-
Soweto888 Holding on to vehicles is against the law - I'm sure it is. On the other hand, drafting behind buses and the like is absolutely fair game. Just make sure you know where all the pot holes in the road are. And watch those brake lights!
Actually, it's probably not. Well, it's illegal in Oz so and they probably copied UK law (being the thieving convict scum they are).
-
drafting buses over waterloo bridge is one of my favourites. If you look through the back window of the bus you can see the stopping sign in the bus which can be a bit of warning.
I'd never grab onto a vehicle on a fixie though. That is fucking insane. one pothole/wobble... I guess at least if it was a routemaster and you were grabbing the back rail you could casually drag yourself onto the rear platform and flick the conductor your fare.
-
Nothing like a nice slipstream to get you to work in a hurry. Not buses so much - they have a nasty habit of stopping! But something big and heavy is perfect as it's less likely to change speed quickly. The other thing is to make sure you've got an exit to one side in case they hit the brakes and you need to slip round the side. And it goes without saying, not if you're brakeless!
-
hippy [quote]Soweto888 Holding on to vehicles is against the law - I'm sure it is. On the other hand, drafting behind buses and the like is absolutely fair game. Just make sure you know where all the pot holes in the road are. And watch those brake lights!
Actually, it's probably not. Well, it's illegal in Oz so and they probably copied UK law (being the thieving convict scum they are).[/quote]
Ha-ha. Right enough, I don't suppose the police encourage it - you're supposed to keep a safe distance and all that. I just meant...well, I guess I just meant that it's something I do, whereas I would never ever, ever grab onto the side of a vehicle.
-
From Bicycling Science - the maximum deceleration of a cyclist with any kind of brakes before they go over the handlebars is about 0.5g. For a motor car (and a tandem) it is limited by the tyre to road friction and goes up to about 0.8g - 60% better than a bicycle.
The moral of this tale? Watch out when drafting 'cause they can stop quicker than you and stacking the back of a vehicle can hurt. -
we should be able to because the stopping power is just less then double where their weight, and therefor velocity (mass x speed) is much more then double.
-
chris crash we should be able to because the stopping power is just less then double where their weight, and therefor velocity (mass x speed) is much more then double.
I think you are wrong but I don't understand the "sentence" you typed so I can not be sure.
-
some one said that we could stop at about 0.5g with a front break, and cars at 0.8g, so they would have roughly 60% more stopping power.
they would also have more mass, a lot more mass, greater then 60% more, so i at the same speed would have more velocity and therefore a longer stopping distance. i would also hazard a guess that the 0.8g is for all four wheels with the pedal break, while the 0.5 is for just a front.
-
chris crash we should be able to because the stopping power is just less then double.
Where do you get that from? On a bike, maximum deceleration is determined by the angle between the centre of mass and the front axle. Once your deceleration reaches a certain fraction of g, you'll get a net moment the wrong way around the front wheel and over you go.
On a car, the centre of mass is lower and further back, so they can fit much stronger brakes without worrying about the thing flipping over forwards under braking. The limiting factors then are traction and the strength of the brakes themselves. Well, they have a more rubber on the road (though I don't know if that makes as much difference as you might think - it's probably more to do with the texture of the rubber) and you can bet the calipers on car disc brake can squeeze a lot harder than you can with your little lever!
-
chris crash some one said that we could stop at about 0.5g with a front break, and cars at 0.8g, so they would have roughly 60% more stopping power.
they would also have more mass, a lot more mass, greater then 60% more, so i at the same speed would have more velocity and therefore a longer stopping distance. i would also hazard a guess that the 0.8g is for all four wheels with the pedal break, while the 0.5 is for just a front.
It is to do with the center of gravity being high on bike that limits braking power of a bike. The friction which can be archived between the fount tyre and road is greater than or equal to the amount needed to allow rotation about a point (the point in question being the contact point of front wheel to the road surface). DUe to the longer nature of a tandems and cars (also the lower center of gravity) the amount of force required for the car / tandeml to pivot about the contact point it greater than the maximum friction that can be achieved.
-
TheBrick(Tommy) [quote]chris crash some one said that we could stop at about 0.5g with a front break, and cars at 0.8g, so they would have roughly 60% more stopping power.
they would also have more mass, a lot more mass, greater then 60% more, so i at the same speed would have more velocity and therefore a longer stopping distance. i would also hazard a guess that the 0.8g is for all four wheels with the pedal break, while the 0.5 is for just a front.
It is to do with the center of gravity being high on bike that limits braking power of a bike. The friction which can be archived between the fount tyre and road is greater than or equal to the amount needed to allow rotation about a point (the point in question being the contact point of front wheel to the road surface). [/quote]
good point (pun not intended :) - it's the angle to the contact patch, not the axle, that matters.chris, the extra mass of the car doesn't matter - a car at 0.5g stops in the same distance as a bike at 0.5g, so at 0.8g they've got a significant edge.
-
Skullhead [quote]chris crash yeah but when our girls talk it doesn't make you cringe.
I hope you're joking about this, and you know that the whole world hates america.[/quote]
you should know never to take anything i have said serriously under any circumstance.
every one else. right i was confused, velocity is for impact not stopping....
-
These guys were masters of hitching lifts, they give a decent dash of realism to every day life too!
-
On Topic, I think drafting other cyclists (with their approval) is fine. all this other shitnit you guys and girls are talking about is PLAIN NUTS. Pratts who do this deserve to get mashed, especially 'skitching' (even that word sucks). Maybe the gentle bus draft up hill/out of headwind is an exception, when you KNOW the roads' vaugaries. [sp?!]
check me.
-
Skullhead Pratts who do this deserve to get mashed.
I am not condoning the actions but deserve to be crushed!?
-
Caspar These guys were masters of hitching lifts, they give a decent dash of realism to every day life too!
don't know about you but I always thought that The X-Men should have been a film about a bunch of post-op trangender individuals.
hippy
rpm
B__
Scrapper
oddsock
tynan
|³|MA3K
Soweto888
d_c
chris_crash
TheBrick(Tommy)
Skülly
Rapsac-
Post a reply
About
Drafting busses and lorries
Posted by
@arup
ok what they say yes, but not the voice.... what the hell is it that makes any good looking aussie girl have an accent like dragging nails over a rusty aircraft wing?[/quote]
That's just the Queenslanders. Don't worry their fscking accent gets on my nerves too!