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The guide will provide a step-by-step process to calculate the wings required for a model aircraft based on its weight and wingspan. It also provides information about the type of engine that should be used in order to maintain safe flight. As always, it is provided free for public use. The table below will give you an idea of an average weight and wingspan for the various types of model aircraft. If you don't know the weight, or if both wings weigh the same, use the lower wing specification.Engine type: The choice of engine will affect your final results. This is because it will determine the airplane performance that you can expect from a model aircraft of a given weight and wingspan. In order to choose an engine, first use the engine calculator provided by your manufacturer to determine what size engine is appropriate for a given airplane. Also make sure your engine can handle a larger power system, as it will be necessary to calculate performance with a larger prop. WING SPAN WING SPAN Engine capacity & Power rating: Power rating of the engine is determined by the manufacturer. Step 1 - Calculate the area of each wing. Multiply its width by its length, then divide that number by 200. This will provide you with the wing area in square centimeters. The engine power rating is shown in kilowatts (Kw). The power rating usually refers to how much power the engine produces at an optimum altitude or sea level with a standard propeller running at approximately 2,800 rpm depending on the make and model of the engine. The power rating is usually the standard for all engines of a given type, but it may differ slightly from one model to another. Step 2 - Calculate the power required for flight. The formula below will provide you with the approximate speed necessary to fly your model aircraft at a given altitude, or at sea level with no wind. For example: For a 9" wing span model using an 80cc petrol engine, at 10,000 feet above sea level with adverse conditions, the average speed would be about 28 mph. By using this tool, you can determine the average speed required to fly each size of model aircraft at any altitude or sea level without wind. To calculate average speed at any altitude with no wind, subtract the calculated groundspeed from the desired airspeed. The following example below will compound the previous example, again at 10,000 feet above sea level with adverse conditions. The formula is now used to determine the approximate altitude needed to fly the model with the specified speed. The formula provided in Airplane dynamics for calculating aircraft performance will provide you with figure of merit performance numbers. Flight Time is very important during endurance testing which includes long duration flights of several hours or more. It is worthwhile establishing a minimum flight time that you can achieve for various models using different engine sizes and prop types. cfa1e77820
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