It received one star after its door unhinged and the passenger cabin roof bent into an inverted V shape during its crash test.

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Aluminum, being less dense than steel, has greater sound radiation, and yet the alloy-bodied SL summons a lush, refined quiet in the cabin to rival a fixed-roof car.

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Features include a 14, 000 log cabin, 82 ft long pool and glass lodge with retractable roof.

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Designers then came up with a spacious, wide-open cabin that looks out through a giant floor-to-roof windshield.

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But to our family, this modest brown cabin with its green trim and weathered, moss-covered roof is far more than just a summer vacation spot.

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So is an electrotransparent glass roof that allows passengers to control the amount of sunlight entering the cabin during the day, or, at night, to adjust the ambient lighting.

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It carries six passengers and two pilots, with nothing but identical window seats and transparent roof panels, since you will have the option of unbuckling and floating around the cabin during the zero-gravity portion of the flight.

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