Joined May 2008
3K Posts | 79+
Southern Aridzona - Hell's doorstep.
This works fairly well.
13512:2.jpg]
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13514:Biagi_Monza_WSBK.mp3]
Play with the spectrum view parameters, then time-zoom in until the area of interest is adjacent to the frequency scale along the left of the window. Use the bottom edge of the pink zone as the frequency reference value. There's a bit of best-guess interpretation involved, but it should get you good ballpark values. You can then use this eyeballed value to determine which peak on the 'Plot Spectrum' graph is the correct one.
You'll need to adjust the upper and lower frequency limits to match the strongest peak harmonic(s) for each engine.
( edit - No need to manually enter the frequency range. Left Mouse click on the scale at left to zoom in, Shift-click to zoom out. You can also left-mouse-hold on the scale and drag, to highlight an area.)
Tweak the spectrogram RANGE value to filter more or less background noise. Gain and Freq/Dec gain should both be zero. Window type doesn't seem to matter too much. (Hamming, Hanning, Blackstone, Blackbeard... they all work about the same.)
Have fun!
Attachments
Joined May 2008
3K Posts | 79+
Southern Aridzona - Hell's doorstep.
Just had a look at the first few races from 2007
Hopper (Zook) - 17280, 17000, 17340, 17550
Stoner Qatar 18300, 18750, 18720. China 18960, 19020, 19100 WOT and 19530(!!) on the overrun. (Not a backshift.)
Rossi 17340 at Qatar. By China they had found some revs, 18400 and 18200, and a bit of power, but were still no match for the Ducati.
Hayden's Pedrocycle at Qatar 16920
Hopper (Zook) - 17280, 17000, 17340, 17550
Stoner Qatar 18300, 18750, 18720. China 18960, 19020, 19100 WOT and 19530(!!) on the overrun. (Not a backshift.)
Rossi 17340 at Qatar. By China they had found some revs, 18400 and 18200, and a bit of power, but were still no match for the Ducati.
Hayden's Pedrocycle at Qatar 16920
Joined May 2008
3K Posts | 79+
Southern Aridzona - Hell's doorstep.
Estoril Onboard:
No real surprises.
J-Lo and Stoner both seemed to turn it up a few hundred RPM during the last half of the race.
Pedrosa's average was a little low, but given the limited samples this may be statistically meaningless.
Stoney
15960 15720 15960 16260 16140 15840 16320 (L25, making a break for it) 16320 (last lap)
Gilligan
15840 15540 15900 15840 15840
Jorge
15720 15840 16200 15780 15840 16200
Cal
15920 15480 15600
Bautista
15200
Bradl
15720 15960 16080
Rossi
17040 16560
Dovi
15660 16290
No real surprises.
J-Lo and Stoner both seemed to turn it up a few hundred RPM during the last half of the race.
Pedrosa's average was a little low, but given the limited samples this may be statistically meaningless.
Stoney
15960 15720 15960 16260 16140 15840 16320 (L25, making a break for it) 16320 (last lap)
Gilligan
15840 15540 15900 15840 15840
Jorge
15720 15840 16200 15780 15840 16200
Cal
15920 15480 15600
Bautista
15200
Bradl
15720 15960 16080
Rossi
17040 16560
Dovi
15660 16290
Joined May 2008
3K Posts | 79+
Southern Aridzona - Hell's doorstep.
Lex, you might want to give this a look. Max's RSV4 at Monza last weekend. The usual caveats apply, but if the sample is valid he's revving well over 15K (!) No luck with Sykes' Kwacker or the BMW bikes.
http://dl.dropbox.com/u/60092457/Biagi_Monza_153xxRPM.mp3
http://dl.dropbox.com/u/60092457/Biagi_Monza_153xxRPM.mp3
Lex, you might want to give this a look. Max's RSV4 at Monza last weekend. The usual caveats apply, but if the sample is valid he's revving well over 15K (!) No luck with Sykes' Kwacker or the BMW bikes.
http://dl.dropbox.co...za_153xxRPM.mp3
Randy revs the RSV4 engine as far as it will go. 15,300rpm is 27m/s. Not within the realm of possibility, imo. We've yet to see piston velocities that high from the MotoGP bikes, and they are purpose built to reduce friction.
Joined May 2008
3K Posts | 79+
Southern Aridzona - Hell's doorstep.
But folks will lap it upI keep saying I'm getting off the boat ..... never buying another newfangled bit of gear ....... but I get there too eventually ..... I hate wasteful obsolescence
Case in point (and link to a very useful database.)
http://www.dr.loudness-war.info/ind...teely&search_album=gaucho&sort=year&order=asc
If Steely Dan can get f'd up, ANY music is vulnerable. It does look like the last 'sooper dooper' re-master finally got it right.
Joined May 2008
3K Posts | 79+
Southern Aridzona - Hell's doorstep.
Nope, you're screwed!
