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. A number of past papers have detailed gearing theory, sizing, and efficiency calculations (Ref. 1). Past work at NASA has explored the optimum sizing of gearsets (Ref. 2). More recently, genetic optimization tools have been used to optimize gearboxes for terrestrial traction applications (Refs. 3–6). Genetic optimization algorithms are ideal for gearbox design due to the number of optimization variables that create discontinuities in the design space (Ref. 5). In this paper, a preliminary analytical gearbox optimization tool for electric vertical takeoff and landing vehicles is presented. Example gearbox sizing studies are carried out with the tool for electric multirotor type vehicles based on the NASA Revolutionary Vertical Lift Technology (RVLT) project 6-passenger quadrotor vehicle (Ref. 7). The section “Gearbox Genetic Optimization” discusses the details of the optimization tool. Example tool results are presented in the section “Example Design Optimization Results” for multirotor-type vehicles based on the RVLT quadrotor concept vehicle. The “Conclusion” section outlines future tool improvement and development plans.
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More about VAFEM:
VAFEM is devoted to providing high quality ball & roller bearings and related transmission parts for domestic and foreign customers in the Vehicle industry and Industries. Our products used in automotive and truck industry mainly include : wheel bearings, wheel bearing kits, wheel hub bearings, alternator bearings, tensioner bearings, clutch bearings, and gear box bearings etc. Our industrial bearings are mainly used in these fields such as Industrial Automation, Home Appliances, Reducers, Agricultural Machines, Precision Machine Spindles, and Transmission Systems etc. As a high-tech company specializing in bearings, we can not only provide stable and trustworthy quality products for OEM customers, but also provide non-standard bearings based on customers’ special requirements. At the same time, we can provide a series of complete product lines and have our own brand VAFEM, it stands for the abbreviation of value added for every movement, which has been recognized by more and more customers and end users.
2025 New Week VAFEM product Recommendation:
Clutch Release Bearing by VAFEM. Length: 1.9690". Outside Diameter: 3.1100". Inside Diameter: 1.7380". If you’re looking for premium-quality replacement automotive parts to keep your vehicle performing reliably, you can’t go wrong with superior-grade VAFEM products. Made using the finest materials and the latest manufacturing techniques, these parts deliver outstanding strength and wear resistance. They will serve you reliably year in and year out, ensuring a safe driving experience.
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2025-09-26