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#1691
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Having found a 1942 (?) copy of R A Beaumont Aeronautical Engineering: A Practical Guide for Everyone Connected with the Aero Industry (modern reprint http://www.pitstop.net.au/view/aviat...uery/plu/23199) it's interesting to read what he says about the "four degrees (types) of boost" used by British aero engines:
(1) Take-off Boost - ...an additional amount of induction-pipe pressure....accompanied by an extra richening of the mixture which prevents an unstable combustion termed detonation...(p. 105) (2) The Rated Boost - often known as maximum climbing boost....boost pressure is reduced to a value which permits the engine to run continuously at that particular power output...(p. 105-106) (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) (4) Maximum Cruising Boost.... Thus it is specifically stated that override or emergency boost was used only in conjunction with a fuel that permitted the higher boost rating. Last edited by NZtyphoon; 05-17-2012 at 10:36 AM. |
#1692
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Acctualy the SIM should be: SUPERMARINE SPITFIRE: CLIFFS OF DOVER.
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#1693
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It definately was not good but it was possible. Pulling the tit and overboosting the engine is not proof of the use of 100 Octane fuel. |
#1694
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#1695
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#1696
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![]() The above story clearly pertains to an engine that was already modded for 12lb boost (and thus using 100 octane) and the match stick mod permit boost up to 18lb, and it has already been established that Hurricanes in France were using 100 octane fuel by May 1940. Maximum boost with 87 octane was 7lb: http://www.spitfireperformance.com/spit2pnfs3.jpg Last edited by Seadog; 05-17-2012 at 05:22 PM. |
#1697
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__________________
klem 56 Squadron RAF "Firebirds" http://firebirds.2ndtaf.org.uk/ ASUS Sabertooth X58 /i7 950 @ 4GHz / 6Gb DDR3 1600 CAS8 / EVGA GTX570 GPU 1.28Gb superclocked / Crucial 128Gb SSD SATA III 6Gb/s, 355Mb-215Mb Read-Write / 850W PSU Windows 7 64 bit Home Premium / Samsung 22" 226BW @ 1680 x 1050 / TrackIR4 with TrackIR5 software / Saitek X52 Pro & Rudders |
#1698
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Did the Russians ever get any Spitfire Mk1s and/or MkIIs? They did get Mk Vs and MkIXs.
IvanK supplied most, if not all, of the data for the DEVS. Great posts Seadog. |
#1699
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Wrong - there are two engine tests, one on 87 Octane and one on 100 which both ran up to 10.5 lbs boost - there was no boost override used which, as Beaumont observed, required special fuel - ie: 100 Octane - to achieve. Later Merlin engines, such as the 45 series, were capable of boost override of +18 lbs but needed, and were designed to use, 100 Octane to do so. Later still +25 lbs boost could only be achieved using 150 Octane.
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#1700
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It does not, the General Operating Notes clearly say he can use it. Last edited by Crumpp; 05-17-2012 at 07:39 PM. |
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