JTP posted the following above.
"There may be more accurate chronographs than the Magnetospeed. But especially in the wind we have around here I will NEVER go back to a chrono with skyscreens again. They are such a PITA. Tricky setup, missed shots, wind blowing the screens over, lots of gear."
JT - I have an Oehler 33, I have never had ANY of the problems you listed.
1 thing, I mounted my skyscreens PERMANENTLY in a 2X4 at exactly 5' c-c. I then put that 2x4 on a trash can, box or table. I have had so few missed shots as to say NONE.
edit to add:
<This is my 2nd board - 2x6, the skyscreen 3 were too big for the 2x4 w/o weakening it too much.>
Photo for demo purposes only.
The 33 is no longer produced but IF I could ,I get another when I need it.
Jerry