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nver mind
Roots s/c's were used sparingly for aircraft engines during WW1 but they are bulky and not as suited as centifugal s/c's.
In WW2, the German HZ-Anlage arrangement used a central, fuselage-located Roots-type s/c to feed two wing mounted engines with compressed air for very high altitude work.
The first sentence in the caption next to the photo says, "This dual flow and two-stage main supercharger..... etc"
Has anyone got a cross-section of this big Roots s/c because I can't see how it can produce TWO stages of compression!
Below is a drawing of a German Argus As 10 V-8, aircooled engine fitted with a Roots-type supercharger.
Air to the engine can be obtained from below at atmospheric pressure or, with the valve closed, from the supercharger.
Some info from the patent record regarding the origin of the Roots Blower is given below.
The upper drawing is from the patent granted to Mr Philander H. Roots of Connersville, Indiana, USA in 1860 and it shows, almost completely, the Roots blower as we know it today.
P. H. Roots and his brother, Francis M. Roots went on to establish a manufacturing facility for this type of pump.
However, P. H. Roots did not invent the so called Roots blower. There are several other patents dated earlier which show the same kind of pump eg the lower drawing from a patent by Oliver Palmer of Buffalo, NY granted three years earlier in 1857.
(Cough****Cough) boy this is an old thread!
(Cough****Cough) Some of us are old geezers. Our memory ain't so good.
What were we talking about?
Nap-time for me.