On Friday, November 27, 2015 at 2:12:24 PM UTC-8, Martin Gregorie wrote:
On Fri, 27 Nov 2015 12:49:50 -0800, ucanemailmoi wrote:

Imagine two gliders flying in Utah at the nationals at 17,000 feet 100
knots indicated under cloud street on opposite courses. Say the 100
knots indicated is 134 knots true. Closure rate 268 knots or 496 kph,
covering 2Km is about 1/4 a second warning. Just saying.

I think its a bit longer than that.

A closing speed of 496 kph is 138 m/s, so it will take 14.5 seconds
between first warning at 2km separation to the collision if nobody takes
avoiding action.


LOL. I think he meant 1/4 minute. At 110 kts at 17,500 and 40 deg F it's closer to 1/6 of a minute.

9B