sensor is designed to be mounted at the top of a
Fixed Strut, to maximize the accuracy
of lift and pitching moment measurements.
Data acquisition systems and
Calibration systems customized for this
sensor are also available.
The NKB Slim-3, installed in a fixed strut with sting and sting
windshield
NK BIOTECHNICAL CORPORATION
The NKB Rock sensor is available with either 3 or 5 components.
The 3 component sensor is capable of measuring lift, drag, and pitching
moment, while the 5 component model also measures side forces and yawing
moment. Both are available in a variety of force-moment envelopes, and
may be customized to suit your needs. It is designed to be used where
aerodynamic loads or model weight exceed the capacity of the Slim-3
sensor
The Rock sensor is designed to be mounted at the bottom of a
Fixed Strut, below the tunnel floor. A
windshield covering the strut is recommended to eliminate tare forces
due to strut drag.
Data acquisition systems and
Calibration systems customized for this
sensor are also available.
NK BIOTECHNICAL CORPORATION
NKB Sidewall Sensor viewed from outside the tunnel
The NKB Sidewall sensor is available with 3 or 5 components in 3
load envelopes. Three component models include measurement of drag,
lift, and pitching moment, with roll and yaw included in the five
component models. Load envelopes are listed below.
| Components |
Loads |
| Drag |
10 Lb |
25 Lb |
50 Lb |
| Lift |
10 Lb |
50 Lb |
75 Lb |
| Pitch |
15 In-Lb |
45 In-Lb |
75 In-Lb |
| Roll |
5 In-Lb |
25 In-Lb |
35 In-Lb |
| Yaw |
20 In-Lb |
45 In-Lb |
75 In-Lb |
The Sidewall sensor includes the capability to vary angle of attack
±30°.
NK BIOTECHNICAL CORPORATION
BOUNDARY LAYER DRAG SENSOR
The NKB Boundary Layer sensor is designed to be mounted in the
floor of a wind tunnel, and is used for direct measurement of boundary
layer drag forces. This two component sensor also enables the user to
calculate the lateral location of the force vector.
Sensor Construction
- Machined from TI 6AL-4V Titanium
- Semiconductor strain gages
- Natural frequency of 1 kHz
|
Typical Calibration Results |
|
Applied Load (g) |
Measured Total Load (g) |
Sensor 1 (g) |
Sensor 2 (g) |
Vector Location, Lx, mm |
|
227 |
227 |
113 |
114 |
0.61 |
|
454 |
454 |
226 |
228 |
0.71 |
|
681 |
682 |
340 |
342 |
0.69 |
|
908 |
909 |
453 |
456 |
0.64 |
|
1134 |
1136 |
566 |
570 |
0.56 |
|
908 |
909 |
453 |
456 |
0.64 |
|
681 |
682 |
339 |
342 |
0.66 |
|
454 |
454 |
226 |
228 |
0.81 |
|
227 |
227 |
113 |
114 |
0.99 |
|
