balloon classification

Balloons are classified in two ways: according to their shape and to their volume. There are four types of balloon shapes: bulbous, those with a smooth gore, diagonal-cut gores, and straight-cut gores.
i. Bulbous gore balloons consist of 8 to 12 bulbous gores, with varying degrees of curvature. These types of balloons have an appearance akin to a pumpkin. Each gore is built up of specially shaped horizontal panels. Their design has little horizontal stress, thereby producing a very efficient envelope. The 12-gore version is suitable for artwork, but the more bulbous 8-gore does not present such a good surface for intricate designs, unless it is contained within one gore.
ii. The smooth-gore balloon's design consists of many narrow gores with very little curvature on each. The number of gores can vary but usually ranges from 20 to 32. This produces a smooth, flatter surface where the higher stresses make it a little more prone to damage but produce a better surface to carry intricate artwork.
iii. Diagonal-cut gore balloons have designs that give shape to the gores by using fabric on the bias. It is a style that gives rise to some very attractive diagonal color patterns.
iv. Straight-cut gore balloons have alternate gores with a completely straight run of fabric, thus making it easy to manufacture.
A balloon size is measured by its volume in thousands of cubic feet: 25' means a volume of 25,000 ft³. The international classification of hot air balloons is also by sizes. Various classifications of balloons are shown in the table.

单词	balloon classification
释义	balloon classification balloon classification Balloons are classified in two ways: according to their shape and to their volume. There are four types of balloon shapes: bulbous, those with a smooth gore, diagonal-cut gores, and straight-cut gores. i. Bulbous gore balloons consist of 8 to 12 bulbous gores, with varying degrees of curvature. These types of balloons have an appearance akin to a pumpkin. Each gore is built up of specially shaped horizontal panels. Their design has little horizontal stress, thereby producing a very efficient envelope. The 12-gore version is suitable for artwork, but the more bulbous 8-gore does not present such a good surface for intricate designs, unless it is contained within one gore. ii. The smooth-gore balloon's design consists of many narrow gores with very little curvature on each. The number of gores can vary but usually ranges from 20 to 32. This produces a smooth, flatter surface where the higher stresses make it a little more prone to damage but produce a better surface to carry intricate artwork. iii. Diagonal-cut gore balloons have designs that give shape to the gores by using fabric on the bias. It is a style that gives rise to some very attractive diagonal color patterns. iv. Straight-cut gore balloons have alternate gores with a completely straight run of fabric, thus making it easy to manufacture. A balloon size is measured by its volume in thousands of cubic feet: 25' means a volume of 25,000 ft³. The international classification of hot air balloons is also by sizes. Various classifications of balloons are shown in the table.
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