When you build your estang or slostick consider id
The lap counter and the pilots (!) Need to tell them apart when they are
zooming around.
For the sticks the easiest thing is to make the vertical stabilizer unique.
Add some tape or paint or a number or something. That is what we used to do,
then we can tell them apart in the air.
An option for the estang would be wing or fuselage color.
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