A research program was conducted to compare holdover times for natural and artificial snow, and to evaluate the general functionality of a second-generation snowmaking system developed by National Council for Atmospheric Research (NCAR) under contract with the Federal Aviation Administration (FAA). Prior to fluid testing, multiple fan position calibration and artificial snow distribution tests were performed by APS Aviation Inc. A total of 62 Type IV tests and 17 Type I artificial snow tests were conducted on two separate occasions at National Research Council Canada's Climatic Engineering Facility in Ottawa. The fluid failure calls were made according to holdover time flat plate failure call standards. Type IV fluids were tested at neat, 75/25 and 50/50 concentration, and Type I fluids were diluted with hard water to obtain fluids with a freeze point 10 degrees C below ambient air temperature. Tests were conducted at -3 degrees C, -14 degrees C, and -25 degrees C. The NCAR snowmaking machine was operated according to the guidelines set forth by NCAR in the operation manual supplied with the system. The artificial snow exhibited significant differences from natural snow. The failure times observed for most Type I and Type IV fluids were shorter than the holdover times published. The snow distribution produced by the snowmaker does not satisfy the requirement of fluid endurance time in the SAE Proposed Aerospace Standard 5485.


  • English

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 172 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00988827
  • Record Type: Publication
  • Report/Paper Numbers: TP 1366E, Final Report
  • Contract Numbers: T8200-9-9563/001/XSD
  • Files: TRIS
  • Created Date: Apr 14 2005 12:00AM