loggyboy
|
| posted on 1/3/16 at 10:12 AM |
|
|
How long till we get to 300 Mph?
http://www.thedrive.com/article/2378/the-2017-bugatti-chiron-might-break-your-brain?xid=the-drive_socialflow_facebook
I remember being obsessed with the F40 when it broke 200, then the F1 reaching 240 a few years later - then things went quiet. It was like the
manufacturers felt road cars had peaked and nothing would go that much faster. Then the Veryon came along blew every rule book and opened it back up
again.
It appears the Chiron may have a silly name, but is being road limited to 260ish, but with a lot more HP I cant see it not breaking the ~270 record
the supersport currently has.
P..s im ignoring the Hennessey Venom as the Americans seem to like to make their own rules up for how they claim records.
Mistral Motorsport
|
|
|
|
|
Ugg10
|
| posted on 1/3/16 at 11:08 AM |
|
|
Given the relationship for drag is -
Drag force = 0.5 x drag coefficient (shape) x air density x frontal area x velocity squared
simplistically to overcome the drag (assuming bearing and tyre drag is negligible) you need the engine to do work -
If you double the speed you need 4x the power, so small increments of speed can mean big increases of power. I would expect that if the Veyron needs
1000hp to get to 250mph for a similar car in a similar environment then it will need 1750hp+ to get to 300mph but probably nearer 2000hp in reality.
---------------------------------------------------------------
1968 Ford Anglia 105e, 1.7 Zetec SE, Mk2 Escort Workd Cup front end, 5 link rear
Build Blog - http://Anglia1968.weebly.com
|
|
|
jambojeef
|
| posted on 1/3/16 at 11:39 AM |
|
|
Aero drag (Cd x frontal area) is a critical factor as stated above -
As an illustration Bill Warner (RIP) was clocked at over 300mph on a sit-on but streamlined turboed busa a few years with around 1000bhp and malcolm
campbell took the world land speed record over 300mph with 2300bhp with bluebird in 1935.
Obviously its a pretty rough comparison but numbers tell some of the story at least
[Edited on 1/3/16 by jambojeef]
|
|
|
liam.mccaffrey
|
| posted on 1/3/16 at 12:24 PM |
|
|
Aside from the technical discussion (which I love by the way) I think the Chiron is a much much nicer looking car than the Veyron and pretty much any
of the other "hypercars"
Check out the 7 min ish walk around review on the motor trend youtube channel.
Build Blog
Build Photo Album
|
|
|
coozer
|
| posted on 1/3/16 at 12:37 PM |
|
|
What we need is the kind of development that goes into war... In 1940 the spitfire was a slow dog but by the end was a speed machine. Tons of
development went into the merlin to keep it competitive. Problem is who wants to spend that amount of money to get to 300 on the road???
We have abandoned super fast mach 2 air travel for more seats but trains are getting faster and faster.
Trouble is to get a car up to 300 its using the same technology as the spitfire! All the other speed machines use jets or electricity!
1972 V8 Jago
1980 Z750
|
|
|
prawnabie
|
| posted on 1/3/16 at 12:54 PM |
|
|
Devel sixteen claims 350mph from a 5000hp v16 engine 
Of course you would need to spend £££££££££ on R+D for a set of tyres to get you there lol
[Edited on 1/3/16 by prawnabie]
|
|
|
jeffw
|
| posted on 1/3/16 at 03:36 PM |
|
|
Should this not be how long before we get to 1000MPH? 300 was done some time ago.
http://www.bloodhoundssc.com/project/car
|
|
|
dilley
|
| posted on 1/3/16 at 03:38 PM |
|
|
I think we should do a group build 7 that can achieve this.....
|
|
|
loggyboy
|
| posted on 1/3/16 at 04:22 PM |
|
|
a 7s Cd is about 0.7, would probably need 10000BHP to get a 7 in to the 300mph zone.
Mistral Motorsport
|
|
|
David Jenkins
|
| posted on 1/3/16 at 04:32 PM |
|
|
How long before we get to 300mph? Who cares? You could never drive that Bugatti to the max in the UK. You'd be too terrified anyway, in case
you damage it (or yourself).
There was something about it on the TV - if you drove the Veyron at maximum speed you would wear out the tyres in a ludicrously short distance (very
few miles) but that didn't matter, because you'd run out of petrol way sooner, even if you started with a full tank.
|
|
|
loggyboy
|
| posted on 1/3/16 at 04:35 PM |
|
|
quote:
Originally posted by David Jenkins
Who cares?
I do.
