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Drag Problem Set Answers
 

Glider #

Mass

Fw

drag at 2

drag at 3

drag at 4

drag at 5
             

Radians

-------------

-------------

0.03491

0.05236

0.06981

0.08727

Formula

-------------

"b4 * 9.8

"c4*$d$2

"c4*$e$2

"c4*$f$2

"c4*$g$2

1.0

0.5

4.9

0.1710

0.2566

0.3421

0.4276

2.0

0.9

8.8

0.3079

0.4618

0.6158

0.7697

3.0

1.4

13.7

0.4789

0.7184

0.9578

1.1973

4.0

500.0

4900.0

171.0

256.6

342.1

427.6

5.0

900.0

8820.0

307.9

461.8

615.8

769.7
6.0 1400.0 13720.0 478.9 718.4 957.8 1197.3

  1.  Compare the drag between model glider 1 and the full-sized glider 4 for all four angles. What conclusion can you draw?
    Same ratio as ratio of masses.

  2. Based on your answer in Question 1, would it be valid to use a model glider to study the drag on a full-sized glider?
    Yes

  3. What is the relationship between glide angle and drag?
    L/D = 1/2
    aL = D
    D=aL
    Therefore, drag varies directly to angle.
Please send any comments to:
Curator: Tom.Benson@grc.nasa.gov
Responsible Official: Kathy.Zona@grc.nasa.gov