Fuel saving aircraft descent calculator

A manually operable calculator for calculating a beginning of descent position to optimize aircraft fuel consumption during descent from an actual altitude and distance to a target altitude and distance, comprising:

• a first member having a distance scale displayed thereon,
• a plurality of additional members, each of said additional members being alignable with said first member, and having respective altitude scales displayed thereon extending over substantially equal altitude ranges, each of said altitude scales being proportioned in terms of indicated air speed below respective predetermined altitudes to correspond to respective predetermined aircraft speeds,
• said distance and each of said altitude scales being respectively proportioned so that, when a target distance on the distance scale is aligned with a target altitude on a respective altitude scale, the actual altitude on said respective altitude scale is aligned with a desired fuel efficient distance on the distance scale for commencing the descent, and
• means mutually securing said first and additional members for relative aligned movement.

A manually operable calculator for calculating a beginning of descent position to optimize aircraft fuel consumption during descent from an actual altitude and distance to a target altitude and distance, comprising:

• a first member having a distance scale displayed thereon,
• display means having a plurality of altitude scales displayed thereon extending over substantially equal altitude ranges, each of said altitude scales being proportioned in terms of indicated air speed below respective predetermined altitudes to correspond to respective predetermined aircraft speeds and respectively alignable with said distance scale, each of said altitude scales extending over approximately equal altitude ranges,
• said distance scale and each of said altitude scales being respectively proportioned so that, when a target distance on the distance scale is aligned with a target altitude on a respective altitude scale, the actual altitude on said respective altitude scale is aligned with a desired fuel efficient distance on the distance scale for commencing the descent, and
• means mutually securing said first member and said display means for relative aligned movement.