Power takeoff

A gas turbine used in aircraft must be capable of handling a wide span of fuel and air flows because the thmst output, or pressure, covers the range from idle to full-powered takeoff. To accommodate this degree of flexibiUty in the combustor, fuel nozzles are usually designed with two streams (primary and secondary flow) or with alternate tows of nozzles that turn on only when secondary flow (or full thmst power) is needed. It is more difficult to vary the air streams to match the different fuel flows and, as a consequence, a combustor optimized for cmise conditions (most of the aircraft s operation) operates less efficiently at idle and full thmst. 

Vapor compression refrigeration in which a vapor is compressed, then condensed with water or air, and expanded to a low pressure and correspondingly low temperature through a valve or an engine with power takeoff. 

Power available throughout, without circuit overloads local power takeoffs equipped with lockout provisions... 

Once the tractor became available (especially the tractor with power takeoff, or PTo), however, it was imaginatively adapted by farmers and mechanics to serve purposes its inventors had never imagined. 

Next, cut two holes in the screen for the power takeoff holes. Allow the silicone holding the cells to dry for 24 hours. 

Soldering the series connections and power takeoff tabs... 

Another variation of the classical belt is the double-V or hexagonal-V belt (Fig. 5.74). Double-V belts are used wheu power iuput or power takeoff is required ou both sides of the belt.This is necessary when the driver and driven sheaves must rotate in opposite directions. (Drives with several counter-rotating shafts are called serpentine drives.) Double-V belts are available in AA, BB, CC, and DD cross sections. 

Standard busway types, ampacities, components, and accessories are so numerous that almost any routing plan can be created. They can be enclosed or ventilated, installed indoors or ont, and nsed either as point-to-point power feeders, as mnltipoint power sources, or as continuous power takeoff routes. 

In the case of a fixed production system, electricity can be brought to the point of utihza-tion in rigid conduit or by any of the other means already discussed. Plants which require more flexible power distribution often rely on a grid of busways which permits circuit-breaker-protected power takeoffs at any point. 

Cast detachable chain (Figure 1-5) was introduced in 1873 and overcame many of the problems of cog chain. This chain was made of simple identical cast Unks that were easily coupled and imcoupled by hand. It greatly improved the performance of power takeoffs from cleated bull wheels in contaet with the ground under horse-drawn farm implranents. Thus, agricultural equipment was soon meehanized and the use of chain for drives rapidly spread to other major industries. 

Caught in or between pinch points Power takeoff (PTO) hazards Fueling... 

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