Return-Path: Sender: (Marvin Kaye) To: lml Date: Sun, 25 Aug 2002 01:36:49 -0400 Message-ID: X-Original-Return-Path: Received: from pop015.verizon.net ([206.46.170.172] verified) by logan.com (CommuniGate Pro SMTP 4.0b7) with ESMTP id 1711305 for lml@lancaironline.net; Sun, 25 Aug 2002 00:48:14 -0400 Received: from DG ([64.3.115.248]) by pop015.verizon.net (InterMail vM.5.01.05.09 201-253-122-126-109-20020611) with ESMTP id <20020825044811.IKQZ2139.pop015.verizon.net@DG> for ; Sat, 24 Aug 2002 23:48:11 -0500 X-Original-Date: Sat, 24 Aug 2002 21:48:15 -0700 From: David Glauser X-Mailer: The Bat! (v1.60) Educational Reply-To: David Glauser X-Priority: 3 (Normal) X-Original-Message-ID: <15121720875.20020824214815@gte.net> X-Original-To: lml@lancaironline.net (Lancair Mailing List) Subject: Re: [LML] Paint color and skin temp In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit There is a chart in the Europa build manual showing peak skin temperature as a function of ambient and paint color. The same chart can be found online at http://kr.abshier.org/newsletters/nl32.html, where it is attributed to an article in the September 1975 issue of Soaring magazine. The online chart is a bit hard to read - the lines are labeled, from bottom to top, white yellow and pink light blue and aluminum purple and blue light green orange and tan red and green brown black As an example, at various ambient temperatures, it shows 70 deg 90 deg 110 deg white 117 139 163 yellow and pink 125 147 169 light blue and aluminum 130 152 177 purple and blue 135 159 184 light green 142 167 192 orange and tan 149 173 199 red and green 166 191 219 brown 178 205 231 black 184 211 239 HTH, David On Saturday, August 24, 2002, 7:42:58 PM, Jim wrote: > DuPont have a tech bulletin that shows skin temps as a function of color (no mention of gloss as a factor). Their data show that black is something like 80 to 90 degrees hotter when sitting in the > summer sun than white. Pale greens, pale yellows, and very pale blues were not much different, but darker colors like Ferrari red and British Racing Green are getting up there close to black. > The more prudent course, it would seem to me, would be to confine dark colors to the underside or trim stripes, sticking with white or a light pastel for the upper surfaces. We sat on the ramp at > North Las Vegas the other day with an air temp of +44C -- what do you suppose a black plane would have topped out at? > Jim Cameron, N143ES