Simon Thomas
Senior Airman
A paper from 1951 comparing the flow behaviour of a Bristol Hercules XVI and a Wright Cyclone.
Flow Test of a Bristol Sleeve-valve engine cylinder
- Thread starter Simon Thomas
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MiTasol
Major
Very interesting however I do challenge his statement on page 10 that
because it ignores the fact that the 1940 model Hercules which he analysed was, like the R-1820, developed long after that.
With the 1940 engines he evaluated the Herc had 40% more power.
Late model R-1820-82WA engines developed 1,525 hp (1,137 kW) and many late model Hercules (700 srs) engines developed 2,080 hp (1,550 kW) - or 36% more power.
Given these Hercs were civil engines reliability and TBO were far more important selling points than for the R-1820-82 which was a military engine.
because it ignores the fact that the 1940 model Hercules which he analysed was, like the R-1820, developed long after that.
With the 1940 engines he evaluated the Herc had 40% more power.
Late model R-1820-82WA engines developed 1,525 hp (1,137 kW) and many late model Hercules (700 srs) engines developed 2,080 hp (1,550 kW) - or 36% more power.
Given these Hercs were civil engines reliability and TBO were far more important selling points than for the R-1820-82 which was a military engine.
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