AER Facilities

Services & Rates

Effective January 1, 2015


In addition to supporting UW A&A instruction and research, KWT performs subsonic wind tunnel testing organization for customers outside the department. KWT charges its customers in order to pay its overhead, support operations, and fund upgrades to its facilities. This guide describes the most common services KWT provides for its customers at the Kirsten Wind Tunnel. KWT also has access to other facilities and is capable of providing additional services. Please contact KWT if you have special testing requirements.


Rates for the Kirsten Wind Tunnel (8' by 12'):

Service or Item
Commercial Cost Basis or Rate
Facility Occupancy or Reservation
Regulary Occupancy (minimum: 9 hours per day)
$500 hourly cost basis
Overtime Occupancy
$600 hourly cost basis
$2700 per day
Electronic Pressure Scanning (EPS)
EPS Setup and Usage
EPS Usage
Unlimited, but it requires Occupancy
Powered Model Testing
Setup, Materials, Aux. Data
Call (may incur labor charge)
Variable AC Generator Usage
$100 per power-on hour
DC Electric (when available)
No add'l power-on fee
Combustion (customer's engine)
Reg. Occ. for air-out time during std. shift
PACCAR Turntable (Vehicle Ground Plane)
Vehicle Ground Plane is in storage
See below
2D Wall System
2D-Wall Installation
See below
2D-Wall Usage
See below
Formal Test Report
Extra Hardcopy Test Reports
$100 each
Extra CD or DVD
$100 each
Custom Services
Software Programming
$100 per hour
Electronics Support
$100 per hour
Machine Shop Labor
$100 per hour
Consumables, Shipping
KWT's Cost plus %16, plus sales tax
KWT's Cost plus %16


Sales Tax (or Use Tax) and UW Admin Institutional Overhead:

Washington State sales tax (or use tax (which has same rate)) does not apply to pure services or the incidental discs and documents normally output in the course of pure services. Therefore sales tax does not apply to most KWT charges. The exceptions are tangible items such as excess material costs or trip dots. Unfortunately, KWT cannot justify the expense of acquiring and maintaining a reseller certificate (nor can UW on KWT behalf). Therefore when KWT passes through the cost of such tangibles for the convenience of on-site personnel, the pass-through cost includes whatever sales tax KWT paid originally, plus KWT has to add sales tax again on the original total. In addition, payments on KWT invoices have approx. 16% deducted by UW Admin for F/A type overhead (utilities, grounds keeping, police). Pass-through costs put on our invoices will have this 16% applied too. (To not fully recover pass-through costs is strictly against UW rules.)


Description of Services and Related Policies

Daily Minimum Charge

KWT charges by the day.
An hourly cost basis is listed above because most inquiries and gov't subcontracts ask for costs to be evaluated in hourly increments. The minimum charge per shift is the shift length hours specified in the Work Agreement times the Regular Occupancy cost-basis, plus any Overtime Occupancy.

Thus, a traditional 9-hour, 7:30 AM to 4:30 PM, KWT daily shift costs 4,500.00 USD.

(Idle-Time is no longer applied hourly. Idle-Time is for complete days that are missed. See Idle-Time Policy below.

Tunnel Occupancy

Tunnel Occupancy begins with test section preparation for model installation and ends with model removal and test section restoration to the standard aircraft-testing configuration. The standard business hours are 7:30 am to 4:30 pm, Monday through Friday, excluding University of Washington holidays.
The shift length specified in the work agreement can run to 5:30 PM for a 10-hour standard day, for which the charge would be 5,000.00 USD. This is common for KWT's repeat, out-of-state customers. Waiting to decide on a day-by-day basis whether or not to run late is perfectly okay, but it incurs the higher Overtime rate and is difficult to promise since we may have to scramble to get available personnel.
Work Agreements have occasionally been made that specify 12-hour shifts, 6:30 AM start times, 8:30 AM start times, etc., etc., for various customer reasons, but they depended on staffing levels, seasonal bus schedules, and other circumstances. Inquire if non-traditional shifts are needed.

