I have made up 20 of these from some plastic sheet in the workshop this morning.
170x130mm
50x50 patch of 3M self adhesive reflector ( left over from a track marking contract ) on both sides to catch any ambient light.
Have also ordered some white luminescent tape and will add a 50x50 patch when it arrives.
These will do for this week.
Im expecting it to be wet and usually very misty and cold where I will be working at altitude.
So this should create some data regarding effectiveness in my application.
Longer term this could be a very sustainable alternative to four etc.
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