A.P. 129 RAF Flying Training Manual, Part I - Landplanes
 

Engine limitations, boost control and cut-out/override.

Continued.

Thanks 41Sqn; attached is another explanation of boost types used by RAF engines from R A Beaumont A.F.R.Ae.S "Aeronautical Engineering: A Practical Guide for Everyone Connected With the Aero Industry"

(3) Override Boost - For the greatest possible power output for take-off or emergency, an increase in pressure above the normal take-off boost is permitted on some engines. This condition is used in conjunction with a special fuel. (p. 106)

The wording is similar to A.P.129, apart from noting that override boost was used in conjunction with a special fuel.

Wow, great stuff 41Sqn_Banks; thanks for sharing!

As an aside if I may, what equipment and set up are you using enabling you to obtain such beautiful images of these old manuals? Secondly, where do you get this stuff, lol! All I've been able to obtain of such material is monochrome/microfilmed copies from the archives...

Thanks for sharing Banks and NZTyphoon

It also notes that boost pressure is above what can be normally achieved with the take off boost override.

We know from the certificate altitude bench test that +10.5lbs was achieved with boost override on 87 Octane fuel.

The achievement of +12lbs is the rating for 100 Octane.

The Germans the same basic principle for in C3 Einspritzung. A very rich mixture to suppress detonation at very high manifold pressures.

Holy Christ, guys. Put this trash in the 100 octane thread where it belongs.

Very nice, thanks for sharing!

You can buy original manuals at second hand bookshops. For scanning I use a consumer book scanner (in my case Plustek OpticBook 3600 Plus)

No ones forcing you to read rare original documents that someone's very generously posted. Why don't you have a nice day.

@ 41Sqn_Banks, thank you very much for sharing, really interesting:cool: