Jeff Spitzer wrote:

Bill Freeman wrote:

A key point that Jeff made in his sketches that I want to
point out so we don't gloss over it is - With a well done
external diffuser you can recover essentially FULL pitot
pressure.  I can't be sure I'm reading his note properly, but
I think he wrote that the upper limit for internal diffusion
is about 20% recovery (could be 80%, tho, can't tell).  If
this is correct, then the ext diffusion looks a LOT more
efficient.

The upper limit is about 80%.  Sorry for the handwriting.  I spend too much
time on this newsletter as it is :)

Jeff Spitzer

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