NASA

TECHNICAL ARTICLES | 2025-09-22

Genetic Optimization of Planetary Gearboxes Based on Analytical Gearing Equations

Future electric and hybrid electric vertical takeoff and landing vehicles will require high-efficiency and lightweight electric motor-driven propulsion systems. One key to designing an optimum electric motor-driven propulsion system, is to have a method for estimating the mass and efficiency of a gearbox for different power levels, motor speeds, and propeller speeds. Understanding the trade space for gearbox mass and efficiency allows the overall optimization of the propulsion system.

POWER PLAY | 2019-03-01

No Regrets Over Lost Opportunity

It was recently announced that the planet Mars has at least one thing in common with planet Earth: all good things come to an end. In this case, the good thing is the recently announced and documented (Feb. 12) demise of the Mars rover Opportunity.

TECHNICAL ARTICLES | 2017-12-01

Vibration and Operational Characteristics of a Composite-Steel (Hybrid) Gear

Free vibration and dynamic operation testing of hybrid gears at NASA Glenn Spur Gear Fatigue Test Facility; hybrid gears are compared to their steel counterparts.

PUBLISHER'S PAGE | 2016-04-01

He Shoots, He Scores!

There’s nothing quite as satisfying as scoring a goal. Here at Power Transmission Engineering, our goal is to provide you with as much relevant educational and technical material as possible, and every issue we strive to cover the subjects of power transmission and motion control from as many different angles as possible, so that no matter your job title, and no matter your industry, if gears, bearings, motors and related components are important to you, we’ve got you covered.

POWER PLAY | 2015-04-01

Whats In a Meme

Rosetta Mission mixes with Maxon, Kim K for one unforgettable photo

FEATURE ARTICLES | 2014-12-01

Getting a Piece of that Sweet Coupling Pie

He was out. Nine years ago, Ross Rivard left the coupling industry for the shimmering new world of luxury automotive components at Lacks Enterprises, where he was immediately enveloped by platinum trim systems and chrome composite wheels. It was glitz and glam and as sparkly clean as the fresh-fromthe-dealership cars his products were embellished onto.

POWER PLAY | 2013-08-01

Seabees

For the Seabees, hazardous construction zones have always been part of the job.