Specification

An adequate margin of bending and torsional stability must be shown for models and model support systems and must meet the following divergence criteria:

For all test conditions and configurations, the ratio of model airload increase due to a change in angle of attack (dN/da) to the support system restoring force generated by such an angle change (dFss/dQ) must not exceed one-half.

Aerodynamic Interference

The customer, after consulting the Test Manager, is responsible for providing a design that reduces aerodynamic interference to minimum acceptable limits, including models to be tested on Ames-furnished stings.

Model Support Hardware

Any customer-supplied hardware must be fit-checked and forwarded to Ames for verification at least 6 weeks before the test date. Taper fits must have at least 80 percent evenly distributed contact on each land. A report of fit-check results must accompany the hardware (see Appendices A, B and C). Taper fits will be verified at Ames using the fluorescent oil technique described in Appendix A.

If customer hardware is to match with Ames gauges, the gauge(s) will be provided at the customer's request by the Ames Test Manager.

An inventory of model support hardware available at Ames is listed in Appendix B.