bruce

One beer and I already look blurry!!

build a powertap into that sucker Damn right!! New powertaps will have a 20mm axle, so will handle all that can be thrown at it!

Well, er, um no. Matthew Kimble is no longer with us, but good try. Well, um, no, that is Matthew Kimble... So, in the early '80s he would have been about -8 years old, impressive!

BMX track at Fourways Bike Park is just about ready. I'm gonna be getting me a Kuwahara Cruiser to play with!! I spent my youth riding a BMX bike. I think it is about to explode in this country!

One other possible scenario to consider is that the wheel is one of the driving wheels attached to a differential. When the wheel detaches, the remaining driving wheel loses thrust because the axle of the detached wheel spins (no diff lock). The vehicle loses forward thrust but the detached wheel continues at pretty much the same speed it was before, while the vehicle slows down. This does not require any action from the vehicles driver, who could be unaware of what has happened.

So, not such happy endings after all

So, not such happy endings after all

Greatwhite, you asked a deliberately simplified question. I gave you an answer that you declared categorically wrong without any conditions. I have given you two conditions which prove my point. Now you chose to reintroduce the truck/wheel scenario.

A stationary wheel is released on a decline - potential energy is converted to kinetic energy and the wheel accelerates. No additional energy has been added. A spinning flywheel is placed on the ground. Not additional energy has been added (energy is held in the wheel due to rotational kinetic energy), the wheel accelerates when it touches the ground due to the release of stored rotational energy.

It can accelerate if stored energy is released. No additional energy is added.

Not sure I understand your point. 94.7 wasn't a circuit race! Riders can bail and cruise home in a long race as well.

Circuit racing, just as they do in many other countries around the world.

Sure, but where is the force acting in the forward direction coming from, in order for there to be a nett positive force? GoLefty!! and I are in agreement on this point. Furthermore, rolling resistance is not keeping the wheel going the same speed as the truck when it is attached to the truck, the fact that it is attached to the truck is what is keeping it going the same speed. bruce2008-11-17 08:12:11

I offered, but they said I was no longer meat, I had become biltong! shadowchaser-d what's upset you so badly?

no it does not because we are concerned with linear acceleration not rotational acceleration which is almost impossible to observe with the wheel heading straight for you... If the wheel is in front of the vehicle, which is moving at constant velocity, then there must have been linear acceleration, as well as rotational acceleration because with no slippage or wheelspin the two are directly related. Don't change the scenario. Never did I say the wheel is in front of the vehicle. We don't know if the vehicle slowd down or not. YOu are adding information to suit your arguement. Read the scenario i poted again. If the vehicle is at constant velocity then the wheel will not accelerate away from it and run ahead. It cannot because the retarding froces have not bee removed nor changed direction, they have only reduced in magnitude but are still retarding forces. anOther question to ask; was the road flat or was it inclined? So you are saying that it is an optical illusion that the wheel is in front of the vehicle. Given the assumption that the vehicle has remained at constant speed. Which makes the entire discussion a moot point.

JB, weight is acting 90degrees to the direction of motion, and therefore cannot contribute to the nett acceleration in the horizontal plane.

no it does not because we are concerned with linear acceleration not rotational acceleration which is almost impossible to observe with the wheel heading straight for you... If the wheel is in front of the vehicle, which is moving at constant velocity, then there must have been linear acceleration, as well as rotational acceleration because with no slippage or wheelspin the two are directly related.

Andrew rides L4' date= L5 and L6, the group chases him around Jozi... [/quote] That's pretty much it. Andrew just rides hard and then he rests. I've tried to get him to do intervals, but usually just get a not so polite F.O. He does L5/L6 in the various hills on the route, and everybody else tries to hang on. Bruce, if he were to do more L4, L5 on his own in a more structured manner, would he not improve (not that he needs to improve) more so than riding in the bunch each morning? Probably. He did some interval training before Nationals this year, and produced the best numbers we've seen since he's been riding with a power meter. But his training is very similar to the way he races, so from a specificity perspective, it's no problem.

if his face was anything to go by' date=' he was simply cruising along with zero effort... as for the rest of them - i dunno... they were too far back so after getting him safely to the finish line i just headed off to go sort out some taxis in randburg area...[/quote'] James Lauter (sp?) doing the commentary on the line got a bit of a surprise when Andrew arrived, nearly missed him! Belive me, 0.9 Intensity for 1 hour hurts, he just hides it well. huh?!?!?!?!?!?!??!?!?? a big yellow bike with yellow headlights and hazzards on and strobes flashing away and hooting like mad and revving it's loud pipes comes tearing up and peels off into the "official cars" turn off at insane speed (almost seeing her @ss in the process) and he nearly misses the fact that there is a winner about to cross the line??????? eish, next year i'm fitting a mega-loud horn as well!!!!!!! Obviously not the most observant peanut in the pack

Yup' date=' he's not quite at his peak at the moment.[/quote'] Bruce, i speak under correction...but does Andrew not ride with a group from the Engen garage in the mornings? If that is the case, how would he be able to train his L4, L5, L6 zones if he is in a group? Andrew rides L4, L5 and L6, the group chases him around Jozi... That's pretty much it. Andrew just rides hard and then he rests. I've tried to get him to do intervals, but usually just get a not so polite F.O. He does L5/L6 in the various hills on the route, and everybody else tries to hang on.

if his face was anything to go by' date=' he was simply cruising along with zero effort... as for the rest of them - i dunno... they were too far back so after getting him safely to the finish line i just headed off to go sort out some taxis in randburg area...[/quote'] James Lauter (sp?) doing the commentary on the line got a bit of a surprise when Andrew arrived, nearly missed him! Belive me, 0.9 Intensity for 1 hour hurts, he just hides it well.

Note also the attack - 44km/h up Witkoppen