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This set includes FOUR separate models in either 1:1250 or 1:1200 scale. So you have a choice of scale and of material - please check your choices in the top right corner of this page.
Please note that the individual items are supplied "caged" together to avoid loss and damage - after the cage is removed there are NO sprues to cut away from the individual models.
This is the US Type D-5 dilatable barrage balloon, hydrogen filled and with an operation height of 7,500ft (termed "low altitude".)
Barrage balloons were basically of two types, ballonet and dilatable. The ballonet type had an interior ballonet or air chamber that permitted the outer hull to maintain shape as the lifting gas condition changed with altitude and temperature. Generally an air scoop employed wind velocity to maitain air pressure within the ballonet. The dilatable type had no seperate air chamber and was entirely filled with the lifting gas. The hull had elastic lacing or cords such that its aerodynamic shape was maitained during expansion and contraction of the gas inside.
During WW2 the US built considerable numbers of both types of balloons. The dilatable type was considered most efficient in regard to design, however, in actual operation the ballonet type proved to be more practical and could be constructed at significantly lower cost. The British shipped a large number of their Mark VII ballonet type balloons to the US to help with supply shortages.
In 1/1250th scale this finely detailed model of the D-5 is just 20.7 mm long (21.6mm in 1:1200 scale) and barely 9.5mm (9.9mm in 1:1200 scale) from top to botton of the tail fins. FOUR balloons are included in this set.
Each model has a nominal 1mm diameter hole for a mounting rod.