the parachute is a pretty good idea, it has definitely saved lives and driven sales for Cirrus since Textron (Cessna) just discontinued the TTx which was Cirrus' main competition.
as a pilot i have two problems with the parachute: 1. cirrus came up with the idea in order for the FAA to certify the aircraft because it has unstable spin characteristics. https://aviation.stackexchange.com/questions/22201/why-do-the-cirrus-sr-20-and-sr-22-have-the-caps-parachute-system 2. my other beef with the parachute is that it has caused some pilots to have a false sense of security and not fly with enough altitude between them and the granite clouds below (mountains) and there has been a couple crashes in our area because of it. you can't fix stupid. having said that, i'd love to have a parachute in my airplane!!! -sean oh and for the original post, paint the box white and install fans!!! On Mon, Jul 16, 2018 at 12:20 PM, Jason McKemie < [email protected]> wrote: > 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 >> >> >> >> > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > >
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