propeller efficiency

propeller efficiency

[prə′pel·ər i‚fish·ən·sē]
(mechanical engineering)
The ratio of the thrust horsepower delivered by the propeller to the shaft horsepower as delivered by the engine to the propeller.

propeller efficiency

The ratio of the thrust horsepower to the brake horsepower, or the ratio of the thrust power delivered to the engine to the engine power required to turn the propeller. On an average, 20% of the brake horsepower is lost because of frictional losses; thus the thrust horsepower is generally 80% of the brake horsepower.
References in periodicals archive ?
The PBCF is an energy-saving device that reduces a vessel's fuel consumption by 3% to 5% by eliminating the hub vortex generated behind the rotating propeller and improving propeller efficiency. It was jointly developed by MOL, West Japan Fluid Engineering Laboratory Co., Ltd., and Mikado Propeller Co., Ltd.
The propeller efficiency increases when the number of blades increases view Figure 5 above; however, it is important to consider the cost-benefit ratio in regard to the number of blades.
Hempel's Systems for Hull and Propeller Efficiency (SHAPE) is based on the ISO 19030 framework and uses Hempel's world-class coatings knowledge from more than 100 years of experience.
Earlier, in response to the global shipping industry's continuing focus on fuel efficiency, the company launched its new Systems for Hull and Propeller Efficiency (SHAPE).
The objective function was set to maximize the propeller efficiency at the design point.
Varghese (2010) described a number of characteristics that increase propeller efficiency and presented an analysis of multiple designs.
For airplanes with props, we need to add in propeller efficiency. Propellers are designed to work best at certain airspeeds.
Emphasis will be placed on defining the interdisciplinary interactions and corresponding effects on overall propeller efficiency. Next, each of the analysis modules will be validated against simulated or experimental data.
In addition, it is known that PPs with shrouded propellers have increased propeller efficiency and decrease fuel consumption during the cruising flight mode (Udartsev et al.
Tacking to account a electronic driver module efficiency of 0,95 %, a electric motor efficiency of 0,9 % and also a propeller efficiency of 0,75 % we find a 0,64 % global efficiency of a entire propulsion system of the boat.
"The new, state-of-the-art hull design reduces water resistance and increases propeller efficiency providing not only an exhilarating performance at all speeds but also greater fuel economy."