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Post by turboNZ on May 14, 2006 20:50:02 GMT 12
Greetings,
Over at Flypast I asked a few of their helpful people if I could get some Griffon noises for a friend at my work who loves Spitfires.
I got sent a few but this one is truly amazing !!
It's from a Spitfire Mk XIV.
I'm working on making a downloadable link for it, so I can share.
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Post by turboNZ on May 14, 2006 20:55:20 GMT 12
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Post by Peter Lewis on May 14, 2006 22:33:37 GMT 12
Yes it works, and My God what a wonderful sound !! Listening to a single Spitfire/Mustang/Corsair, I often wonder what a whole squadron - or several squadrons - must have sounded like. There are a number of aircraft sound tracks available around the internet. I used several of these sound bites in making the Flash intro at the AHSNZ website. Go to ahsnz.tripod.com/ turn your speakers on and see if you can identify them (Warning - some are not what they seem). |
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Post by turboNZ on May 14, 2006 22:41:56 GMT 12
Hmmm,...I hear a Gipsy Major there once or twice, a Mustang Merlin,...and perhaps a JT8D 737 engine?
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Post by Dave Homewood on May 14, 2006 22:56:13 GMT 12
Wow, that Spitfire's got some real grunt eh!
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Post by turboNZ on May 14, 2006 23:05:45 GMT 12
Griffon's definitely sound grunty than the Merlins in my opinion.
Like an inline Centaurus sound !!
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Post by corsair67 on May 15, 2006 11:05:23 GMT 12
Yep, definitely sounds gruntier than a Merlin: very 'noice' sound.  |
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Post by amitch on May 15, 2006 15:50:10 GMT 12
The merlin had only 1600 hp and displaced 27 litres to the Griffons 2000hp and 36 litres, so you would expect it be sound "grunter" (all figures approx)
When the mk 14 was at Wanaka the noise was unreal!
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Post by turboNZ on May 15, 2006 16:12:38 GMT 12
For anyone here who understands the workings and insides of engines, this explains it quite well:-
"...The crankshaft, also like the Merlin was a 120 degree forged unit supported in seven cross bolted main bearings. However, the firing order was different from the Merlin. A 60 degree V-12 with a 120 crank and paired throws has a number of permutations on ideal firing order, no one being superior to another provided the intake system is "tuned" for the firing order chosen. However, the exhaust note will vary. This gave the Griffon its classic "Griffon Growl" exhaust sound, not as sweet as the Merlin but still impressive!! Different valve timing contributed to the difference in exhaust note. The Griffon had a relatively modest 28 degrees of overlap and 248 degrees of cam duration compared to the Merlin's more radical 43 degrees of overlap and 263 degrees of duration..."
Taken from :http://users.bigpond.net.au/Shackleton/rolls.html
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Post by Bruce on May 15, 2006 16:42:34 GMT 12
When I was working at Aeromotive I was tasked was inhibiting the Griffon off the former AFC Mk 14, prior to it being sold to Paul Page. (the wreck was stored in a shed at PAC for a few months). This involved filling the entire engine up with a mixture of oil and rust inhibiter, via the only suitable fitting hole - the hollow Camshaft bevel gears (Hole diameter was approx 1/2") Obviously the total internal volume was way over 36 litres - eventually it took nearly 200 litres, all poured very slowly through the bevel gears - it took 3 days to fill! we then drained most of that oil back out again, as the additional weight would have put too much strain on the engine mounts, which we had rigged up to a temporary stand.
Basically I love all big piston engines, although I miss the Centaurus on the Sea Fury the most. (that is mainly because I had a lot to do with that machine). As far as big Vees go though, I wonder what the RR Crecy (the ultimate RR Vee engine) would have sounded like - intercooled and with sleeve valves!
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Post by turboNZ on May 15, 2006 16:56:21 GMT 12
That was the V12 2-stroke one wasn't it.
I read once that it had 2500hp at it's early stage of development !!
Could have been a beast alright.
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Post by mumbles on May 15, 2006 17:09:39 GMT 12
Yeeha, turn it up!
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Post by Bruce on May 15, 2006 22:42:32 GMT 12
If I recall the Crecy had sleeve valves, so unless it did something a bit different it wouldnt have been 2 stroke I guess. I dont know much about it, other than it was earmarked for later Hawker Tempests etc, and possibly the Martin Baker MB-5, but only a handful were ever built, and only one survives - at Derby I think. It was a bit flatter Vee than the Merlin and Griffon, with an intercooler between the banks. I think it also had power recovery turbines, like the big Wright Turbo Compound radials. It turned out 2500 - 3000 hp in tests, but development switched to Jet engines and nothing much came of it. Unfortunately there is a shortage of info on it - does anyone have any gen on it, rather than my sometimes inaccurate recollection of magazine articles I've read?
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Post by Bruce on May 15, 2006 22:49:15 GMT 12
If in doubt - do a google! see: en.wikipedia.org/wiki/Rolls-Royce_CrecyIt was a 2 stroke and yes they certainly did something a bit different with its method of operation! Learn something new every day..... |
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Post by Simonjg on May 17, 2006 2:15:13 GMT 12
yeh baby!!
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Post by turboNZ on May 18, 2006 15:59:24 GMT 12
It's been 4 days since I posted that lovely sound. It still give me the goose-bumps when I hear it again !! Doesn't get much better.  |
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