Do you still live in a cave? no so dont assume what you think is 'the norm' now will always be the norm.
Mistral Motorsport
|
|
|
David Jenkins
|
| posted on 1/3/16 at 05:18 PM |
|
|
Well, the average mph on UK roads is getting slower and slower...
(and I'm very fond of my cave! )
|
|
|
loggyboy
|
| posted on 1/3/16 at 05:33 PM |
|
|
quote:
Originally posted by David Jenkins
Well, the average mph on UK roads is getting slower and slower...
not when i'm on them!
Mistral Motorsport
|
|
|
David Jenkins
|
| posted on 1/3/16 at 05:39 PM |
|
|
The thing is (IMHO) that a Ferarri is a worthy car because it's exciting and rewarding to drive at almost any speed apart from city traffic. A
Maserati is perfect for steaming down an autostrada/autobahn at high speed in relaxed style with a reasonable expectation that you won't get
spat into the scenery.
Those Bugattis are just a substitute for a small willy... usually bought by people who want to show off that they've got more money than
sense.
[Edited on 1/3/16 by David Jenkins]
|
|
|
jeffw
|
| posted on 1/3/16 at 06:12 PM |
|
|
Damn....best get my deposit back then....
|
|
|
morcus
|
| posted on 1/3/16 at 06:22 PM |
|
|
I got the impression from the top gear piece on the last Bentley that the limiting factor for a production road car top speed was having a place to do
it.
In a White Room, With Black Curtains, By the Station.
|
|
|
designer
|
| posted on 1/3/16 at 07:18 PM |
|
|
Have any of these cars done the speed they claim to do? or it it all theoretical, or in a wind tunnel!
|
|
|
David Jenkins
|
| posted on 1/3/16 at 07:50 PM |
|
|
Some TV presenter did it on a test track - James May perhaps - whoever it was, it was him that mentioned the tyre wear and fuel consumption.
|
|
|
scudderfish
|
| posted on 1/3/16 at 07:53 PM |
|
|
A remember reading something that said that if a Veyron going flat out passed a stationary top fuel dragster, the dragster would still win over 1/4
mile.
|
|
|
David Jenkins
|
| posted on 1/3/16 at 08:05 PM |
|
|
quote:
Originally posted by scudderfish
A remember reading something that said that if a Veyron going flat out passed a stationary top fuel dragster, the dragster would still win over 1/4
mile.
I'd heard the same story, but with an F1 car doing 200mph past the drag start line...
[Edited on 1/3/16 by David Jenkins]
|
|
|
loggyboy
|
| posted on 1/3/16 at 08:38 PM |
|
|
quote:
Originally posted by designer
Have any of these cars done the speed they claim to do? or it it all theoretical, or in a wind tunnel!
Veyron has bonafide Guinness world record of 267.8
James may did 259 but the test driver beat that later on.
https://youtu.be/LSFX9vrwJf8
Mistral Motorsport
|
|
|
gremlin1234
|
| posted on 1/3/16 at 09:29 PM |
|
|
I came back from LeMans one year, and we passed a veyron twice. (we had stopped for a break.)
conclusion:
a 10 yr old polo is at least as fast as a veyron
|
|
|
Sam_68
|
| posted on 1/3/16 at 09:38 PM |
|
|
quote:
Originally posted by gremlin1234
I came back from LeMans one year, and we passed a veyron twice. (we had stopped for a break.)
conclusion:
a 10 yr old polo is at least as fast as a veyron
Some really quite mundane machinery, driven by amateurs, easily outpaced the Veryon when I've seen it demonstrated up Prescott Hillclimb in the
hands of its F1 test driver.
|
|
|
paulc
|
| posted on 1/3/16 at 10:52 PM |
|
|
quote:
Originally posted by Ugg10
Given the relationship for drag is -
Drag force = 0.5 x drag coefficient (shape) x air density x frontal area x velocity squared
simplistically to overcome the drag (assuming bearing and tyre drag is negligible) you need the engine to do work -
If you double the speed you need 4x the power, so small increments of speed can mean big increases of power. I would expect that if the Veyron needs
1000hp to get to 250mph for a similar car in a similar environment then it will need 1750hp+ to get to 300mph but probably nearer 2000hp in reality.
Its worse than this:
Work done is Force x Distance moved.
Power is work done per second.
you need to multiply drag by speed again to get to power.
To go twice as fast you need 8 times the power.
|
|
|
ste
|
| posted on 2/3/16 at 05:59 AM |
|
|
decent article here
http://www.bbc.com/autos/story/20150320-how-do-we-get-to-300mph
|
|
|
