MotoGP 2017

[SectorOne]

One of the best qualis i´ve seen. Let´s hope the race provides similar amounts of entertainment.

[J.A.W.]

M.M. maintained his exclusive No 1 grasp on US Moto GP's, with a fine win after having to see off his
Honda team mate Dani P, who'd zapped to the front with a splendid hole-shot..

Tyre degradation played a big role again, with many sliding off a bumpy track, even Vinales for a rare DNF,
& Dani's choice of compound allowing Rossi to run him down to take 2nd.. ..a COTA P-B..
..thus gaining the points lead in the Championship standings..
( & a performance which earned the good ol' boy his traditional personal victory-lane arse-grab from his squeeze)..

Rossi had been penalized a 1/3rd of a second earlier - for cutting a corner, to his advantage - after
over-reacting to an apex bump with Zarco.. but it didn't affect the result..

Lorenzo selected soft compound which served him well with the reluctant to turn-in Ducati, & enabled him
to keep pace with his team mate Dovi, until late in the race, when the spent rubber slowed him down..

[Noetiepoerker26]

Some commentator said that the bumpyness of the track was in some way caused by Formula 1 cars running on it. Could someone explain this, or is it just utter BS?

[J.A.W.]

Some commentator said that the bumpyness of the track was in some way caused by Formula 1 cars running on it. Could someone explain this, or is it just utter BS?

Well, N-26, while the serious forces imposed on the track by F1 tyre inputs must contribute some,
..but its not like the track is unused by other machines between the annual FIA & FIM G.P. events..

FYI, your legend about 2 strokes VS 4 strokes aint right...
.. as a fact check of the comparative BMEP figures of the best N/A G.P. machines, 2T VS 4T, will clearly show.
N/A 4Ts must compensate for this torque deficit by turning extreme rpm, the very opposite of your idea..

[Noetiepoerker26]

FYI, your legend about 2 strokes VS 4 strokes aint right...
.. as a fact check of the comparative BMEP figures of the best N/A G.P. machines, 2T VS 4T, will clearly show.
N/A 4Ts must compensate for this torque deficit by turning extreme rpm, the very opposite of your idea..

Off topic: I know it's not completely true, but i like it as a quote nevertheless

[Andres125sx]

Some commentator said that the bumpyness of the track was in some way caused by Formula 1 cars running on it. Could someone explain this, or is it just utter BS?

Not that any other category is not contributing to the bumps, but yes, F1 causes more bumps than any other similar (is vehicle size) category, due to aero allowing the cars to corner and brake producing around 5G. That causes a lot of stress in the tarmac, much more than any other category without aero, so the usual process of any tarmac becoming bumpy is shortened by F1 cars

[J.A.W.]

Other fast, powerful, grippy-tyred cars with various degrees of downforce race at COTA, from V8 sedans through GT sportscars to WEC, as well as F1..

Anyhow..

Here's a physicist's explanation of how wheels cause that 'washboard' rippling effect on road/track surfaces..

http://physicsworld.com/cws/article/new ... ppled-road

[Muniix]

FYI, your legend about 2 strokes VS 4 strokes aint right...
.. as a fact check of the comparative BMEP figures of the best N/A G.P. machines, 2T VS 4T, will clearly show.
N/A 4Ts must compensate for this torque deficit by turning extreme rpm, the very opposite of your idea..

Off topic: I know it's not completely true, but i like it as a quote nevertheless

With turbulent jet ignition on the 4 stroke engines and direct injection the initial ultra lean combustion can be followed with multi phase combustion, injecting more fuel at maximum heat release, 8-12 atdc maintaining more constant cylinder pressure increasing torque per cycle with minimal friction due to favourable crank rod angle. The increased compression ratio providing high efficiency.

The old rules of thumb completely change, using cylinder pressure sensor and Gigaflops of compute now available calculating losses minimising them and maximising torque. The optimal strategy is identified.

They fixed the Hubble deep space telescope this way.

[J.A.W.]

FYI, your legend about 2 strokes VS 4 strokes aint right...
.. as a fact check of the comparative BMEP figures of the best N/A G.P. machines, 2T VS 4T, will clearly show.
N/A 4Ts must compensate for this torque deficit by turning extreme rpm, the very opposite of your idea..

Off topic: I know it's not completely true, but i like it as a quote nevertheless

With turbulent jet ignition on the 4 stroke engines and direct injection the initial ultra lean combustion can be followed with multi phase combustion, injecting more fuel at maximum heat release, 8-12 atdc maintaining more constant cylinder pressure increasing torque per cycle with minimal friction due to favourable crank rod angle. The increased compression ratio providing high efficiency.

The old rules of thumb completely change, using cylinder pressure sensor and Gigaflops of compute now available calculating losses minimising them and maximising torque. The optimal strategy is identified.

They fixed the Hubble deep space telescope this way.

Actually Marc, no..

The fundamentally lazy 4T simply cannot compete on a specific output basis or via power density,
so unless it is granted significant displacement advantage it loses, & even then.. the FIM still had to ban 2Ts..
..lest they should demonstrate a quicker average race speed, despite being handicapped so heavily..

None of the technical developments you note are 4T only, they are just as applicable to a 2T..
& of course, none of them can make a 4T do useful work on every piston down-stroke, either..

N-26's liking for that simply ludicrous "quote" is embarrassing... & especially on a technical forum..

[Noetiepoerker26]

[
N-26's liking for that simply ludicrous "quote" is embarrassing... & especially on a technical forum..

Why do you have to make such a fuzz about it? I know it's not correct, why should I change it? It's fiction.

[J.A.W.]

Frank appraisal by Lorenzo of getting his race-face on, with Ducati, after the Yamaha..
http://www.sportrider.com/motogp-lorenz ... -on-ducati

[Andres125sx]

Those are very interesting questions making a very good read =D>

[J.A.W.]

[
N-26's liking for that simply ludicrous "quote" is embarrassing... & especially on a technical forum..

Why do you have to make such a fuzz about it? I know it's not correct, why should I change it? It's fiction.

Maybe because this is a technical forum, & not a "fiction" forum?

Now, back to topic specifics..
Updates for Jerez this weekend include new engine developments by KTM, & front tyre combinations from Michelin..

[J.A.W.]

FP 2 at Jerez, & after a wet FP 1, some sunny conditions..

Fastest 250 G.P. lap holder at Jerez, Dani Pedrosa is quickest ( 1.5 secs in front of his factory Honda team mate M.M. in 14th),
followed by a couple of 'satellite' Honda boys, Miller & Crutchlow, then Lorenzo.. Ist factory Yamaha is M.V. in 6th..

Still, qualifying proper is yet to come..

KTM has reportedly gone 'big bang' with their new engine & have claimed 10th quickest in FP with Espargaro aboard..

[J.A.W.]

FP 3 & Dani stays on top, from Jorge who is showing his mettle, & M.M. - stepping up too.
Roll on Q tomorrow..