While we're going OT here, the Cirrus Airframe Parachute System seems like a good idea, in theory at least. What do you guys think of that setup?
On Monday, July 16, 2018, Bill Prince <[email protected]> wrote: > The Piaggio P.180 Avanti can do 400 knots for only $1.6 million. > > I've been in one. Nice bird. > > > bp > <part15sbs{at}gmail{dot}com> > > > On 7/16/2018 9:07 AM, Chuck McCown wrote: > > If I ever buy another plane I want it pressurized, certified for flight in > known ice and capable of doing 300 kts. > > *From:* Bill Prince > *Sent:* Monday, July 16, 2018 10:03 AM > *To:* [email protected] > *Subject:* Re: [AFMUG] How to reliably cool a small enclosure in direct > sunlight? > > > I sold it a few years ago. After we moved up into the mountains, the > round-trip time to the airport just made flying impractical (over an hour > each way). > > Yes. Same kind of plane. However JD made a number of bone-headed decisions > that made his demise all but a foregone conclusion. If we have a few > minutes at the computer museum, I can cover some of the more major bad > decisions that were made. Plus the fuel selector mechanism that had been > installed on that particular airplane was kind of a kluge on top of a Rube > Goldberg setup. Stupid. Stupid. Stupid. > > > > bp > <part15sbs{at}gmail{dot}com> > > > On 7/16/2018 8:57 AM, Chuck McCown wrote: > > Do you still have the plane? > Is that what John Denver was flying on his final trip? > > *From:* Bill Prince > *Sent:* Monday, July 16, 2018 9:44 AM > *To:* [email protected] > *Subject:* Re: [AFMUG] How to reliably cool a small enclosure in direct > sunlight? > > > When I was building the Long-EZ, there was a debate among fiberglass > airplane builders about the tolerable temperatures for ambient-temp cured > fiberglass/epoxy structures. The point being that too high heat would be > "very bad" for a fiberglass/epoxy airplane. > > So Burt Rutan and his crew did a bunch of tests using various colors. What > they found was that pure white had the lowest heat gain of any color. Black > the worst. Silver was right up there with gray. Almost any tint had a > significant heat gain over ambient. > > I painted my EZ pure white with no tints whatsoever. It did have blue/gold > trim colors, but the trim was basically just accent stripes on the fuselage > and winglets. > > > > bp > <part15sbs{at}gmail{dot}com> > > > On 7/16/2018 8:31 AM, Chuck McCown wrote: > > Foil or shiny silver stuff seems to draw more heat than black paint for > some reason. > > I think it is black in the infra red spectrum. > > Just leave a chrome plated wrench out in the sun for a few hours. > Black wrench will be much cooler. > You can actually pick up the black wrench but you can get a blister from > picking up and holding a chrome one. > > One of my kids still has a scar from the chrome tab of a car seat belt. > We knew she hated to be put in the car seat, figured all the screaming was > just the normal objections. > > *From:* Cameron Crum > *Sent:* Monday, July 16, 2018 9:24 AM > *To:* AnimalFarm Microwave Users Group > *Subject:* Re: [AFMUG] How to reliably cool a small enclosure in direct > sunlight? > > I wonder if the foil faced foam would work without having to paint and > stucco. > > Cameron > > On Mon, Jul 16, 2018 at 10:07 AM, Chuck McCown <[email protected]> wrote: > >> Doesn’t look like I emailed the test results to anyone. >> We started adding foam insulation with stucco and then white paint on the >> exterior of lots of stuff. >> An amazing combination. >> >> *From:* Chuck McCown >> *Sent:* Monday, July 16, 2018 9:00 AM >> *To:* AnimalFarm Microwave Users Group >> *Subject:* Re: [AFMUG] How to reliably cool a small enclosure in direct >> sunlight? >> >> Here is one snippit about exterior insulation: >> >> >> Infrared camera proved what I proved years ago. The exterior insulation >> does the trick. A wall in shade is the same temperature (inside) as a >> wall >> in sun. Therefore, false roof does not decrease heat flux. I spent one >> whole summer testing all these assertions. Multiple boxes with >> telemetry. >> Paint, sun shades, vents, etc etc. White paint and exterior insulation >> does >> the job. Nothing measurable came from adding a shade to that combination. >> >> But to prove it once again, I had Jeremy use the infrared camera to >> measure >> all the walls and ceiling in Ticaboo. Sunny walls were no warmer than >> those >> on the shade side. >> >> >> *From:* Lewis Bergman >> *Sent:* Monday, July 16, 2018 8:54 AM >> *To:* AnimalFarm Microwave Users Group >> *Subject:* Re: [AFMUG] How to reliably cool a small enclosure in direct >> sunlight? >> >> On peltier you also have to locate the power supply outside of the box. >> Or at least that is what I found. The heat load from the PS was always more >> than the peltier it powered could keep up with. Everything has a bit of >> inefficiency built in that shows up as heat. >> >> On Mon, Jul 16, 2018 at 9:52 AM Lewis Bergman <[email protected]> >> wrote: >> >>> Are you saying white paint outperformed heat shields? That's awesome >>> info. I always thought heart shields were the best. >>> >>> >>> On Fri, Jul 13, 2018, 7:43 PM <[email protected]> wrote: >>> >>>> I did a bunch of trials one summer testing a variety of methods >>>> including heat shields, exterior insulation, interior insulation, >>>> convection ventilation, forced ventilation, peltier effect active cooling. >>>> >>>> #1 by a long shot is painting the enclosure bright white. >>>> >>>> >>>> *From:* Bill Prince >>>> *Sent:* Friday, July 13, 2018 6:37 PM >>>> *To:* [email protected] >>>> *Subject:* Re: [AFMUG] How to reliably cool a small enclosure in >>>> direct sunlight? >>>> >>>> >>>> 1. Add a thermostatically controlled ventilation fan >>>> >>>> 2. Put a heat shield up on the south side of the enclosure. This can be >>>> just a plate of aluminum, painted white on the sun side, and mounted to the >>>> enclosure with 1" standoffs >>>> >>>> We have a site like yours, and just the fan keeps the temperature below >>>> 120° F (49° C). I think if we added the heat shield we could drop it >>>> another 10° F. >>>> >>>> >>>> >>>> bp >>>> <part15sbs{at}gmail{dot}com> >>>> >>>> >>>> On 7/13/2018 4:51 PM, Sterling Jacobson wrote: >>>> >>>> I’ve got a few side of the house enclosures exposed to direct sunlight >>>> part of the day. >>>> >>>> >>>> >>>> Inside the electronics are about ready to melt. Like 90C+ CPU temps. >>>> >>>> >>>> >>>> These are about 3’ x 3’ x 12 deep or something like that, so not a lot >>>> of room. >>>> >>>> >>>> >>>> What are you guys using to keep these things decently cool? >>>> >>>> >>>> >>>> -- >>>> AF mailing list >>>> [email protected] >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>> -- >>>> AF mailing list >>>> [email protected] >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>> >>> ------------------------------ >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> >> > ------------------------------ > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > > ------------------------------ > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > > ------------------------------ > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > >
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