Ronald Han Muller

US Patent:

20120160965, Jun 28, 2012

Filed:

Dec 23, 2010

Appl. No.:

12/977397

Inventors:

Ronald M. Muller - Upper Marlboro MD, US

International Classification:

B64G 1/28

US Classification:

244165

Abstract:

A method includes providing two or more momentum wheels arranged for rotation on a spacecraft in a momentum-canceling set. The method further includes causing the two or more momentum wheels in the momentum-canceling set to rotate at momentum-canceling speeds. Additionally, the method includes reducing rotational speed of a momentum wheel in the momentum-canceling set to initiate a slew of the spacecraft.

US Patent:

51113457, May 5, 1992

Filed:

May 26, 1989

Appl. No.:

7/357928

Inventors:

Ronald M. Muller - Upper Marlboro MD

Assignee:

The United States of America as represented by the Administrator,
National Aeronautics & Space Administration - Washington DC

International Classification:

G11B 509
G11B 1722
G11B 374

US Classification:

360 48

Abstract:

A disk memory device is provided that will maximize the storage capacity of a memory disk while at the same time maximize the record and playback data rate. Two recording disks are mounted upon a common shaft that is rotated at a fixed speed. Each disk has a recording area including a surface upon which data can be recorded/read in the form of tracks arranged either in concentric tracks or in a spiral. The recording area surfaces are divided into multiple concentric track groups. Two read/write heads and two head positioning servos (including electronic controls) are mounted such that each disk recording surface can be read out or written by the read/write heads. Each track of the multiple track groups of the first disk are given designated numbers beginning with the outer track of the outermost or edge track group and continuing in higher consecutive numbers until the inner track of the innermost track group is designated. However, each track of the multiple track groups of the second disk are given designated numbers in the exact reverse order of the first disk, such that the combined length of a track from the first disk, when added to the length of the same numbered track of the second disk is a constant, generating a constant data rate for the disk memory device.