Accession Number:

ADA626043

Title:

And the World Turned: Spin Testing the DG-1000S

Descriptive Note:

Journal article

Corporate Author:

AIR FORCE TEST CENTER EDWARDS AFB CA TEST WING (412TH)

Personal Author(s):

Report Date:

2015-10-01

Pagination or Media Count:

27.0

Abstract:

During the past 10 years, the Society of Experimental Test Pilots SETP has published over 250 new technical papers in its online database. Of these, only four of them less than 2 -- directly address the topic of spin testing. Since it apparently is not a test discipline many of us encounter, it might seem logical to question the importance of remaining knowledgeable of its precepts. A survey of the lessons-learned from the SETP spin papers that are available when compared to the lessons-learned of this project reveals a striking recurrence of themes. Seemingly minor aberrations in the aircraft mold line, for example particularly on or near the nose of the aircraft or wing leading edge have led to the discovery of unpredicted out-of-control behaviors and potentially-dangerous recoverability characteristics. In the face of such uncertainties, selecting an effective build-up approach has proven problematic in some cases. One of the goals of this paper, then, is to refresh understandings that could be needed on a moment s notice. It examines spin behaviors which were previously undocumented and unusual, identifies unexpected hazards, offers techniques to mitigate them, and proposes a new method of assigning spin mode modifiers for highlyviolently oscillatory spins. Finally, it is hoped it will serve as a readily-available primer on the topic of spin testing, while helping to banish certain preconceived ideas and attitudes which consistently prove self-critiquing in the flight test profession. On occasion, they even prove fatal.

Subject Categories:

  • Gliders and Parachutes
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE