On 20/03/2008, at 4:50 PM, Texler, Michael wrote: >> It was quite invisible from more than 200 metres. > > Given two gliders flying each at 60 knots approaching head on at an > initial distance of 200m apart gives a time to collision of 3.2 secs. > > No time to react (i.e. from the time you see the threat, time to > realise you are going to hit, time to operate the flight controls, > time for aircraft to respond). > > Sadly it would seem that the disco ball is no good.
My understanding is that head on collisions are rare, and that the majority of collisions are in turns, side on and in peripheral areas. Also, there has been a lot of talk on the list about visibility of lights. My question - is this head on or peripheral. Peripheral vision can only see movement. Movement and flashing lights are far easier to see. So I wonder if the discussion regarding flashing lights being less visible is actual accurate. Also, much of the testing suggested in the list discussion anecdotal testing - it could be that people are comparing if something is visible or not suggests they would be looking straight forward. Visual testing of peripheral vision is very difficult to do, at Melbourne University we used to build very sophisticated systems to test user responses. So... I have no answers but maybe some more questions :-) Scott _______________________________________________ Aus-soaring mailing list [email protected] To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring
