1. Naturally, the helix angle is the geometric complement of the lead angle . 2. Lead angle is the angle between the helix and a plane of rotation.3. Instead, the lead angle , which is equal to 90 degrees minus the helix angle, is given. 4. An equivalent comparison is when the friction angle is greater than the lead angle ( \ phi > \ lambda ). 5. Gun lead angles meant that gun-stabilizing commands differed from those needed to keep the director's sights stable. 6. Lead angles and corrections were added to the LOS data to generate the line-of-fire ( LOF ) data.7. The reticle pattern determines accurate firing of up to 400 metres and can predict the correct lead angle for a moving target. 8. Whether a worm and gear is self-locking depends on the lead angle , the pressure angle, and the coefficient of friction. 9. The helix angle references the axis of the cylinder, distinguishing it from the lead angle , which references a line perpendicular to the axis. 10. The usual autocannon burst consists of 3 10 projectiles and target lead angle is calculated for each burst ( fire without adjustment ) by computer.