 
Rubber Powered Model Airplanes: Comprehensive Building and Flying Basics Plus Advanced Design-Your -Own Instruction
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"The essence of free flight model aircraft is that the model's flight is not controlled by the flyer once the model
has been released. These models must be aerodynamically stable. If their flight is disturbed by a gust of wind or rising air current,
they must be able to return automatically to a normal flight path. This stability is achieved by a combination of the configuration and
proper trim of the model.
Free flight models may be broadly divided into four categories: Gliders (tow-line and hand-launched) Rubber-powered (pure duration, and scale with duration) Power (Co2, gasoline-powered, or electric) Indoor (pure duration, and scale with duration)
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When flown competitively, the usual aim is maximum flight duration. In the case of models flown outdoors, the modeller attempts to launch the model into rising column of air, a "thermal"t. These outdoor free flight models tend to be designed for two very different flying modes: climbing rapidly under power or tow, and gliding slowly while circling with minimum fall rate. Much of the challenge in designing and flying these models is to maintain aerodynamic stability in both modes and to make a smooth transition between them.
Models flown indoors do not depend on rising air currents, but they must be designed for maximum flight efficiency, because of the limited energy stored in the rubber or electric power source.
Within each category, there are different classes. Typically, there is an FAI world-championship class, a so-called mini class, an open class, and possibly any number of national or unofficial classes, for which regional or national competitions may be held. "
This information found: Wikipedia Encylopedia
Building and Flying Indoor Model Airplanes
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Dear Free Flight Fans,
I am writing to you in behalf of your Heavenly Father. He is seeking you like a lost sheep. You remember the Bible story? It is about a shepherd who has 100 sheep. But when he brings the sheep home one night, one is missing. He then leaves the 99 sheep and goes out into the wilderness until he finds that lost sheep.In this parable the shepherd goes out to search for the one lost sheep-the very least that can be numbered. So if there had been but one lost soul, Christ would have died for that one. To read more click Lost Sheep
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Free Flight model aviation. Non-radio controlled aircraft. Rubber, gas, electric, Co2 powered aircraft. Indoor or Outdoor.
Model Airplanes. Also several Flight Simulators to choose from. Flight Simulator.
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