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The Fitchburg engine (illus.) [ii] was one of a series of similar engines offered in various configurations.The steeple arrangement required a high ceiling to the engine house, but had two advantages: [6] it took up less floor space than a horizontal engine and it also required less complex masonry foundations beneath the engine.
Telescopic cylinders must only be used in machinery as a device for providing force and travel. Side forces and moment loads must be minimized. Telescopic cylinders should not be used to stabilize a structural component. [4] Hydraulic telescopic cylinders are often limited to a maximum hydraulic pressure of 2000-3000 psi.
There are many compound systems and configurations, but there are two basic types, according to how HP and LP piston strokes are phased and hence whether the HP exhaust is able to pass directly from HP to LP (Woolf compounds) or whether pressure fluctuation necessitates an intermediate "buffer" space in the form of a steam chest or pipe known as a receiver (receiver compounds).
The cylinders can be said to work in "series" as opposed to the normal arrangement of a simple-expansion locomotive where they work in "parallel". In order to balance piston thrusts of a compound, the HP:LP cylinder volume ratio has to be carefully determined, usually by increasing the LP cylinder diameter and/or by lengthening the stroke.
Each pair of cylinders had a shared rotary valve between them, driven by a half-speed bevel gear. Like the Paget locomotive, the valves were of cast-iron and ran in a phosphor bronze sleeve within the cylinder. [21] As the valve and cylinders must operate in phase, [iv] the ports are duplicated. The advantage overall is a reduction in linear ...
This model incorporates many revisions to the basic Challenger design, including a larger and re-shaped vertical fin, fiberglass wing tips and redesigned landing gear. Qualifies as a US Light sport aircraft, 110 reported completed and flown by the fall of 2011. [1] [8] [11] Challenger II LSS XL-65 Two seats in tandem, 29 ft (8.8 m).