>From the Cozy list:
Ernesto

Subject: COZY: Source for Aircraft Excrescence Drag report

So I've finally tracked down a source for a resonably-priced copy
of the classic AGARD AG-264 document, "Aircraft Excrescence Drag":
the United State Defence Technical Information Center.

The catch is you need to find someone employed by or funded through
the US government.  http://www.dtic.mil/dtic/regprocess.html explains
who's eligible to purchase material through them.

Once registered with DTIC (you need a DTIC User Code to place
an order), you can get a copy of the report by going to
http://www.dtic.mil/, selecting the "Technical Reports (STINET)"
button at the top, then following the "Search Scientific & Technical
Documents" link, and searching for "ADA 106030".  You should find
the report listed for $12.

For those unfamiliar with this document, it is a 172 pages long,
produced in 1981 by the Advisory Group for Aerospace Research
and Development (AGARD), and has been cited by efficiency nuts
like Klaus Savier.  The document covers inlets, outlets, drains,
leaks, fastners, surface roughness, steps, ridges, gaps, etc.

The abstract reads as follows:

  A review has been undertaken of the available data on the
  subject of the drag of excrescences on aircraft surfaces.
  Information from this review has been summarized and presented
  in a way that is readily usable for prediction and design
  purposes. The basic characteristics of boundary layers are
  discussed and, where possible, the drag of excrescences is
  related to those characteristics. In particular, because the
  size of many types of surface imperfection is small in
  comparison with boundary layer thicknesses, the drag of such
  imperfections can be correlated in terms of the properties
  of inner regions of the boundary layer. Several previously
  published analyses of this type are highlighted and, where
  possible, extensions to other data sources or other types
  of excrescence are presented. The practical problems of
  applying these data in the varying velocity gradients
  existing on aircraft surfaces are treated and one section
  is devoted to the drag of auxiliary air inlet and exit
  openings. Gaps in existing data which offer opportunities
  for research effort are pointed out.

If you are unable to find someone eligable to order through DTIC,
you can try two other sources, but I've always seen signifcantly
higher prices through these services:

  a quick search showed a price around $40: http://www.sti.nasa.gov/
  a quick search didn't reviel a copy here: http://www.ntis.gov/

 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.
ACRE NL web site.
http://home.earthlink.net/~rotaryeng/            http://www.linux.org