By Dana Bell
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Additional resources for A-10 Warthog in detail & scale - D&S Vol. 19
In particular, balloons on extended flights seemed to be drawn into low pressure systems, which often resulted in stormy landings. The basic hot-air balloon rip panel is a simple large sleeve at the apex that is drawn into a bunch and tied off with a cord. The cord is typically cut remotely by an electrically actuated explosive squib cannon or released with a pull cord moments before touchdown in order to deflate the envelope rapidly. This configuration is known as a pop top. , Velcro) closure that can be opened and closed progressively for finer adjustments in buoyancy.
The payload was attached directly to the base of the cone. By 1937 Piccard and his students at the University of Minnesota, including Robert Gilruth (later head of Project Mercury), had flown one of these unmanned balloons about 1,000 km (600 miles), carrying an automatic ballast-releasing device and radio instrumentation. Piccard dreamed of a stratosphere flight with a cluster of film balloons, but there was concern that they would become tangled. To test the concept, he made a successful solo flight in the Pleiades with an ensemble of 92 latex balloons on July 18, 1937.
Flight via airships enjoyed a brief popularity in the first decades of the 20th century. There are three types of airships. Non-rigid airships, commonly called “blimps,” are made of material similar to that used for the envelopes of gas balloons. Rather than a basket, however, an airship envelope is attached to a car that has rudders and a set of propellers driven by engines. Semi-rigid airships also are similar to blimps but have a metal keel running the length of the balloon’s base. Finally, rigid airships are made of a fabric envelope supported on a frame of metal.
A-10 Warthog in detail & scale - D&S Vol. 19 by Dana Bell