Lex's explanation is pretty dang good. Please give this a read.
http://www.powerslid...69
If it still isn't clear, holler.
I'll have more time tomorrow and may get inspired to write a 'how to' procedure - something I've been wanting to do for a while.
Joined May 2008
3K Posts | 79+
Southern Aridzona - Hell's doorstep.
Gotta admit that I haven't fired up the turntable in years. My decades-old Steely CDs sound mighty good.
Ooof, look at poor Ozzy...
http://www.dr.loudness-war.info/index.php?search_artist=Ozzy+Osbourne&sort=year&order=asc
Every time they touch one of his early albums, they make it worse....
First sightings of onboard rev counter on the Ducati at Barcelona. Interestingly, revs displayed had been turned down around 1K between FP1 and FP2 ...
Joined Oct 2006
25K Posts | 4K+
Your Mom's House
Thanks Krop, great write up on FP. After reading this I'm really wondering about the Ducati/Rossi situation, is the common belief in the paddock that they are just fiddling, and no real race results in the dry are expected until the new config at Laguna? And obviously the new config is potentially a re-designed narrower V4, as its plain to see even for a casual observer that the big 90-degree lump is, and has always been 'THE' problem. Now is Laguna too late for Rossi to grab the Honda seat, or depending on Jorge, the left over Yamaha seat? I'm sure by now most believe that Ducati cannot build a competitive motogp bike for the dry, I'm still holding hope that this partnership will work, but my head tells me its doomed-the fact that its taken so long for Ducati to implement real change, and particularly the nuclear bomb that was Stoner's retirement have moved the goalposts.
I would imagine to rumors are rife in the paddock, just wondering if you've heard any semi-credible strategies yet?
Joined Oct 2006
25K Posts | 4K+
Your Mom's House
Im thinking the sense of urgency to build a bike that might attract Rossi has just gone into mach 5. It would take a bike capable of winning the last 2-3 races of the season. Which i doubt. When Gavin Emmett interviewed VR at Le Mans, he seemed not to discount a Honda possibility. So im thinking, the "dream marriage" will end in divorce at the end of the season.
VR will return to a factory Jap bike with a 1:2 chance of lifting a title (much better than when it was 1:3). The stint at Ducati will be chalked up to Ducatis incompetence and forever more be only remembered for VR heroic effort to turn a .... factory around. The blame for the failure will be laid at Ducs feet as a reluctant factory who just wouldnt listen to the voice of VR.
Mark my words.
Edit to add 2nd paragraph.
VR will return to a factory Jap bike with a 1:2 chance of lifting a title (much better than when it was 1:3). The stint at Ducati will be chalked up to Ducatis incompetence and forever more be only remembered for VR heroic effort to turn a .... factory around. The blame for the failure will be laid at Ducs feet as a reluctant factory who just wouldnt listen to the voice of VR.
Mark my words.
Edit to add 2nd paragraph.
But I thought that Ducati built a far superior bike in 2007 that won many races in the dry that Stoner just sat on whilst it won and then went on to win more races than anyone else, mostly in the dry?
I think Ducati can and have built a bike that a truly talented rider can win on but have failed to build a bike that lesser riders can win on.
I think Ducati's biggest failure has been in rider recruitment and retention.
I think Ducati can and have built a bike that a truly talented rider can win on but have failed to build a bike that lesser riders can win on.
I think Ducati's biggest failure has been in rider recruitment and retention.
Joined Aug 2008
6K Posts | 748+
Thailand
MA - please give us a list of the "truly talented" riders you believe Ducati failed to recruit.
Failed to retain... I'll start the list: Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey...
Failed to retain... I'll start the list: Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey, Casey...
There are no riders as talented as Stoner in MotoGP at present. My reference to failed recruitment strategy is their recruitment of Rossi. Not because Rossi is not a great rider but because if Rossi failed, which he so far has, then it was never going to be his fault and if he succeeded it was never going to be Ducati's success to claim. In other words recruiting Rossi was always a lose, gain nothing scenario for Ducati.
They would have been much smarter recognising the skill set that Stoner had that allowed him to ride the bike and then searching for a rider with the same or similar skill set. They did to a degree with Hayden but unfortunately Hayden lacks the same mental toughness that Stoner has. To be honest I don't know who they could have hired but what I do know is that hiring riders who grew up on mini bikes was never going to work. Anyone with even a bit of unbiased knowledge would have declared the Ducati as the complete opposite of what Rossi, Melandri, Capirossi needs to win races.
They would have been much smarter recognising the skill set that Stoner had that allowed him to ride the bike and then searching for a rider with the same or similar skill set. They did to a degree with Hayden but unfortunately Hayden lacks the same mental toughness that Stoner has. To be honest I don't know who they could have hired but what I do know is that hiring riders who grew up on mini bikes was never going to work. Anyone with even a bit of unbiased knowledge would have declared the Ducati as the complete opposite of what Rossi, Melandri, Capirossi needs to win races.
