"The Performance of a Supercharged Aero Engine" - Discrepancy b/n Fig 32 & Table III.

[Simon Thomas]

I have been working through Hooker et al's "The Performance of a Supercharged Aero Engine", and I was able to calculate performance results that matched the paper, right until Table III.
I found the W.SQRT(Ti)/P figures in the table are all 10 less than that shown on Fig 32. It appears that the x-axis needs to be slid over by 10.
All the other figures could be calculated to match the table, within a few %.
Using the figures from the table results in the performance matching Fig 33, which is the performance curve of the Merlin XX in FS.
Has anyone else come across this?

 

[Daggerr]

There are multiple inaccuracies (simplifications, wrong assumptions, mistakes) in that booklet.

However it still provides a very good guide of how the many variables impact the supercharger and engine performance.
It can be used to estimate the impact of a change in a variable, but do not expect very accurate results.