Tunnel Occupancy includes the following:

  • Tunnel rental including use of KWT PC's for viewing data and doing test-related tasks.
  • Personnel to operate the tunnel, reduce the data, and assist with model changes.
  • Support for force and moment data acquisition, flow visualization, digital photographs and video.
  • Reasonable amounts of office supplies and shop supplies.
  • Use of KWT Plotting and Wind Tunnel Data Organizer software packages.
  • Preliminary test data, digital images, and run logs on compact disk (CD-ROM or DVD-ROM) in PC format, prepared at the conclusion of the test.
  • Final test data, digital images, and run logs on compact disk (CD-ROM or DVD-ROM) in PC format, following completion of final data processing, if needed.

Overtime Policy

Overtime occurs whenever testing runs beyond the scheduled shift, or whenever testing is scheduled for a Saturday, Sunday, or University of Washington holiday. Overtime charges will be waived for time used to recover from Downtime. KWT cannot guarantee that Overtime will be available.

Idle-Time Policy

Occasionally customers may find themselves unable to continue with their test campaign. Perhaps a required model part is temporarily unavailable or the test matrix was completed ahead of schedule. If all KWT-provided services have ceased and the situation is such that KWT personnel can work on other projects, then the Company representative may request a switch to Idle-Time beginning the next day (assuming a multi-day test).
If the need to switch to Idle-Time occurs during a standard shift, the rest of that shift will be charged per the Regular Occupancy Cost-Basis (typically, data reduction, and other processing of test outputs continues to occur).
Charging in blocks of half-days can be discussed with KWT management.

(The old policy of having Idle-Time be an hourly thing created an amount of discussion grossly disproportionate to Idle-Time revenue. Also, one time, the rate for "Idle-Time" got copied into pricing forms supplied to a gov't customer agency, causing a contract rejection and subsequent cycle of paperwork revisions.

Downtime Policy

Downtime occurs whenever KWT is responsible for a problem that takes more than 15 minutes to resolve and that prevents proceeding with the test. KWT does not charge Tunnel Occupancy or Overtime rates during Downtime. Note that activities that are a part of KWT's standard operating procedures, such as calibration routines or tunnel checkouts, are not considered Downtime.

KWT makes reasonable efforts to ensure that its facilities are operational during scheduled tests. In the event that Downtime occurs, the facility will attempt to recover lost test time by offering additional test time, if available. For example, if the downtime causes a delay of one entire shift and no additional days are available after the scheduled end of test, then one option is to work extended (12-hour) shifts for the remainder of the test. KWT cannot guarantee recovery of lost test time.

Electronic Pressure Scanning

KWT has an Electronic Pressure Scanning (EPS) system, which is ideal for measuring large numbers of pressures. There is a per-test setup fee in addition to Occupancy time needed for doing the set up. There is no separate usage charge, but utilizing EPS requires zeroing, several minutes for a calibration run done on the order of each hour of usage, and other associated tasks. Attention to test management so that most EPS tasks are done in parallel to model changes, etc., keeps the impact on Occupancy low. If you would like to use EPS during your test please contact KWT to discuss your pressure measurement objectives.

Powered Model Testing - Variable AC Electric

Due to its infrequent usage, operation of the variable AC generator for AC Electric Powered Model Testing needs to be verified each time before KWT commits to making it available. Call for status. The applicable equipment is an Auxiliary Motor-Generator Set, which is suitable for powering high power density induction motors that can be placed in wind tunnel models.
For AC electric powered model testing there may be setup costs for hourly tech labor, and a power-on usage charge. Note that this type of setup involves wiring and cooling water tubing beyond what may be on hand, and will likely have a materials charge. Contact KWT to discuss your testing requirements.

Powered Model Testing - Combustion Engines

It is possible to do test runs with a test article’s combustion engine running.  Due to associated health hazards such as carbon monoxide exposure, a Standard Operating Procedure is must be followed that includes time for ventilation and requires that the carbon monoxide concentration in the test section and model deck drop to a safe level before personnel are allowed to work in those areas. There is no extra charge for this type of testing, but regular Occupancy Charges continue to accrue while ventilating during the hours of the Work Agreement's standard shift. Ventilation is done using two large exhaust fans on the top floor.
While airing out the wind tunnel circuit during recent powered tests with small, exhaust-producing engines, no CO was been detected in the Control Room or down in the KWT shop, so work still got done. It is recommended to make a run plan such that engine-on runs happen late in the day, so that the wind tunnel airs out overnight (no charges outside contract's shift time). Contact KWT to discuss your testing requirements.

