See the mice (surface bats) problem here
The Bats problem - see please the video and the Mathcad 15 sheet in attach!
Can you show more nice (symmetric) plan of flyers!
See please the correct solution here
https://community.ptc.com/t5/PTC-Mathcad/Is-it-my-own-or-Mathcad-15-error/td-p/576164/page/2
One real bats problem