On Apr 16, 8:20 pm, "Mal" wrote:
I gather you dumped the water on the ground during this test.

The pressure on the dump valves in flight varies with speed of the glider.

I agree with Mal. On ground dump times may be interesting but they may
not be representative of in flight dump times. The only way to know
dump time at thermalling speed, as for a low save, is to measure it in
that condition. Similarly the only way to know dump time on a fast
final glide is to measure it in that condition.

I created a dump time graph for my 19b and taped it in the cockpit. I
ran a stop watch during a dump and could adjust the glide computer to
the new weight for a partial dump. I even considered building a
simple counter triggered by microswitches on the dump valves. Of
course I thought that function should be built into the glide
computer.

As I got older I found other things to worry about.

Andy