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FORMS OF FLIGHT Slope soaring See Also: slope soaring Slope soaring uses the lift produced by Wind blowing up the face of a steep slope on Hill s, Mountain s, and Cliff s. Dynamic Soaring , ultilizing the leeward or "backside" of a hill, has recently become very popular. Thermal soaring Thermal soaring uses columns of warm, rising air called Thermal s to provide lift for a glider. They are normally launched with a Bungee cord catapult, a Winch , or towed by a powered plane. This is often combined with slope soaring. Thermals from elsewhere can drift in over the hill to combine with the hill lift or they can be formed by the hill itself, if the slope is angled to the sun causing the slope to heat up faster than in the surrounding areas. The resulting warm air will then flow upwards pulling in air from the valley below, causing a wind up the slope. The lift is thus a combination of ridge lift and thermal. This has produced new term, "slermal", to describe the mixture of both slope lift and thermal activity coming up the hill face. TYPES Flying wings Expanded Polypropylene (EPP) Flying Wing s have become very popular recently, primarily due to their strength. The Zagi is a very popular flying wing. They are often used for slope combat, where pilots try to knock other pilots' gliders out of the sky with their own. Scale gliders Scale gliders are models of full size gliders. Scale gliders are generally larger models (2m and over) and made from composite materials. PSS PSS, or power scale soarer, are scale gliders of full size powered aircraft. WWII prop planes such as the P-51 , Supermarine Spitfire and Me 109 are common subjects for PSS planes. However, modern Jet Fighter s or even commercial Airliner s have been recreated as PSS planes. POWERED GLIDERS Powered gliders use Electric Motor s, Internal Combustion Engine s or even Jet Turbine s to provide propulsion for a glider to get in the air. They are normally used to get thermal soarers in the air. SEE ALSO |
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