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Most planes have a warning that intentional spins should be avoided but they get spun.
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This is just not true. Spinning an aircraft that is not approved is just plain stupid. The only people that do it are those who do not understand the aerodynamics.
There is a good reason it is not approved to spin.
Reason's like it does not recover for example.
Even aerobatic aircraft that must pass spin testing can enter unrecoverable conditions.
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"Mayday mayday mayday Pitts 260DB in an unrecoverable flat spin at 3,500 feet."
The airplane crashed in the Everglades, coming to rest partially inverted and nearly vertical in several feet of water. The canopy, which had been jettisoned in flight, was several hundred feet away. The bodies of the pilots were closer by the wreckage; both had bailed out, but there had not been time for their parachutes to open.
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Why did this aerobatic aircraft enter an unrecoverable condition in a spin?
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Only one aft limit for the CG is specified, but it assumes the maximum acrobatic weight; excessive weight exaggerates the effect of an aft CG position on spin recovery.
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The pilot failed to adhere to the Operating Limits as listed in the Pilots Manual. He violated the airworthiness of the design. The aft CG flattened the spin until the dirt barrier stopped it.
http://www.flyingmag.com/safety/acci...overable-spins
Easy to fly doing what? A few circuits of the field, cross country cruise, rolls or loop or two? Sure it was easy to fly.
Easy to fly is very subjective.
Longitudinal stability and control measurements and characteristics are not subjective. They are quantifiable characteristics with definitive limits.