The Effect of Spoiler Deflection On Airplane Braking Performance

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Presentation transcript:

The Effect of Spoiler Deflection On Airplane Braking Performance John J. O’Callaghan National Resource Specialist – Aircraft Performance Office of Research and Engineering

Braking Forces on a Tire wing Direction of travel Friction (Braking) Force Ww = Weight on wheels Ww

Friction (Braking) Force Braking Forces on a Tire: Spoilers Stowed Wing lift reduces weight on wheels and braking force Lift wing Airplane Weight Friction (Braking) Force Direction of travel Weight on Wheels = Airplane Weight - Lift

Friction (Braking) Force Braking Forces on a Tire: Spoilers Deployed Spoilers reduce lift, increasing weight on wheels and braking force Lift Spoiler wing Airplane Weight Friction (Braking) Force Direction of travel Weight on Wheels = Airplane Weight - Lift

Typical Values of the Friction Coefficient m

Effect of Spoilers on Weight on Wheels: AA1420

Effect of Spoilers on Stopping Performance

The Effect of Spoiler Deflection On Airplane Braking Performance John J. O’Callaghan National Resource Specialist – Aircraft Performance Office of Research and Engineering