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T-37 accelerated spin

Asked by: 1359 views Aerodynamics

I was wondering how a t-37 erect decelerated spin can be converted into accelerated by placing full opposite rudder slowly i.e 4 seconds from stop to stop? won't the aircraft will spin faster with neutral rudders or with the rudder in the same direction of the spin?

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1 Answers

  1. Best Answer

    Jim Warren on Jul 06, 2015

    I’ve tried it all three ways, and the flight manual is correct-it requires anti-spin rudder.
    The reason is based on what we termed as the “ice skater effect.” Having anti-spin rudder has the effect of holding the tail up somewhat, permitting the nose to be closer to vertical, causing the spin axis to become closer to the lateral axis of the fuselage. That causes a slight decrease in centrifugal force and a corresponding increase in rotation rate. It is like an ice skater spinning with her arms straight out, then pulling them in close to her body. You can see the rotation rate increase as she does it. Pro spin or neutral rudder will increase the rotation rate, but not to as great an extent because the nose won’t be as close to vertical when the rotation rate stabilizes.

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