Rate Of Twist Calculator
Rate Of Twist Calculator . Calculate the resultant's square root. We choose to calculate the gaps (and hence the sail twist) at the battens, which are at 25%, 50%, and 75% along the mainsail leech, and at 33% and 67% along the jib leech. Twist Calculator Guide Berger Bullets Blog from www.bergerbullets.com ( sg s g) is the gyroscopic stability factor, and must be above 1.0 if the bullet is to remain stable. Muzzle velocity times 720 = x. X divided by your barrel twist rate = bullet rpm.