View Full Version : Vineys Poinless Poll: Tunnels
Which sound better when riding through and why?
the dont care option is where exactly...?
Alpinestarhero
09-03-07, 10:49 AM
Round; sound reverberates better :D Went through a square tunnel y'day, didnt make as much beautiful V-twin "vrooom!" as a curvy tunnel (curveys again far better!)
Matt
rictus01
09-03-07, 10:56 AM
Lewes tunnel, not only round but corrugated to bounce all the sound back:D
Cheers Mark.
Ceri JC
09-03-07, 11:22 AM
I don't know the reason for the acoustics of it, but I find round tunnels "boom" more, whereas square ones sort of rasp (almost as if you're going over gravel). Both sounds are nice, but I prefer round ones (both sonically and aesthetically).
Never come across a square one - why would anyone try to dig a square tunnel? :scratch:
gettin2dizzy
09-03-07, 11:43 AM
round ones are smaller, so better :) would love to try one of the huge ones in norway
The side tunnels into and out of Heathrow are quite nice. Made for cars and small vans so are quite small.....:)
Never come across a square one - why would anyone try to dig a square tunnel? :scratch:Long tunnels under railways are usualy square
Lewes tunnel, not only round but corrugated to bounce all the sound back:D
Cheers Mark.
Got it in one. Best tunnel I've ever been through. Vineys end of season rideout 2005 (I think). 20 SVs all clutched in and bouncing off the limiter. Coolgirls bike spitting flames at me.:D
round ones are smaller, so better :) would love to try one of the huge ones in norway
Surely they'd have a structural weak point in the middle of the roof?
The engineer must know that!
(sorry, someone pass me my coat!)
gettin2dizzy
09-03-07, 12:44 PM
:P hehe. square ones are structurally much worse! Round ones transmit the forces much better. I'd quite like to drive down one of the pedestrian sized tunnels though, could be star shaped for all i care :D
[quote=Baph;1134207]Surely they'd have a structural weak point in the middle of the roof?
quote]
:scratch: why?
Ignore me, mis-quoted. I meant square ones have a structural weak point.
I'm ill*, I have an excuse, leave me alone :smt022
*mentally
Ignore me, mis-quoted. I meant square ones have a structural weak point.
good! was wondering if i should have stayed awake during more lectures at uni ;)
I'd rather ride though round... its stronger.
gettin2dizzy
09-03-07, 01:08 PM
good! was wondering if i should have stayed awake during more lectures at uni ;)
Yeah, it is a little difficult. I'm stuck in the rolls royce lab lab all day now. I bet you can imagine how much fun that is! Surely you miss all those lovely structures/statics/dynamic lectures?!
Yeah, it is a little difficult. I'm stuck in the rolls royce lab lab all day now. I bet you can imagine how much fun that is! Surely you miss all those lovely structures/statics/dynamic lectures?!
it didn't mind doing labs, at least you get to do/watch something. but the lectures were soooooooo boring. do you share lecturers with the mech eng dept?
Tiger 55
09-03-07, 01:24 PM
why would anyone try to dig a square tunnel? :scratch:
Flight Lieutenant Danny Velinski dug 17 tunnels with his bare hands, all of them square and he knows more than you. And he was claustraphobic.
Did he escape on a rowing boat in the end or was that James Coburn?
gettin2dizzy
09-03-07, 01:33 PM
it didn't mind doing labs, at least you get to do/watch something. but the lectures were soooooooo boring. do you share lecturers with the mech eng dept?
They're pretty much identical. We share quite a few subjects, otherwise they change 'car' to 'plane'. The merger this year has screwed things up big time. We're doing an entirely new course put together from lots of bits of others, makes it a nightmare trying to work out what we should be learning. We also do really complicated subjects having not done any of the groundwork we should have done. It gets really petty the way the two universities bicker at each other.
Fizzy Fish
09-03-07, 01:36 PM
Can't beat Rotherhithe Tunnel with a nice V-Twin. It's a proper round tunnel as well - none of your archway rubbish!
They're pretty much identical. We share quite a few subjects, otherwise they change 'car' to 'plane'. The merger this year has screwed things up big time. We're doing an entirely new course put together from lots of bits of others, makes it a nightmare trying to work out what we should be learning. We also do really complicated subjects having not done any of the groundwork we should have done. It gets really petty the way the two universities bicker at each other.
sounds poo. i have been wondering how the merger has been going.
the last year i was at umist man uni and umist seemed to be getting more separate, they had previously shared computer systems so we could all share computer rooms and libraries etc but i think umist got annoyed with man uni and decided to do their own network and when i graduated from umist you could pick whether to have a umist or man uni degree (i think umist had only just got permission or whatever to award their own degrees), i'm one of the few people with a degree certificate that says umist on it.
do you have any lectures/labs with dr methven? i didn't dare sleep through any of his lectures!!
Flight Lieutenant Danny Velinski dug 17 tunnels with his bare hands, all of them square and he knows more than you. And he was claustraphobic.
Did he escape on a rowing boat in the end or was that James Coburn?
undoubtedly - I asked the question cos I didn't know the answer.
Yes he did escape in a boat and was one of the few that made it.
Good spot though cos in a way it answered the question. In his case the tunnel was dug to fit the supports they had available i.e. timber sections nicked from the beds.
Rather him than me...
Filipe M.
09-03-07, 01:56 PM
Rounds tunnels reflect sound / noise to a focal point depending on the radius and complexity of the curvature, increasing the G (strength) factor at that point.
Square tunnels create parallel reflections between ground and ceiling.
Corrugated ceilings create sound diffusion, possibly increasing reverberation time and the G factor.
*pedant mode off*
Round corrugated for me too. :D
chazzyb
09-03-07, 03:01 PM
Never come across a square one - why would anyone try to dig a square tunnel? :scratch:
Cut'n'cover tunnels will be square section.:study:
tinpants
09-03-07, 03:12 PM
undoubtedly - I asked the question cos I didn't know the answer.
Yes he did escape in a boat and was one of the few that made it.
Good spot though cos in a way it answered the question. In his case the tunnel was dug to fit the supports they had available i.e. timber sections nicked from the beds.
Rather him than me...
In the film he was played by Charles Bronson and, yes, he did escape in a rowing boat. I've just finished reading the factual account of the escape written by Paul Brickhill who was a member of the "X" organisation in Stalag Luft 13. In reality Flt.Lt. Velinski was one of the 50 murdered on the personal orders of Hitler. Incidentally, of the 79 that managed to get out only 3 managed to get back to England. Most of them were caught, interrogated and shot.
Getting back to the point, I prefer riding thru round tunnels as the acoustics are better. Theres a fairly long tunnel just outside Rouen that is fantastic to ride thru when theres a lot of bikes.
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