Claims
- 1. A method for causing a gun-launched ramjet projectile to substantially follow a predetermined psuedo vacuum ballistic trajectory, comprising the steps of:
- providing a gun-launched ramjet projectile having a maximum thrust characteristic and also having a drag characteristic which is less than said maximum thrust characteristic;
- providing a means in said ramjet projectile for varying the thrust of said ramjet projectile in flight;
- accelerating said ramjet projectile in a gun to an initial velocity at which said ramjet is operative to provide a maximum thrust within the atmosphere;
- reducing the thrust of said projectile until its in-flight velocity substantially matches the drag characteristic; and
- varying the thrust of said ramjet projectile so that the thrust characteristic follows the drag characteristic causing said ramjet projectile to follow a pseudo vacuum trajectory.
- 2. A method according to claim 1, further including the steps of measuring the initial acceleration of said projectile, comparing said measurement against a recorded preselected velocity standard, providing a bias to adjust said thrust characteristic for any variation in the actual velocity of said ramjet projectile.
Parent Case Info
This is a division of application Ser. No. 217,970 filed on Dec. 19, 1980, now U.S. Pat. No. 4,428,293.
US Referenced Citations (9)
Divisions (1)
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Number |
Date |
Country |
Parent |
217970 |
Dec 1980 |
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