Propeller efficiency is determined by how well it converts rotational energy into thrust. Blade angles and design play a crucial role in propeller efficiency, which is measured as power in propeller-driven aircraft. The Wright R-3350 engine achieved 32% propulsion efficiency due to its turbochargers. Poor efficiency is caused by wind resistance and drag. Propeller efficiency […]
Backer rods are foam rods used to fill joints between building materials. They add stability, accuracy, and save time. Open cell rods are best for indoor use, while closed cell rods are better for outdoor use. They allow building materials to move and flex based on environmental factors. They are not essential but are useful. […]
Corporate-owned life insurance, also known as COLI or EOLI, is insurance taken out by a company to reimburse it upon the death of an employer. It was previously exploited by companies for tax-free benefits, but legal cases have made it less common. Companies must inform employees and gain consent to insure them. Corporate-owned life insurance […]
Propeller fans generate thrust using angled blades and are used for locomotion in airplanes and boats. The concept dates back to Archimedes, and was first proposed for propulsion in the 18th century. Propellers are based on Newton’s third law of motion and can have different numbers of blades. Incorrect specifications can result in a loss […]
Prop engines power propeller-driven aircraft and typically use high octane gasoline. They are similar to car engines and require annual inspections to prevent accidents. Carb heat controls prevent fuel from freezing at high altitudes. A prop engine is commonly a piston-driven internal combustion engine that powers a propeller-driven aircraft. With the exception of turboprop aircraft, […]
Property development involves making changes to real estate to support a desired function, either by acquiring natural land or adapting existing structures. Developers must comply with local standards and consider potential success before purchasing property. The goal may be short-term profit or long-term income. Sometimes known as real estate development, property development is the process […]
Folding propellers reduce drag and increase speed for sailing boats, but are more expensive and difficult to handle in reverse. They are suitable for boats over 20 feet and come with 2-4 blades. Self-propelled propellers offer even less drag but are more expensive. A folding propeller is a modern propeller designed for sailing boats so […]
Propeller aircraft, including helicopters, are popular for private, commercial, and military use due to their ease of operation, maintenance, and lower initial expense compared to jet-powered aircraft. Advances in design have allowed for fast speeds and long-range flight. The Red Barron and movies like Top Gun have romanticized fighter pilots and air-to-air combat. Propeller aircraft […]
Prop thrust is the force generated by a propeller to move a vehicle forward. Marine propellers achieve thrust by screwing into water, while aviation propellers change blade pitch to create thrust. Cavitation can cause thrust decay and damage to propellers. Adjustable pitch propellers can also act as a braking mechanism. Prop thrust refers to the […]
Property taxes are levied on an individual or business’s property and fall into two categories: estate and personal property taxes. Property tax exemptions can lessen or eliminate the burden of property taxes, with relief often offered to elderly or disabled people. Some states offer property tax relief in the form of a property tax/rental credit […]
Propeller turbines convert fluid or gas flow into rotary motion, with wind and hydraulic propellers being the two main types. They are used to generate electricity and mechanical work, with wind turbines being horizontal or vertical axis. Water propeller turbines, such as the Kaplan turbine, are commonly used in hydroelectric plants. Propeller turbines are cost-effective […]
Buttress threads have perpendicular leading edges and steeply sloped trailing edges, allowing for powerful force in one direction and quick release with minimal effort. They are commonly used in lead screws and hydraulic seals for viscous liquids. The term buttress thread is used to describe a specific screw thread design or profile. The distinguishing features […]
Propeller pumps are linear flow, impeller-type devices used in water treatment, chemical plants, and agriculture. They have large flow capacities, can pump suspended sand, and operate without priming. They can be installed vertically, horizontally, or angled and have helix bladed impeller heads. They are shallow duty pumps with low head values but can move over […]
Proposition 13 limited California property taxes to one percent of a home’s appraised value and restricted property value increases to two percent annually. It also required a two-thirds majority to raise taxes, causing controversy and decreased property tax income. Attempts to reform or abolish Prop 13 have been unsuccessful due to concern for older homeowners. […]
Proprietary trading is when a financial institution trades directly to make money instead of trading on behalf of clients. Traders receive a commission based on performance, which can encourage risk-taking. Proprietary trading requires skills such as clear communication, the ability to handle stress, and making split-second decisions. A proprietary trader is someone who does business […]
A property list is a list of key-value pairs used to describe attributes of a program or object. They can be saved to a file using XML, and are human-readable and platform independent. Property lists are used in data serialization and some operating systems have built-in support for editing them. A document type definition (DTD) […]
Rental property management software helps landlords manage rental properties, including tracking expenses and tenants, creating a tenant database, and tracking routine maintenance needs. It can also improve the quality of service for tenants and is flexible to meet the needs of different landlords and situations. Rental property management software is software designed to make it […]
Property management software is essential for managing commercial and residential properties. It offers features such as inventory functions, tenant profiles, document archiving, and automatic transactions. Templates can be created for various forms, and work orders can be easily tracked. Different software options are available for managing any number of properties. For anyone responsible for overseeing […]
A property master is responsible for props, equipment, and miscellaneous items needed for productions. They work with the production team to determine necessary fixtures and ensure all objects add to the quality and continuity of the production. No specific education is required, but experience in theater, television, or film production is desirable. A master of […]
Proportional dividers are portable tools used to transfer the proportions of a design from one scale to another. They are used by architects, engineers, and artists to scale a drawing up or down. Proportional dividers can convert drawings in ratios ranging from 1 to 1 to as much as 1 to 10 to 10 times […]
- 1
- 2
