Rusty Bucket USA wrote:I guess a different way of saying what I'm trying to suggest goes like this:
Enough has changed in the weight balance on the bike since last year (rider mass, engine character, other "secret" design changes) that they have a problem on a full tank that they haven't had before. Issues with BridgeStone become a chicken-vs.-egg question and are likely inextricably linked.
Whether it's as simple as there's more rear grip than he was used to and that's throwing off the balance during full-tank, or whether all those changes are not kosher with (some of) the front tires this year, or both, I don't know... but that's what it looks like to me.
It could be interpreted that Hayden is experiencing the same problems, but is a little more prudent in managing it. Whether that's just the way he is, or is the lesson he learns taking longer runs in free practice, I guess, is the big question.
Rusty - I'm wondering whether it's not a very complex bag of problems that sometimes all conspire to shake the thing out of the groove. I'm thinking along the lines of a combination of frame, fork and swing arm stiffness and resonances plus tyre reaction plus weight balance. If the tyres - especially the front - are either not particularly consistent - and how often have we heard in the last six months of people in every camp not seeming to be able to find a consistent setting between tyres even in the one practice session? - then that would invalidate the data from earlier runs.
C/F has a very abrupt rise in stiffness - even though it can be tuned by varying thickness, thread direction etc - resonances can occur over a very small range of input conditions and just as quickly disappear. I suspect that a quite small range of variables for the tyre including track temp and weight could produce resonances throughout the bike that might be enough to break traction at the limits to which these guys ride. Unless the bike is comprehensively strain-guaged, such phase-points are unlikely to be easily discovered. You could put the whole thing on a stress jig and twist the heck out of it and that would tell you some - but not all - of the answers because you'd need to duplicate the tyre characteristics at the coefficient of friction of the track, carcass,tread temp,load and cyclical frame loading input.
It makes sense to me that Hayden's longer runs in practice give him more exposure to a greater range of conditions and hence almost certainly more experience of 'that uncertain feeling' and of how much margin for error to dial in - and that would seem to be currently sitting behind the Fiat Yamahas and the Repsol Hondas (well, most of the time!) in terms of lap times. No disrespect to Hayden is intended by that comment - he is doing a damn fine job this year of holding it together - but Stoner is, I think both expected and expects of himself to be at the very least podium material every race and always trying for a win. Hence Stoner is more likely to get into the critical zone more frequently than Hayden unless they both run around basically in tandem.
Hayden is doing absolutely exactly what a No.2 rider is usually expected - bring it home, bring it home well up the field, be the close back-up to the No.1 rider while he makes the running for the best possible result. I think what he said in that post Le Mans interview on Soup should be noted: the 'I couldn't have run that race 2/10ths faster' was to me as much a commentary on the capabilities of the bike as of the rider - and I rate Hayden highly.
Edit - changed 2/100ths to 2/10ths for Hayden's race - loose finger problem..