through; equation (38) governs the production of the gas after the web has burned through. With propellant grains in

which there is no perforation or only one perforation, equation (38) is not needed because a zero web fraction

corresponds to the complete consumption of the propellant. These equations are close approximations of the true

geometrical form functions, and the coefficients are defined in terms of propellant dimensions.

Where:

Ke..................

0.8490

0.8362

0.8335

0.8316

0.8303

8 K1..................

0.9111

0.9300

0.9414

0.9490

0.9544

K2..................

0.0702

0.0938

0.1079

0.1174

0.1241

Ke..................

0.8563

0.8516

0.8487

0.8468

0.8455

10 K1..................

0.9447

0.9673

0.9808

0.9898

0.9963

K2..................

0.0884

0.1157

0.1321

0.1430

0.1508

Ke..................

0.8652

0.8603

0.8574

0.8554

0.8541

12 K1..................

0.9673

0.9923

1.0073

1.0173

1.0245

K2..................

0.1021

0.1320

0.1499

0.1619

0.1785

(1) *Equations of definition of volume.*

(39)

before telescoping tube stop

after telescoping tube stop

(40)

Where: