A Jumprun
http://aviationweather.gov/products/nws/fdwinds/
The "Spot?"
NOTE: Actually we are calculating a mile long area in which the jumprun will be conducted.
The "spot" from the first calculation (1,2, and 3 below) is where the first group should exit.
|
FT
|
3000
|
6000
|
9000
|
12000
|
18000
|
24000
|
30000
|
340000
|
390000
|
|
BOS
|
2426
|
2726-09
|
2826-14
|
2930-21
|
2744-32
|
2751-41
|
275550
|
276050
|
276547
|
| 1. | Average the wind direction at 3,000, 6,000, 9,000 and 12,000. |
| 2. | Average the wind speed at 3,000, 6,000, and 12,000 feet |
| 3 | Calculate the 60-second freefall drift using the adjusted formula: in an average wind of 60 knots, and skydiver falling for 60 seconds, will drift one nautical mile in the average wind direction. |
| 4. | Plot the jumprun spot parameters (approximately one mile across the ground) using the winds aloft chart, aerial photo and compass headings above. Be sure to include canopy drift in 15 knot surface winds (from a 3,000 foot opening, to the 1000 foot "insertion point" where the landing pattern begins, as well). On this jump run there will be 6 groups, all pulling at 3,000 feet. (Click here for the correct answer and jumprun plot.) |
Skydive Pepperell Location
Latitude: 42 degrees 41' 77"N, Longitude: 71 degrees 33' 00'W
Magnetic declination = 15 degrees, 32 minutes West
Dropzone altitude: 175 feet above sea level.
Can I Jump Today? | How to read a "Winds Aloft" chart
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