Relay-Version: VMS News - V6.0-3 14/03/90 VAX/VMS V5.5; site msus1.msus.edu Path: msus1.msus.edu!oldnews2.cis.umn.edu!zip.eecs.umich.edu!yeshua.marcam.com!news.kei.com!eff! usenet.ins.cwru.edu!howland.reston.ans.net!usc!elroy.jpl.nasa.gov!swrinde! sgiblab!sgigate.sgi.com!olivea!decwrl!decwrl!morrow.stanford.edu!morrow.stanford.edu!not-for-mail Newsgroups: rec.motorcycles Subject: Re: Painting Heatfins Message-ID: <2i8njm$an4@morrow.stanford.edu> From: MA.SPX@forsythe.stanford.edu (Stephen Parry) Date: 27 Jan 1994 07:45:58 -0800 Sender: news@morrow.stanford.edu Distribution: usa Organization: Stanford University NNTP-Posting-Host: morrow.stanford.edu Lines: 28 In article , stafford@ultra1.Winona.MSUS.edu (John Stafford) writes: >In article <2i3oo0$hku@news.service.uci.edu>, bbrodnax@orion.oac.uci.edu >(Bruce T. Brodnax ) wrote: > > >> That's fine if an *air*-cooled engine got rid of its waste heat by >> radiating it off... You might have noticed the highlighting in the >> previous sentence; air-cooled engines throw off heat by convection, which >> is impeded by the "crinkly" surface due to boundary layer f/x, etc. > > Theory, talk, blah, blah, blah. Cite some literature. > National Semiconductor lists the following values of Emissivity, E, the measure of a surface's efficiency of radiating heat; Polished Aluminum 0.05 Untreated Aluminum 0.2 Black Anodized Aluminum 0.7 to 0.9 Black Air Drying Enamel 0.85 to 0.91 Black Oil Paint 0.92 to 0.96 Source: Audio/Radio Handbook - 1980. As the Stones said "Paint it black"! Stephen K75RT