From: skunk-works-digest-owner@harbor.ecn.purdue.edu To: skunk-works-digest@harbor.ecn.purdue.edu Subject: Skunk Works Digest V4 #113 Reply-To: skunk-works-digest@harbor.ecn.purdue.edu Errors-To: skunk-works-digest-owner@harbor.ecn.purdue.edu Precedence: bulk Skunk Works Digest Monday, 10 January 1994 Volume 04 : Number 113 In this issue: Stealth house Re: Skunk Works Digest V4 #107 Re: Skunk Works Digest V4 #107 See the end of the digest for information on subscribing to the skunk-works or skunk-works-digest mailing lists and on how to retrieve back issues. ---------------------------------------------------------------------- From: urf@ki.icl.se (Urban Fredriksson) Date: Sun, 9 Jan 94 17:37:56 MET Subject: Stealth house The reason British Airways' new operations centre at Heathrow got a reduced radar cross-section wasn't for safety reasons, but to aviod allocate airspace to false returns. The wall facing the radar has only the lowest 460 mm vertical, above that it leans out 7, 14 and 21 degrees thus reflecting the radar energy down into a car-park, which is paved with concrete instead of asphalt which is more radar-reflective. Instead of silvered glass, there are protuding horizontal concrete sun-screens. Most of the walls are panelled with blue opaque glass. Glass-reinforced plastic was not suitable, as it absorbs water over time and becomes more reflective. The glass is ribbed so it scatters the radar energy. The metal containers on the roof for boiler and air conditioning units could not be changed, as they must be built to standards. Along the edges of the roof were placed radar screens, with recesses half as deep as the radar wave-length where the units were placed. All this resulted in a reduction of 20dB in radar-return power. The consultants from Dowty Signature Management have also recommended the planting of trees around the buildings. To aviod the buildings affecting the ILS system, they were not built parallel to the runway, but skewed 3 degrees. - -- Urban Fredriksson urf@icl.se ------------------------------ From: "Winn Schwartau" Date: Sun, 09 Jan 94 14:33:26 -0500 Subject: Re: Skunk Works Digest V4 #107 unsubscribe skunk-works-digest ------------------------------ From: "Winn Schwartau" Date: Sun, 09 Jan 94 14:33:26 -0500 Subject: Re: Skunk Works Digest V4 #107 unsubscribe skunk-works-digest ------------------------------ End of Skunk Works Digest V4 #113 ********************************* To subscribe to skunk-works-digest, send the command: subscribe skunk-works-digest in the body of a message to "listserv@harbor.ecn.purdue.edu". If you want to subscribe something other than the account the mail is coming from, such as a local redistribution list, then append that address to the "subscribe" command; for example, to subscribe "local-skunk-works": subscribe skunk-works-digest local-skunk-works@your.domain.net To unsubscribe, send mail to the same address, with the command: unsubscribe skunk-works-digest in the body. Administrative requests, problems, and other non-list mail can be sent to either "skunk-works-digest-owner@harbor.ecn.purdue.edu" or, if you don't like to type a lot, "prm@ecn.purdue.edu". A non-digest (direct mail) version of this list is also available; to subscribe to that instead, replace all instances of "skunk-works-digest" in the commands above with "skunk-works". Back issues are available for anonymous FTP from harbor.ecn.purdue.edu, in /pub/skunk-works/digest/vNN.nMMM (where "NN" is the volume number, and "MMM" is the issue number).