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Bristol Hercules..what sort of mad genius did it ? #4100250 05/18/16 03:16 PM
Joined: Dec 2002
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Shannow Offline OP
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Re: Bristol Hercules..what sort of mad genius did it ? [Re: Shannow] #4100264 05/18/16 03:38 PM
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andyd Offline
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And this is an aero engine? More budget than brains?


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Bristol Hercules..what sort of mad genius did it ? [Re: Shannow] #4100265 05/18/16 03:39 PM
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440Magnum Offline
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All that "complex" gearing really isn't all that complex... its just that there's a copy for every one of the 18 cylinders. The engine was amazingly reliable in wartime use, and also in transport aircraft in the 1950s. The amazing mad genius was figuring out the combination of reciprocation and rotation that makes a sleeve valve WORK in the first place. This is an animation of the smaller Bristol Hercules, but the valves work the same way on the Centaurus:

https://www.youtube.com/watch?v=_vrvep_YOio

A bit of trivia- Napier also used sleeve valves for the Sabre aircraft engine (an "H-24" configuration- basically stacked opposed 12's geared to a common output shaft). But they had terrible problems with the sleeve valves galling and seizing and the overall reliability of the Sabre was awful. Even since that era, the Bristol Centaurus has shown that it develops the same problem when air racers have tried to push more than its rated power through it, which is why the Wright 3350 is a popular re-fit for racing Sea Fury aircraft. The Wright is probably less reliable in stock form, but tolerates uprating better. Bristol tweaked everything just right for the planned rating on the Centaurus. And it sounds cool as heck.




'66 Dodge Polara & '69 Dodge Coronet R/T both 440/727
'08 Ram 1500 4.7/545RFE
'12 Challenger SRT8 392/6-speed
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Re: Bristol Hercules..what sort of mad genius did it ? [Re: 440Magnum] #4100285 05/18/16 03:54 PM
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440Magnum Offline
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Partial animation of a Napier Sabre... makes the Hercules/Centaurus look simple:



From a page with animations of lots of old engine designs:

http://www.enginehistory.org/CAD/index.php

Last edited by 440Magnum; 05/18/16 03:55 PM.

'66 Dodge Polara & '69 Dodge Coronet R/T both 440/727
'08 Ram 1500 4.7/545RFE
'12 Challenger SRT8 392/6-speed
'99 XJ 4x4 4.0/AX15, '14 WK2 4x4 3.6/8HP
Re: Bristol Hercules..what sort of mad genius did it ? [Re: 440Magnum] #4100333 05/18/16 04:33 PM
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GravelRoad Offline
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Was that back spec for 0w-20? grin


2016 Subaru Outback Premium 2.5. PP 5w30 oem filter
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Re: Bristol Hercules..what sort of mad genius did it ? [Re: Shannow] #4100409 05/18/16 06:14 PM
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gathermewool Offline
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Cool!


14 Forester XT Touring FA20DIT (Cobb Stage 1)
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Re: Bristol Hercules..what sort of mad genius did it ? [Re: Shannow] #4115626 06/05/16 08:10 AM
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cb4017 Offline
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A Sea Fury with the Bristol engine.



Then there's Dreadnought with an R-4360.



Cliff
USN Ret., FPD Ret.
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