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Forbin
S3 licensed
Quote from Racer Y :I started a sketch on a fantasy bike I thought would be used for NASCAR style oval racing. Well you know that saying,"If you've thought it up, someone else has built it"?
Yeah...
http://www.youtube.com/watch?a ... cthIoFg&v=ANwiN2jAa3s

only this guy uses a dodge viper motor. LOL I don't like the rider's position on his bike either. It's a little too high

https://www.google.com/search? ... amp;biw=1920&bih=1099

https://www.google.com/search? ... amp;biw=1920&bih=1099
Forbin
S3 licensed
Quote from Intrepid :<list of critically acclaimed, privately funded TV shows>

For every Game of Thrones, there are a dozen more like Jersey Shore, Desperate Housewives, 16 and Pregnant, Toddlers and Tiaras, etc.

US TV programming is primarily focused upon mass-market appeal, which more often than not means dumbing everything down to absurdly simplistic levels. I don't even have a TV subscription, mostly because I simply don't watch many programs, but also just sifting through all the garbage is such a major chore it's not even worth my time.
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Forbin
S3 licensed
Quote from tristancliffe :P1 section amazing. Clarkson looked genuinely terrified by the speed at times. I want one.

My brother and I agreed on all of this.
Forbin
S3 licensed
LFS has very clear and pronounced lateral tyre deflection with low tyre pressures. When it was first introduced, I recall a lot of people said it was exaggerated. I seem to recall Scawen saying vertical deflection is not modeled. If you play with LFSTweak a bit you can get what appears to be vertical deflection. I'm pretty sure the pressure does affect ride height, so maybe that statement is outdated.
Forbin
S3 licensed
Looking good!

If I were you, though, I'd pull the mirrors off for track duty. Maybe the indicators too.
Forbin
S3 licensed
Quote from Crashgate3 :wat.

You think my statement erroneous? Pre-historic animals (e.g. dinosaurs) were intelligent. Dolphins are intelligent. Ergo, intelligent beings existed both before and after mass extinction events.
Forbin
S3 licensed
What broke?
Forbin
S3 licensed
Quote from Racer Y :How many times on this planet has some catastrophic event wiped out everything?

And yet life continues, including intelligent life both before and after such events.

Quote from Racer Y :And even if there was enough organic material to condition a planet for earth like or other life development, there's no guarantee that that life isn't or heading to or hit an evolutionary dead end.

Who is to say life on Earth is not? Who is to say we are not?

Quote from Racer Y :... odds of ... what it took to get from simple amino acids with proteins to simpletons with protractors. But again, I'm not adamant that there isn't intelligent life out there as if it happened once, it can happen twice. Just the odds doesn't look like a bet I'd make.

Do you have a source for the particular odds of life forming?
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Forbin
S3 licensed
Quote from Racer Y :I have a real hard time believing in intelligent life on other planets and I base that on my understanding of evolution.
As a species, we lucked out. So far... There are way too many variables, too many things that can go totally wrong with a planet in the time frame it takes to go from single cell to sentient.
And yeah, you can point out the numerous planets that are out there that can support life - and probably does. But intelligent life? I think that's a little too much to hope for at this time.

Considering how vast the galaxy is, let alone the universe, and how long everything has been around, I think it's a stretch to say it is unlikely there are other planets out there with intelligent life, or at least there were/will be at some point in time. If we evolved to be as we are, what is to prevent other beings from doing the same? We've already proven it's possible, and if it can happen once, it can happen again.

While there is a vast quantity of planets in the Milky Way galaxy and they vary wildly in terms of mass, distance from the habitable zone of their star(s), etc., there are many of those planets that have a high probability of being earth-like*, as shown by the Kepler Project:
http://en.wikipedia.org/wiki/Kepler_(spacecraft)
http://kepler.nasa.gov/Mission/discoveries/papers/

*This does not imply exactly like Earth. Earth-like objects are defined explicitly as planets that meets some specific criteria, particularly with regards to mass and distance from its star. At this time, the composition of these objects is unknown.
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Forbin
S3 licensed
It seems pretty clear the developer is quite the misogynist...
Forbin
S3 licensed
Quote from Chrisuu01 :Why?, I like it. But I suppose that is because I am not that well informed when in comes to engineering?

Which is why I think automation is perfectly suited to people who love technique but struggle with maths, people like me really.

Cam timing is far more complex than a 0-100 slider.

One of the main goals of valve timing is to manage the pressure waves generated by rapidly opening and closing valves. Proper valve timing generates a resonance at a particular RPM such that the design RPM is the most efficient. At this RPM, it's not just the piston falling that draws in air/fuel charge but also pressure waves in the intake tract. Likewise, exhaust gases are drawn out of the cylinder by pressure waves in the exhaust system.

SIDE NOTE: Two-strokes generally don't have any moving valves at all and rely upon an expansion chamber to generate resonant pressure waves at a particular RPM that reflect fresh charge that was drawn out the exhaust port and stuff it back into the cylinder. The expansion chamber is the bulbous part of many two-stroke exhaust systems and is effectively an acoustic supercharger. Its position in the exhaust pipe and overall shape (including length and width) determine the RPM at which resonance occurs.

Some of the specs used to identify cam timing are:
- lift (in units of distance), how far the valve opens into the cylinder
- duration (in degrees), the time the valve is open past a certain amount of lift
- centerline (in degrees) of the lift curve with respect to crankshaft rotation
- lobe separation (in degrees) between intake and exhaust centerlines

However, all of these specs merely attempt to represent a graph like this:



TDC (top dead center) and BDC (bottom dead center) refer to the position of the piston in its stroke (and the angle of the crankshaft).

