ORIGINAL: GAP-RCU
//snip//
Seriously, one just needs to measure the time between pylons going both directions, then average the two to remove the effects of wind.
Although granted that is close enough for toy airplanes, that method does not "remove" wind effect.
Here is the question: A plane flies at 100 mph TRUE Air Speed. The distance between A and B is 100 miles. The plane will go from A ....to ....B, sharp turn around (disregard turn time) and back to A. There is a 20 mph steady wind blowing from B to A.
Plane flies the 200 miles at a True Air Speed of 100 mph with the 20 mph wind from B to A. The total time required for the trip is:
A. 2 Hours
B. Greater than 2 hours
C. Less than 2 hours.
D. None of the above.
While this sounds "off-topic" it really isn't. If one wishes to discuss airplane speed, then one should understand the subject.