Why most smart airplane owners want at least the top to be white!

On 08/15/2019 04:40 PM, Bill Prince wrote:
Burt Rutan did a study of his own back around 1985 or so, as his fiberglass creations were all sensitive to heat (room temperature-cured epoxy/fiberglass). There is no question that pure, unadulterated white is the best "color" to prevent thermal gain from direct sun. All other colors, cream, light yellow, even mirror experienced significant gains above just plain white.


On 8/15/2019 4:31 PM, Ken Hohhof wrote:

The difference between standard machine grey and just bright white spray paint from the hardware store is dramatic. I suspect everything beyond that is incremental.

Also back around 2005 when I ordered my first outdoor cabinet from DDB, I thought I wanted unpainted metal aluminum since all the traffic control boxes I see are plain metal or stainless steel. The salesperson said I absolutely didn’t want plain metal because it would get hot in the sun and what I wanted was the cream color.

*From:*AF <af-boun...@af.afmug.com> *On Behalf Of *Bill Prince
*Sent:* Thursday, August 15, 2019 6:19 PM
*To:* af@af.afmug.com
*Subject:* Re: [AFMUG] Solar load

If you look up insulating paint on Wikipedia, the entry there says all ceramic heat-reflective coatings are snake oil.

I did find a good discussion on Scientific American (https://www.scientificamerican.com/article/benefits-of-insulating-paint/). They don't exactly describe it as snake oil, but they also suggest that you not get your hopes up.

I suspect you can get your best results with a coat of reflective white paint, and try to keep it clean.


On 8/15/2019 1:12 PM, ch...@wbmfg.com <mailto:ch...@wbmfg.com> wrote:

    Be interesting to do a bake off between this and the plain
    “satellite white” I use.

    I have always found it interesting that highly reflective things
    like polished aluminum, chrome and silver paint seem to be really
    bad at reflecting heat/sun.  But we have all grabbed a chrome
    wrench that has been left in the hot summer sun and realized hot
    much it absorbs.  I am guessing what we see as reflective, Infra
    Red sees as flat black.

    *From:*Bill Prince

    *Sent:*Thursday, August 15, 2019 1:46 PM

    *To:*af@af.afmug.com <mailto:af@af.afmug.com>

    *Subject:*Re: [AFMUG] Solar load

    Which reminds me of this material that a friend clued me in on.

    You can get this at Home Depot (for example). It is pricey; around
    $250 per 5 gallon bucket, AND it needs a top coat of another
    material at near the same price. However, for an advertised
    reduction in temperature of over 60 degrees F, it may be worth a look.




    On 8/15/2019 12:35 PM, Lewis Bergman wrote:

        I remember Chuck doing a study on this same subject so I
        thought there might be some interest.

        Cabinet heat load

        Lewis Bergman

        325-439-0533 Cell


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