323- GROUND EFFECT

Question 1

Ground Effect Basics:

Makes the aircraft seem like it has a _________ due to decreased __________.

REMEMBER: High _______ = ______

Ground effect is more pronounced with a _______ Aspect Ratio

Reduced __________ = Increased _________

Difference between vertical lift and total lift is ____

Higher density air below the wing creates a high pressure = high energy and low pressure at wingtip relative to below so air flows and creates greater upwash less downwash and gives you a total lift vector closer to vertical left and therefore smaller induced drag.

Answer 1

Aircraft acts like it has a higher Aspect Ratio due to decreased induced drag.

REMEMBER: High Aspect Ratio = Low Induced Drag

Ground effect is more pronounced with a low aspect ratio.

Reduced Drag = Increased Airspeed

Difference is your induced drag.

Question 2

Less Induced Drag > acts like it has a higher _____

Higher Aspect ratio > ________ drag ______ speeds

Answer 2

Acts like higher Aspect Ratio

High Aspect Ratio> Lower Drag> Higher Speeds

Question 3

Drag Reduction with Ground Effect

1 wingspan = ____% decrease in Di
1/4 wingspan = ____% decrease in Di
1/10 wingspan = ________ % decrease in Di

Question: 35 foot wing span and you are 8 feet above the ground you reduce your drag by how much?

Answer 3

1 wingspan = 1.4% decrease in Di
1/4 wingspan = 23.5% decrease in Di
1/10 wingspan = 47.6 % decrease in Di

1/4 of 35 is roughly 8 feet so 23.5 %

Question 4

WIG planes

Answer 4

(Wings in ground effect)