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Old February 10th 17, 02:42 AM posted to rec.aviation.soaring
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Default Turnpoint placement to support safer Tasking

It has been discussed that it is safest to prevent Out&Return/U-turn type tasks that have acute angles between legs.

Many turnpoint lists do not support this well because many of the turnpoints are not near another turnpoint to use for steering. So if you use the far out turnpoint and want to add a 90° turn, the next nearby turnpoint is really far, so it makes a huge impact to the task length.

I was thinking one solution might be to have turnpoints in pairs when possible. Maybe the ideal distance would be 10 to 20 miles to support a ~10 mile TAT turn area and a smaller one on the other.

Placing nearby and “perpendicular” to the home point would help most often to change Out & Return tasks to rectangular race tracks or bowties

I put some images here to illustrate the idea:
https://docs.google.com/presentation...it?usp=sharing

Related discussion “Task turn angles other than 180 degrees, when is it safe?”
https://groups.google.com/forum/?fro...ng/lREopFrhl10

I think for the 30 mile radius TAT is it not needed so much. But this would help for AST, MAT and TATs.
Please share your thoughts and ideas, do you agree with 10-20 miles spacing? Maybe 8-12 miles would be good for closer in points.

Chris