Pardon me, binged the thread.
first, I want to say Holy Crap this book is way cheaper than it has any right to be. I was fully expecting something like the books from Headstamp Publishing, which tend to run $75-100 US.
Now, on to comments.
"Manifold Pressure" is always absolute, "boost pressure" is almost always gauge.
They're terms of art in the aircraft world.
What the?!? Okay, I want more details on this!
That's honestly a really useful note, but I don't want to deal with heavy math anymore. I should probably get back in and re-do calculus at some point (did not do enough homework and so did just well enough to pass, but I was a business major so Calc was the last math class I had to take)
And given that useful guideline I can see why the Germans did the math that way.
Okay, that's weird to say "boost pressure" and then use absolute units. Normally, "boost" is gauge pressure.
And yes, a 7psi boost really is all they were running back then. War Emergency Power for a Merlin is 61"Hg, ~15psi boost; normal max is ~55"Hg, ~12.5psi boost.
Some of that comes down to prop versus jet. I don't have the math to explain why, but props always accelerate faster than jets. Even when the engine in question is a turboprop.
The hybrid engines like the 3350 Turbocompounds came out late in the war or missed it entirely, and did terrible things to engine reliability. The PRTs on the 3350s were sarcastically called "Parts Recovery Turbines" due to the low TBO and extra maintenance they caused.
I think a "director's cut" with all the "nearly" engines would be an awesome electronic copy, it's probably not worth the effort to publish it on paper.
Racers are gonna race, last I heard was an airport in Wyoming was willing to consider hosting. I want to say Casper? The town hosts a rodeo, so they have a decent number of hotel rooms available for the racers and audience. And the Casper airport has a lack of whiny neighbors trying to get the entire airport shut down, which was the problem at Reno.
That is a very weird idea... basically using the engine as a not-quite-motorjet?
