Neat trick I learnt in Air Cadets: if your glider's pitot assembly is directly in front of your windscreen, you can tie a bootlace to it and it'll act as a turn and slip indicator, and you'd know if you're turning in a cloud. But the glider in the video doesn't look like it's set up like that.,(reply>), +The Canadian Railfan A piece of lace can't tell you whether you're turning, since the airflow it's measuring is determined by the yaw, not the rate of turn. If you look on the canopy you'll see we have a yaw string, and it remains centred in the turns. A turn indicator requires a gyroscope.