Lord am I dated. I purchased my KR Plans in 1977 and there are only 68 pages and minus that chart That and the Tony Bingelis books have been my education over the years. No, I take that back....Tony Bingelis, move over! This forum and it's members has been equally a source of education and inspiration.
-----Original Message----- From: Mark Langford Sent: Sunday, November 03, 2013 7:55 AM To: KRnet Subject: Re: KR> Surface temps & paint Tim Witmer wrote: > Good info to have in my builders note books. Unfortunately I cannot get my > printer to copy it. It is too dark. Where did this information originate? It's page 116 of the KR2 plans. But just because it's printed, doesn't mean it necessarily applies to this conversation. We don't know anything about the test conditions or the intent of the chart. I suspect it may have come from a standard military test where the test specimen is subjected to some standard number of watts of heat per square foot on the outside and then temperatures are measured on the inside. This represents the worst case that military equipment will ever be stored at, in world's hottest desert on the equator at 2PM or something similar. I doubt anybody on this list will ever see these kinds of temperatures on the surface of a KR, mainly because the outside of your KR is air-cooled, and there's insulating foam just beneath them. I did some testing when I added my wing tips a couple of summers ago. The ambient temps were right at 100F. It was 108F in my hangar with the giant door open. I was curing the dark red paint on the bottom of the wings out in the sun because I was in a hurry to finish up the plane for the Airventure Cup Race the following weekend. Just for kicks I checked the temperature of the skin with a non-contact thermometer, and the number I got off my paint was 158F, which is a far cry from that chart, which predicts about 205F (see enclosed photo). Context of the chart matters. I leave a thermometer inside of my dark red car during the summer and the highest it's ever seen was 135F, with windows rolled up tight. I also checked the carbon fiber tips while it was out in the sun curing (before primer and paint), and it was only 165F, again a long way from that chart's 240 degree prediction. The stuff I do with my time... Mark Langford ML at N56ML.com website at http://www.N56ML.com -------------------------------------------------------- _______________________________________________ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options
