Time to release altitude defines economics of towing operations.

Note that each dot represent one tow. In the data there are 53 tows now. More will be added.

Data is gathered from test tow, with different gliders, different release altitudes, different pilots and different conditions. From data the mean rate of climb from liftoff to release altitude is calculated, and this mean rate is used in the followign graph. It shows the time to 500 meters altitude (1640 feet) as a function of glider weight. Lines are statistical predictions from the data.

Same data as rate of climb.