[jacquesm]

Right up to the stall speed limit. You can't just keep pitching up, you'd have to apply some power too if you don't eventually want to run out of forward (air)speed.

In a glider you can't do that so there when in level flight you have a limited amount of forward momentum available to help you climb if the air itself isn't moving up, you are continuously trading altitude for speed and vv (easy to see in a dive: everybody expects you to gain speed in a dive because can all relate so something falling, it's obvious the reverse has to happen when you climb and the stall speed is a design parameter of the aircraft at a given altitude combined with a bunch of other factors).

https://aviation.stackexchange.com/questions/27693/how-does-...