**UPDATED EXPLORER FLIGHT INFORMATION - WIND

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Matthew Gardner
Posts: 1061
Joined: Sat Jan 05, 2013 11:19 pm

**UPDATED EXPLORER FLIGHT INFORMATION - WIND

Post by Matthew Gardner » Thu Mar 08, 2018 1:17 pm

For the information given in the EXPLORER manual:

Wind blowing from 270
Wind speed: w(t) = -(1/720)*t^2+25


Here is how our flight data judge solved the problem - updated from manual.

Wind direction = 90 degrees (blowing from 270 means the plane is pushed to 90)

Wind speed: w(t) = -(1/720)*t^2+25
Position = integral of velocity: p(t)=-(1/(720*3))*t^3+25*t

Degrees to Radians: 0.01745329


Solution:
Wind movement North/South: None
COS 90 = 0.

Wind movement East/West:
=SIN(Wind Direction*Degrees to Radians)*(-(1/720/3) * Time of Descent^3+25 * Time of Descent)
=SIN(90*0.01745329)*-(1/720/3)*(71.667^3)+25 * 71.667 = 1621.256 meters


Movement from Wind:
1621.256 m (Eastward movement: 90 degrees)
0 m (North South Movement)


Total Movement of Plane (from manual example)
-8564.752 meters (South from NAS Sand Point)
1022.350 meters (East from NAS Sand Point)

8625.554 meters at 173.193 degrees



The original values printed in the EXPLORER manual are not correct. Sorry for the error, the manual will be updated.


Good luck all.

Matthew Gardner
MATE Center

Matthew Gardner
Posts: 1061
Joined: Sat Jan 05, 2013 11:19 pm

Re: **UPDATED EXPLORER FLIGHT INFORMATION - WIND

Post by Matthew Gardner » Tue Jun 05, 2018 11:19 am

Hi EXPLORER class companies:

I have posted two additional practice examples on the EXPLORER website: https://www.marinetech.org/explorer_2018/

This document has two examples, one taking off from Sand Point Naval Air Station, and one taking off from Renton Airfield. On the following pages there are solutions to each example - with the relevant numbers for ascent, descent and wind.

Good luck.

Matthew Gardner
MATE Center

dymbe
Posts: 1
Joined: Sat Jun 09, 2018 1:46 am

Re: **UPDATED EXPLORER FLIGHT INFORMATION - WIND

Post by dymbe » Sun Jun 10, 2018 6:42 am

The same equation for wind is used in all of the given examples. Is it safe to assume that the same equation will be used at the competition?

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