Let's consider this as an object moving thru space at an absolute speed and direction, lets not talk about airspeed yet. In your diagram the plane is moving up at a speed of 20 kts and has a certain amount of energy from it's motion, it is then directed to the left, loses 5kts and a portion of it's energy in the turn, and then proceeds to the left at 15kts with the remaining energy. To say otherwise is to say that it somehow instantly lost the energy that it has. Now we consider air speed. Moving to the left at 15kts it encounters air moving to the right at 20kts. The result is that air is moving over the plane at 35kts. If we can agree on this we can continue to analyze the rest of the scenario.
ORIGINAL: Lnewqban
Thanks, Larry.
I have modified the schematic; see the attachment.
It seems that your square loop cannot be performed properly with those velocities, because it will look like a bump to you.
Note the values in magenta that I have modified.
I know that it is confusing; I recommend trying the loop in calm conditions to have all the velocities correct, and then add wind velocity to see what happens.
I will be back on this tomorrow.
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Edited to insert quote codes in correct spots- bcm