A dart is the free flying final stage of a sounding rocket, and contains the payload. Its form is very aerodynamically designed. After the launch stage burned out the dart is detached and continues to rise only with its own inertia.
Some sounding rockets are available both with or without dart. The version without a dart is able to transport more payload, but reaches lesser height.
Applications
References
Wikiwand in your browser!
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.