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trailers: fiberglass vs. metal
Marc Ramsey wrote:
Lew Hartswick wrote: Shawn wrote: Some claim UV light can penetrate a fiberglass top and that the accumulated irradiation of the glider will cause damage to the ship. Shawn Have any of "some" ever done a transmission spectra of the material? Fat chance. Even window glass cuts of about 400 nm. ...lew... I suspect some UV gets through fiberglass cloth, it is a woven material, after all. Not all fiberglass trailer tops are created equally. Some are a few layers of glass supported by a steel tube frame, some are free standing glass/foam/glass sandwiches. Some have gelcoat on the outside, some are painted with polyurethane or acrylic. Some have dark opaque paint on the inside, some are just left bare. I had a trailer with a sandwich top, polyurethane on the outside, pretty grey spackle paint on the inside. I could read a book by the light that came through the top when I was closed up inside (the glider was also painted with polyurethane, however, no gelcoat to damage). This is also true of your canopy, but it still stops almost all the UV. The amount of visible light that penetrates is not a good indication of the UV shielding. I believe the resins used in composite construction do a good job of filtering, but I don't have any data for them. I had another trailer with a sandwich top, gelcoat outside, thick dark gray paint inside, it was totally dark inside. I had yet another trailer with glass on steel frame, the gelcoat deteriorated, so I had it sanded and repainted in white automotive acrylic. Within a year or two it was obvious which parts of the glider were facing upwards in the trailer, as those parts were distinctly yellower. I've seen a glider which had badly crazed gelcoat just in those areas that face upward in its fiberglass top trailer. This discoloration and crazing might also be caused the heat and dampness in the trailer. The upper foot or so inside a trailer can be very hot in the summer sun, much hotter than the outside air temperature. An aluminum top protects the glider from UV, even without paint. If I were to roll the trailer with the glider inside, I'd rather have an aluminum top. If I lived in a damp warm area, I'd rather have a fiberglass sandwich top with dark paint on the inside, as there would likely be a lot less condensation inside the trailer... Also my sentiments, though I would also consider an aluminum top that I insulated. -- Change "netto" to "net" to email me directly Eric Greenwell Washington State USA |
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