Color Versus heat

[Dust]

Most of us have seen the color versus heat chart and are going white, but what about

deepskyblue
deepskyblue2
deepskyblue3

gold
gold2
gold3
gold4
goldenrod
goldenrod1
goldenrod2
goldenrod3

and the many many other lighter colors.

Also - seems as the wings are more sensitive than the fuse, darker colors there? and course on the underside

[Dust]

Well - eracer has already shown that the wing foam leading edge can withstand summer temps and sunshine in the indiana or was it Illinois climate. my current plan is to paint, glassed, filled and sanded wing foam and test it myself on a visit to scottsdale AZ in the heat/sunshine.

my current picks are
deepskyblue
deepskyblue2
deepskyblue3

time and experimentation will tell

hoping for a 188 F day when i do it

[Dennis Passey]

That 'blue' would be a great looking plane, Dust.
Picture below is of a light yellow which is less temperature transmission but not quite as nice as the Corvette yellow wing and fuse striped Longeze owned by Tim Sullivan.. Thats a VERY nice color the way he did it [not whole plane] but he did do the strakes and wings- I'll have to see if I can find it on another older laptop Ive got.
Other pic is MY ABSOLUTE FAVORITE SCHEME that I will do on MY plane in honor of its owner. This is John Denvers longeze he crashed in here in Monterey, taken here in Calif just before it happened. Ive got Gary Hunterz podz in the garage and my plane will look just as close as is possible to John's. Somebody got his triple nickle N number already or I would've had that as well.

[Waiter]

This is my proposed paint scheem. The Grays may be a little lighter that those shown in the photo. I plan on performing several temperature color test to ensure I don't go over 150Deg F on the wings or canard.

Look at May 15 at;

http://www.iflyez.com/LongEZ_Retrofit_MAY_05.shtml

Waiter

[Dennis Passey]

Very snarky-Very cool..... put some bigg honkin disco ball strobes on it so you dont get pluto'd out of the sky by somebody who dont see you.

[mplafleur]

Originally Posted by Waiter

This is my proposed paint scheem. The Grays may be a little lighter that those shown in the photo. I plan on performing several temperature color test to ensure I don't go over 150Deg F on the wings or canard.

Look at May 15 at;

http://www.iflyez.com/LongEZ_Retrofit_MAY_05.shtml

Waiter

That is the king of snarkdom.

[Lynn Erickson]

Originally Posted by Dennis Passey

Very snarky-Very cool..... put some bigg honkin disco ball strobes on it so you dont get pluto'd out of the sky by somebody who dont see you.

don't thick the color will make much difference for being seen by others. there is nothing harder to see or find in the air then a eze no matter what the color. between the light colors and the small area they are very hard to see. put and eze in formation with a white RV and you will see the RV and not notice the eze until they are allmost on top of you.

[MarbleTurtle]

Install wig-wag flashers and use them on final. They'll treat you like an inbound jet until they realize otherwise... or so the theory goes.

[Wayne Hicks]

When I talked to the wig wag guy, he told me that a wig wag needed two filaments to work. Either you wig wag two lights, or you wig wag a single light that has a high and low beam filament in it. He said you couldn't wig-wag one light with a single filament. True?

The Cozy III that I fly has two aircraft lights -- one in the end of the port strake and the other in the end of the starboard strake. They wig wag back and forth. Others see the lights before they see the plane.

[ZG4Me]

Originally Posted by Wayne Hicks

He said you couldn't wig-wag one light with a single filament. True?

Generally.
Google search on "headlight modulator", used a lot in the M/C community. You can wig-wag a single filament. They flash medium bright to full bright.

http://www.kisantech.com/index.php?cat_id=2 is one.

Rick

[ddillon]

Originally Posted by Wayne Hicks

When I talked to the wig wag guy, he told me that a wig wag needed two filaments to work. Either you wig wag two lights, or you wig wag a single light that has a high and low beam filament in it. He said you couldn't wig-wag one light with a single filament. True?

The Cozy III that I fly has two aircraft lights -- one in the end of the port strake and the other in the end of the starboard strake. They wig wag back and forth. Others see the lights before they see the plane.

There is no reason that a single filament bulb could not be pulsed, via PWM, to oscillate between say 60% duty cycle and 100% duty cycle at a nice wig-wag rate of 1 to 5 Hz. I haven't researched it, but I would imagine that the motorcycle community already has products that do such a thing.

[Dust]

mmmm - maybe you are using gloss and the test was using flat!

I know t does not make sense, but could be a reason

[ddillon]

Originally Posted by Richard Riley

There's a chart listing ambient temperature, surface temperature and
color that composite builders take as gospel. I'm trying to get more
information about it

http://hallert.net/cozy/images/ColorCurveChart.gif

It originally comes from the Long EZ plans, Chapter 25, page 1 in the
plans and there's a handwritten note on the chart that says "Soaring
Sept 1975."

I have a call in to SSA, and they haven't been able to find a copy of
that issue. Does anyone have a copy?

In the testing that I'm doing, these temperatures seem high. White
surfaces don't seem to be more than about 10 degrees F higher than
ambient, the chart shows a white surface on a 30 degree day at 85
degrees. Yesterday it was hot in So Ca, 90 degrees ambient - but
black surfaces were coming out at 185, not 210.

If anyone knows what methods were used to gether these numbers, I'd be
thankful.

Highly un-scientific, but comparing the chart you linked to with a random one found on the web shows that yours reference (same as the Long EZ plans) shows higher temperatures.

[Waiter]

I've often suspected that this chart was reading high, but I've never followed up on it.

There were many occasions when I would leave my plane parked on the ramp in Fresno, Calif. in direct sun light, with an outside air temperature of 120 DegF. According to the chart, my plane should have been a pile of melted plastic (white @ 120 = 175 deg)

Although I know better, I swear I could put my hand on the plane and it was cooler than the OAT of 120

Spectral (glossy) or diffused (flat) reflections makes very little difference. The Sun hitting the surface at a direct angle would have the most impact, but I don't think even this would account for the discrepancy.

I've performed several preliminary color /temperature tests on my proposed colors and am confident that even if I park in Fresno in the future, I should still be able to put my hand on and surface without burning it.

Waiter

[cptomes]

Sounds like an opportunity for someone to build a sample coupon with a bunch of embedded sensors and paint colors.

I would guess that the surface temp might be lower than the temps under the surface, which is more critical. I don't know what the thermal properties of a finished composite are, but I do know that my house is insulated with both foamed plastic and glass fibers. So it seems to me that convection of heat to the air at the surface would be the only way to lose heat. The bottom of the layer of paint at the surface might be hotter?