harold schneider
Airman
- 23
- Sep 2, 2009
This is a short overhaul of the Rolls single-Stage Blower.
Rolls Royce Single Stage Supercharger
- Thread starter harold schneider
- Start date
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jerryw
Airman 1st Class
Speaking of Rolls-Royce Merlin single-stage superchargers, above is a copy of a drawing from "Allied Aircraft Piston Engines of WWII" by Graham White.
Can you spot the error??
jerryw
Airman 1st Class
Wow! Almost 250 views of this post and still no one can spot the BLOOPER!
Where are the experts???
Where are the experts???
PWR4360-59B
Senior Airman
- 379
- May 27, 2008
A piston ring type oil seal, is just a nomenclature deal. Now they just call it a seal ring. Automatic transmissions have lots of them, as well as hook ring seals.
Its not an overhaul, its a sectional drawing. Thats the blooper.
Its not an overhaul, its a sectional drawing. Thats the blooper.
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jerryw
Airman 1st Class
THE ANSWER!!!
The blooper is that the drawing and the caption DO NOT MATCH.
The caption says that this is a drawing of a single-stage, two-speed supercharger for a Merlin XX
In fact, the drawing is of a single-stage, one-speed supercharger for a Merlin Mk II or III
The Merlin 2-speed supercharger is much more complicated than the 1-speed. There are selector forks running through the mechanism and there are two pinions on the impeller shaft, one for high speed and one for low.
The blooper is that the drawing and the caption DO NOT MATCH.
The caption says that this is a drawing of a single-stage, two-speed supercharger for a Merlin XX
In fact, the drawing is of a single-stage, one-speed supercharger for a Merlin Mk II or III
The Merlin 2-speed supercharger is much more complicated than the 1-speed. There are selector forks running through the mechanism and there are two pinions on the impeller shaft, one for high speed and one for low.
PWR4360-59B
Senior Airman
- 379
- May 27, 2008
No it is not an "O" ring seal. It is a piston ring type seal ring. So the nomenclature is pretty correct. An O ring is a rubberish type ring, a seal ring is metalish.
dairwin
Airman
One can spot the occasional errors in the manuals. Some of the foreign language translations can be shocking.
The diagram is applicable to most single speed Merlins (one speed?), including my Merlin VIII.
MIflyer
1st Lieutenant
I have found that in WWII articles and popular drawings it is common for them to say that a supercharger is "two stage" in in reality it is simply two speed.
dairwin
Airman
For the Merlin, there were three general types described as; single speed, two speed, and two stage.
The single speed engines used a single supercharger stage with one drive ratio. The two speed engines used a single supercharger stage but had two ratios driving it; a moderate and full speed (MS for low altitude and FS for high altitude). The most powerful Merlins had two supercharger stages, with two ratios driving.
The single speed engines used a single supercharger stage with one drive ratio. The two speed engines used a single supercharger stage but had two ratios driving it; a moderate and full speed (MS for low altitude and FS for high altitude). The most powerful Merlins had two supercharger stages, with two ratios driving.
