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  Space News Business

Letters

posted: 01 June 2007
11:43 am ET







Incorrect Correction





The correction in the




May 21 edition of Space News [page 3] was not a correction, but a blunder any rocket enthusiast wouldn’t make. As a rocket scientist, who has mixed and cast a number of rocket motors, I must point out that that ammonium perchlorate is not a “rubber-like material” filling ATK‘s space shuttle boosters.

Ammonium perchlorate, as normally used in propellant formulations, is a white powder like substance. The “rubber-like” ingredient you refer to would be the binder for the propellant mixture, which is likely compo




sed of




aluminum as the fuel, ammonium perchlorate as the oxidizer, and a rubber-like binder to hold the mixture together.

As a longtime subscriber, I am surprised that you would make a mistake this huge.




Jim Vint

Westmont Enterprises

Nipomo, Calif.