Happy-flier
Topic Author
Posts: 287
Joined: Sat Dec 25, 1999 4:41 pm

RR Conway 508 Vs. 550: How Similar Are They?

Tue Jun 14, 2005 10:17 am

Now here's a really obscure techie question.

How "similar" are the Rolls Royce Conway RCo.12 Mk 508's that powered the 707-420 to the RCo.43 Mk 550's of the Super VC-10? In other words, if you listen to a VC-10 operating today, is that sound likely to be indicative of the sound produced by the Mk 508 variant that powered the 707-420?

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Photo © Keith Bradley


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Photo © Roland Cartarius

I realize that the sounds may be nothing at all alike, since the Mk 508's produced something like 17,500 lbs of thrust while the Mk 550's of the VC-10 put out well over 20,000 lbs. Yet -- and here's my tenuous linking of the two -- they are both Conways.

How I would love to know!

(BTW, a complete listing of the RCo. variants can be seen here.)

Cheers,
Happy-flier
May the wind be always at your back . . . except during takeoff & landing.
 
whitehatter
Posts: 5180
Joined: Sat Jun 12, 2004 6:52 am

RE: RR Conway 508 Vs. 550: How Similar Are They?

Tue Jun 14, 2005 7:21 pm

Quoting Happy-flier (Thread starter):

How "similar" are the Rolls Royce Conway RCo.12 Mk 508's that powered the 707-420 to the RCo.43 Mk 550's of the Super VC-10? In other words, if you listen to a VC-10 operating today, is that sound likely to be indicative of the sound produced by the Mk 508 variant that powered the 707-420?

VERY different!

The Conways on the VC-10 produce a strange 'warbling' sound which is totally unique to that aircraft, due to the sound output of the front stages creating interference. The 707 and DC-8 installations did not produce this effect presumably because the engines are much further apart.

Similarly the Conways on the VC-10 did not have the hairdryer attachment at the rear which the underwing installation on the 707-420 had, so noise levels when stood at the rear of the aircraft were on a par with a turbojet powered 707.

However it is when running at idle or taxiing where the distinct difference shows up. There is no other aircraft which makes a sound like the VC-10 does.
Lead me not into temptation, I can find my own way there...
 
Happy-flier
Topic Author
Posts: 287
Joined: Sat Dec 25, 1999 4:41 pm

RE: RR Conway 508 Vs. 550: How Similar Are They?

Wed Jun 15, 2005 12:57 am

Thanks WhiteHatter.

I WISH I could find a video/sound-recording of the VC-10 someplace. I have never heard one ever before - even though I saw a VC-10 at the Hamilton Air Show in 1996 and got to walk under it and photograph it from various angles.
May the wind be always at your back . . . except during takeoff & landing.
 
iRISH251
Posts: 652
Joined: Fri Nov 26, 2004 3:56 am

RE: RR Conway 508 Vs. 550: How Similar Are They?

Wed Jun 15, 2005 4:42 am

There is an Avion Video DVD on the VC10 which I can heartily recommend. Here's a link to a review. It does include some material where the sound is well-captured.

http://www.vc10.net/Misc/VC10Videoreview.html
 
GDB
Posts: 12785
Joined: Wed May 23, 2001 6:25 pm

RE: RR Conway 508 Vs. 550: How Similar Are They?

Sat Jun 18, 2005 11:15 pm

I've got that DVD, very highly recommended.
Remember to crank the sound up, and if you have it, surround sound!
 
David L
Posts: 8553
Joined: Tue May 18, 1999 2:26 am

RE: RR Conway 508 Vs. 550: How Similar Are They?

Sun Jun 19, 2005 2:33 am

Irish251, GDB:

Thanks so much for mentioning that DVD. I've just been to take a look... and bought it... along with several others which caught my eye... 97 quid... cheers.  Sad

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