Model rocket Recovery Methods
Model and high-power rockets are designed to be safely
recovered and flown repeatedly. The most common recovery methods are parachute
and streamer. The parachute is usually blown out when the engine's recoil
creates pressure and pops off the nose cone. The parachute is attached to
the nose cone, making it pull the parachute out, and make a soft landing.
Tumble recovery
The simplest approach, and one only appropriate for
small rockets or rockets with a large cross-sectional area, is to have the
rocket tumble back to earth. Any rocket which will enter a stable, ballistic
trajectory as it falls is not safe to use with tumble recovery.
Nose-blow recovery
Another very simple recovery technique, used in very
early models in the 1950s and occasionally in modern examples, in nose-blow
recovery the ejection charge of the motor ejects the nose cone of the rocket
(usually attached by a shock cord made of rubber, Kevlar string or another
type of cord) from the body tube, destroying the rocket's aerodynamic profile,
causing highly-increased drag, and reducing the rocket's airspeed to a safe
rate for landing. Nose-blow recovery is generally only suitable for very light
rockets.
Parachute/Streamer
The approach used most often in small model rockets.
It uses the ejection charge of the motor (see below) to deploy, or push out,
the parachute or streamer. Air resistance slows the rocket's fall, ending
(hopefully) in a smooth, controlled and gentle landing.
Glide recovery
In glide recovery, the ejection charge either deploys
an airfoil (wing) or separates a glider from the motor. If properly trimmed,
the rocket/glider will enter a spiral glide and return safely. In some cases,
radio-controlled rocket gliders are flown back to the earth by a pilot in
much the way as R/C model airplanes are flown.
Some rockets (typically long thin rockets) are the proper
proportions to safely glide to Earth tail-first. These are termed 'backsliders'.
Helicopter recovery
The ejection charge, through one of several methods,
deploys helicopter-style blades and the rocket auto-rotates back to earth.
The helicopter recovery happens when the engines recoil creates pressure,
making the nose cone pop out. There are rubber bands connected to the nosecone
and 4 blades. The rubber bands pull the blades out, and let them copter down.
From Wikipedia, the free encyclopedia.
All text is available under the terms of the GNU Free Documentation License.
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