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The Roots supercharger dates back to the 1860s, and this is the basis for the original Wade supercharger, but with patented modifications incorporated. The first patent of Costin and Densham deals with ways to achieve compression within the Roots-style blower. [ 2 ]
In 1875, Roots exhibited a blower at the Saint Petersburg Exhibition; Thwaites and Carbutt exhibited a Roots principle "air blowing machine" for mine ventilation in the same exhibition. [ 6 ] In 1885, Edgar Dwight Johnston joined the firm of 30 people; he became vice president in 1889 and president in 1898, remaining so until at least 1931.
An Eaton M62 Roots-type supercharger is visible at the front of this Ecotec LSJ engine in a 2006 Saturn Ion Red Line.. The Roots-type blower is simple and widely used. It can be more effective than alternative superchargers at developing positive intake manifold pressure (i.e., above atmospheric pressure) at low engine speeds, making it a popular choice for passenger automobile applications.
In the 1960s Godfrey continued to make the Roots-type cabin air compressors (a development of the original Marshall), but also a screw-type compressor. Surplus stores of these cabin superchargers (Marshall cabin blowers) were repurposed after the war and used for tuning cars (mainly for racing, hill-climbing, etc.).
Howden is part of the US engineering group Colfax Corporation. The purchase price was 195 million euros. [2] Along with the Palatine factory there are also branches in Springfield, Missouri, Helsingor, Denmark and Mornago, Italy. [2] Howden Turbo GmbH, headquartered in Frankenthal, was founded on October 3, 2017, through the acquisition of Howden.
The rotor form is cycloidal, and in this drawing is drawn accurately. In fact, it is part epicycloidal and part hypocycloidal, and in both cases the smaller generating circle is 1/4 the diameter of the circle it rolls around. Roots blowers find uses in superchargers and gas pumps which need a high volume at a low differential pressure.
Howden was born in Prestonpans, East Lothian, in 1832, [1] the son of James Howden and his wife, Catherine Cowden, [2] [3] and was educated at the local parish school. [4] His first marriage was to Helen Burgess Adams, with whom he had one daughter, Catherine Spence Howden (1873–1925), [5] and his second to Allison Moffat Hay, with whom he had two sons, James Howden (1883–1908) and William ...
During 1983, Nigel McCorkell and Ken Coates, together with 3i Group, took control of Meggitt via a management buy-in. [6] The new management team soon embarked on a series of acquisitions, aimed at increasing the business' geographical diversity to become an international engineering company; it focused on speciality sectors within fields such as aerospace, controls, electronics and energy. [6]