Foro Modelismo

[doctorin]

solicito su ayuda, amigos. que color es el que usa el tanque del transbordador? gracias.
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Arriba las Chivas !!!!!!

[pantera g]

Según recuerdo, en un principio era blanco.

después los dejaron de pintar para ahorrar peso y lo dejaron al natural, así que toma un color anaranjado por el óxido, pero no llega al punto de corrosión...

a menos que lo hayan dejado sólo con un primer y omitieran la pintura final, por eso sea el tono anaranjado.

en este caso, con que llegues a un tono como lo vez en las fotos seria suficiente.

como te digo, es lo que recuerdo.
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La pregunta no es sí el modelismo es un hobby. Es un hecho.
La pregunta es qué eres tú: ¿Un modelista o un hobbista?
El modelista aprenderás de modelismo. Del hobbista, sólo pretextos.

[KpiRomm]

Buena noche...

paso link y transcribo parte

http://www.rocketryforum.com/showthread.php?22642-need-help-paint-color-Shuttle-fuel-tank

The first two ET's were painted white. After that, they have been the natural color of the foam insulation. The color of the foam varies a lot. The foam originally is much lighter in color. Both age, and especially exposure to sunlight, causes it to darken. Due to slips in launch schedules, some ET's sat in storage for a very long time, so they got even darker. Also, in some photographs the color may vary due to the exposure or lighting. The only truly really useful color comes from photos on the day of launch and even then it depends on the lighting, exposure, and film color sensitivity.

On tanks that look dark orange or rust, but also have lighter orange or yellow-orange places on them, what is that about? Two causes. One, where new foam was applied in places for various reasons. Such as building up the foam ramps that are along the right sides of the conduit lines. The other, where old foam was ground down or cut into for some reason. Only the outer part gets dark, like a "rind", so when the rind is cut away the exposed old foam is lighter in color.

More recent ET's, "Super Lightweight Tanks", first flown in June 1998, are even lighter. I do not know if the foam itself is any different, or if the ET's are being produced closer to the time of launch rather than being stored for a very long time. In any case, the tanks can have an almost butter-yellow color to them when they arrive, as seen below. When rolled out, they might look a little darker, but not much. The big thing is that being exposed to sunlight for weeks on the pad, the foam gets significantly darker. But the RSS covers a lot of the tank from direct sunlight. So when the RSS is rotated back for launch, the ET has a sort of a "sunburned look", the exposed areas are darker than the areas protected by the RSS.

-------------------

So, the “right” color really depends on what specific mission you are modeling. And if it is a mission since 1998 or so, some parts of the ET may be lighter/darker than others, due to the “sunburn effect” of most of the tank getting darker in the sunlight while other parts are protected by the pad’s RSS.

The ultimate scale model I built, was the only shuttle mission I ever saw launch, STS-47 in September 1992. On that one, the ET was more of a rust color. I simply used a cheap spray can of rust-colored primer which was a decent match.

Some examples below of various ET’s/missions.

Photo 1 - 1998 - first super light ET, on arrival at KSC

Photo 2 - same ET with STS-91 very shortly after arrival at pad, before RSS is rotated into place.

Photo 3 - Probably STS-91, not certain, shortly before launch. Note how much darker the ET is in most areas, due to the sunlight.

Photo 4 - STS-91 liftoff. Note how much darker the ET is in most areas, due to the sunlight.

Espero te sea útil.
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KpiRomm

"LAS ÁGUILAS VUELAN SOLAS... LOS PAJARITOS EN PARVADA"

[KpiRomm]

Más técnico:

Polyurethane foam is pale yellow when first applied (this is the color of the fuel tank for the indoor pictures). After being outside for a period of time, the color of the tank shifts to orange. As ultraviolet rays from the sun hit the outermost layer of the foam, the material begins to break down on the surface. This does cause a small loss in insulation quality.

Early on, NASA coated the the foam white to protect it from UV degradation. However, the paint added 600lbs with little benefit. Subsequent shuttles used bare, uncoated brown foam as a weight saving benefit.

The filled external fuel tank (orange) weighs nearly 1.7 million pounds and is primarily constructed with 1/8" thick aluminum. (así que no oxida como el acero ni en su característico color). Polyurethane foam was developed to insulate the outer layer of the tank, protect it from the external heat of the burning rocket fuel, and keep the contents of the tank super-cooled (-423 degrees Fahrenheit).

Insulation: 25 mm-thick polyurethane foam

The external tank is covered by three types of spray foam:

1-polyurethane foam: BX-250
2-polyisocyanurate foam: NCFI 24-124; used on the hydrogen and liquid-oxygen tanks
3-another polyisocyanurate foam: NCFI 24-57; used on lower hydrogen tank dome

Fuente: http://www.dura-foam.com/resources/foam-roofing/nasa-shuttle-fuel-tank/[/b]
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KpiRomm

"LAS ÁGUILAS VUELAN SOLAS... LOS PAJARITOS EN PARVADA"

[tierra_mojada]

[doctorin]

Que opinan de este color? tal vez mezclado con un poco de naranja? y donde se consigue la pintura que posteaste mi estimado? saludos a todos.
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Arriba las Chivas !!!!!!

[tierra_mojada]