Car or Truck Testing Using the PACCAR Turntable

The PACCAR Turntable (aka Vehicle Ground Plane) is in a UW warehouse near campus and has not been used since 2005. A wind tunnel test that utilizes the PACCAR Turntable will incur at least the Regular Occupancy charge. A policy on whether to charge setup and usage fees as was done in the past will be discussed when pertinent. Cost recovery for Q-calibrations and other turntable work will likely be desired.

2D Testing

The 2D Wall System is on hand, but has not been used since 2004. A wind tunnel test that utilizes the 2D Wall System will incur at least the Regular Occupancy charge. A policy on whether to charge setup and usage fees as was done in the past will be discussed when pertinent. Cost recovery for Q-calibrations, F/M Balance calibrations, and other 2D Wall System work will likely be desired.


Formal Test Reports - Hardcopies - Discs for Test Results and Reports

Some customers choose to have KWT produce a formal, Boeing ANP-Style report documenting test times, data reduction terms, data reduction equations, selected images, and pdf-versions of logs. Purchase of a test report includes printing and shipping of 1 or 2 hardcopies of the test report along with a disc (plus up to 3 copies) containing a digital version of the report in Adobe Acrobat PDF format, along with all of the test data and images. Additional hardcopies and discs may be purchased months or years after the end of a test depending on contractual or legal retention requirements.


Example of a Cost Estimate:

This example cost estimate is for a customer interested in conducting a wind tunnel test of an aircraft. Electronic Pressure Scanning (EPS) data will be collected during some of the runs in addition to standard force and moment data. The proposed test matrix totals 150 wind-on runs (each run is a set of test points where only one parameter is varied, such as the angle of attack or sideslip.) The test matrix also calls for 30 model configuration changes. The customer wants a test report and for KWT to supply trip dots.

Installation Time: 6 hours

Actual model installation times vary quite a bit depending on model complexity and the model manufacturer’s familiarity with KWT’s model support systems. Sometimes it’s as short as 2 hours, other times it’s 2 days. For this example, 6 hours is used as a rough estimate.

Wind-On Time For Data Runs: 18.5 hours

Assumes an average wind-on time of 7-8 minutes per run, including ramp up and ramp down. Run durations depend on number of test points and how much time EPS zeroes /cals add to data acquisition. Runs typically last 4-10 minutes at KWT.

Wind-On Time For Flow-Viz Runs: 2 hours

The time needed for Flow-Viz varies greatly. Smoke flow takes 30-60 minutes to set up, China Clay requires time for clean up, Mini-Tuft runs take about 60 seconds per test point for the photography, etc., etc.

Model Change Time: 10 hours

Assumes model changes take 18 minutes on average. Note that some model changes may take several hours.

Tunnel Checkout and Daily Calibrations: 2.5 hours

There are a few daily tasks that wind tunnel personnel have to take care of, such as running a Bal Cal twice per day, checking the tunnel circuits, and inspecting fan blades. Much of this occurs while customers are working on their models, but even so, plan on about 15-30 minutes per day for these tasks. They are considered part of Occupancy. If concerned, KWT can make Work Agreements for 8 hours per day at $562.50 per hour.

Contingency Time: 2 hours

If a test plan is so tight that it cannot include a couple of contingency hours, then consider contracting for longer shifts or more days..

Model Removal: 4 hours

Total Time Required: 45 hours (or 5 days at 9 hours/day)

Tunnel Rental: $22,250 (45 Occupancy hours at $500/hour)
EPS Set Up and Usage: $2,500
25 Feet of Trip Dots, including sales tax and UW's 16% overhead: $375
Test Report: $300

Total: 25,425.00 USD