There are also design considerations such as:
- do you want an interference engine, where the valves intrude upon the space swept by the piston? this means you can have more lift but it can also result in catastrophic engine failure if the cam centerline is sufficiently displaced in one direction or the other
- if you want a very fuel efficient engine, you don't want much valve overlap between intake and exhaust (i.e. both open at the same time), otherwise fuel can go in the intake port and straight out the exhaust port


All of this is implemented in Engine Analyzer. You can grab the free demo here:
http://performancetrends.com/Engine-Simulation.htm
Last edited by Forbin, .
Forbin
S3 licensed
You're basically describing a Triumph Rocket 3.

http://en.wikipedia.org/wiki/Triumph_Rocket_III
Forbin
S3 licensed
Quote from Racer Y :That's too easy....
No. Specialized racing. Bikes designed for Oval only.... OK Maybe Watkins Glen.. Not that sane people would do anything like that. The wrecks would be horrific. But wouldn't the bike be bad ass?

Probably something like this



Or this

Forbin
S3 licensed
Quote from Racer Y :there's some nut in California that makes and sells sportbikes with a jet engine in it. LOL talk about crotch rockets...

Jet engine is a bit of a misnomer. It's a turbine from a helicopter. It directs its power to the ground like any other motorcycle, rather than to the air like an airplane.

Quote from Racer Y :
Anyways, I wonder what a racing bike designed for NASCAR oval racing would look like?
I know there's flat track ovals but I mean a big oval, banked curves and I dunno...a 300 mile race. What would the bikes designed for that sort of racing look like? Maybe a longer wheel base? A front fairing that completely covered the front end? I'm not all that big a fan of NASCAR, but I am kind of curious as to what one of those motorcycles would look like if they had those sorts of races.

Probably something like this.

Forbin
S3 licensed
Quote from MoMo92i :Well to be honest, having everything which is higher that contact path is more important to have first before having a perfect tyre model. If you start with the tyre model, you will be misleaded by errors in suspension kinematics, aero load,...so your tyre can't be realistic...

How do you figure?

A suspension linkage has a well-defined movement path with equally well-defined spring rates, damping rates, camber curves, and toe curves. It largely boils down to simple geometry. Suspension is much easier to model than a tyre. Orders of magnitude easier.
Last edited by Forbin, .
Forbin
S3 licensed
Quote from Racer Y :I had heard Kawasaki made a turbo in the late 1970's. I thought they put it on a bigger bike than the 650 though. I thought they put it on the 1000 model they had

http://en.wikipedia.org/wiki/Kawasaki_GPZ750_Turbo

Quote from Racer Y :I heard the reason turbocharging wasn't so well received was because of turbo lag at the start was too slow and the big boost at the end was too dangerous.

I'm pretty sure that's exactly why they got rid of them so quickly. 80's turbos were notoriously laggy. Modern turbos are much better with respect to lag but I still prefer naturally aspirated.
Forbin
S3 licensed
Quote from Gills4life :Good grief, I bet you're a barrel of laughs on a night out.

Good anti-intellectual grief, I bet you're a right prick all the time.
Forbin
S3 licensed
Oops, I was wrong. The power requirement increases with the cube of velocity.

http://en.wikipedia.org/wiki/Drag_(physics)#Power
Forbin
S3 licensed
Quote from Gills4life :My 650cc at around 85bhp can get to 155mph with enough road. I don't see why a 675cc 110bhp bike with FAR less weight couldn't do the speed that he said.

Mass has no bearing on aerodynamic top speed for land-based vehicles. It only comes into effect when the slope of the surface is significantly off level such that gravity is helping or hindering, depending on whether it is positive or negative slope.

Also, aerodynamic drag increases with the square of speed, such that the force (and by extension, power) required to reach a particular speed is also squared.
Forbin
S3 licensed
Where did I say you need a PSU upgrade?
Forbin
S3 licensed
Quote from djgizmo68 :Gigabyte one only requires 1 x pci-e connector.

What gave you that impression?

Only differences are:
- Gigabyte is a better-known brand and may have a better cooler
- the Inno3D card is clocked higher

EDIT: Oh, I see you, mean one PCIe power connector. GTX660's TDP is only 140W. The PCIe slot itself supplies 75W, and each 6-pin connector supplies another 75W. I suppose it's possible the Inno3D requires two plugged in due to the higher overclock, but it may be able to get by with just one. Alternatively, there are adapters to take your 4-pin peripheral connectors and turn them into PCIe connectors.

http://www.amazon.com/s/ref=nb ... express%20power%20adapter
Last edited by Forbin, .
Forbin
S3 licensed
Quote from djgizmo68 :(Me being a Newb is just looking at which has got the highest specs)

If you mean looking at just the clock speed and memory capacity, please excuse me for a sec.

<facepalm>

Generally, video cards with the same GPU perform about the same.

Given equal GPU's, your only major choices are between one or two memory capacities and a stock or custom cooler. More memory can help with higher resolutions, but only to a point. A custom cooler may be quieter than a stock one and/or perform better. Your final minor choice depends on the level of factory overclock to the GPU and memory clock rates, which can offer a minor boost in performance.

Also, please refer to this, an updated version of the article I posted earlier:
http://anandtech.com/show/7703 ... buyers-guide-january-2014
Forbin
S3 licensed
Plenty of room to pass around the outside there, obviously not using their head.
Forbin
S3 licensed
Quote from Racer Y :Anyhow, you had these graphs of various models from various makes. a couple of posts back.
LOL you're the bike guru. you're a genius with this stuff. With your knowlege you should consider a career writing for motorcycle magazines, if you don't contribute already.

A solid grasp on how bikes function, decent riding ability, and google-fu do not a writer make. At least not an interesting one.
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