OzVMX Forum
Clubroom => Tech Talk => Topic started by: Berwick Boy on May 22, 2014, 06:45:09 pm
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No. ONE:
In November, 1970, a Yamaha RT1 Enduro is cruising highway at 5,700 RPM, and sits on 95 kph.
Question: How far does it travel (in metres) per single revolution of the crankshaft?
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No. ONE:
In November, 1970, a Yamaha RT1 Enduro is cruising highway at 5,700 RPM, and sits on 95 kph.
Question: How far does it travel (in metres) per single revolution of the crankshaft?
0.2777777778 meters traveled per crank revolution
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Yep thats what I got 0.27777as many7s as you want8
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:D
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Was metric in then? J
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I have a feeling the official change to speed signs in NSW happened in 1974(MPH to KPH), at the beginning of the financial year. Could be wrong though. The question asked is traveled over a distance of 95,000 meters though.
If you are building a secret RTI weapon, I want in on it Berwick Boy ;D
Big John may too ;D
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Nothing happening ... just doing the maths
(http://i1043.photobucket.com/albums/b431/DoggyDigger/RT1_zps16230434.jpg) (http://s1043.photobucket.com/user/DoggyDigger/media/RT1_zps16230434.jpg.html)
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In that case it will take 3.5999999997 crank revolutions to cover a distance of one meter.
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No. TWO:
In 1979 at Valkenswaard, Jeff Leisk ran out of petrol. I just phoned Buddha.
He reckons it was about 2 mins per lap, and they ran 10.5 litres.
He recalls it as 22 laps, and that Leisk made it around 20.75 times.
Question: How many extra mls of fuel would he have needed to finish the last one and quarter laps?
(Please answer in mililitres, or fractional number of 370 ml coke cans)
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;D ;D ;D
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He would have needed an extra 632.5 ml's to finish or 1.7 coke cans of the good stuff.
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Three (sorry for the thread invasion Mr Boy ;)) The Question - Approximately to the nearest 10000, how many crankshaft revolutions does a Top Fuel dragster do in a 4.5 second run from green light to finish line (Only) 20000, 30000, 40000 50000+?
Answer 1800... yes 1800 What's the maths to show that?
Help hints" Distance and RPM
Top fuel dragsters are the fastest sanctioned category of drag racers, with the fastest competitors reaching speeds of 330 miles per hour (530 km/h) and finishing the 1,000 foot (300 m) runs in 3.7 seconds, or the full quarter mile (402 m) in 4.4 seconds.
Because of the speeds, this class almost exclusively races to only the 1,000 foot (300 m) distance, and not the traditional 1/4 mile (1,320 foot / 402 m). The rule was changed in 2008 by the National Hot Rod Association following the fatal crash of Funny Car driver Scott Kalitta during qualifying at the SuperNationals, held at Old Bridge Township Raceway Park in Englishtown, NJ. The shortening of the distance was used in the FIA at some tracks, and for 2012 is now the standard Top Fuel distance. The Australian National Drag Racing Association is the only internationally recognized sanctioning body that races at 1,320 foot for the majority of races in Top Fuel.
Measuring the power output of a top fuel engine directly is not always feasible. Certain models use a torque sensor incorporated as part of the RacePak data system. Dynamometers that can measure the output of a Top Fuel engine exist; however, the main limitation is that a Top Fuel engine cannot be run at its maximum power output for more than 10 seconds without overheating or possibly destroying itself explosively. The engine power output can also be calculated based upon the car's weight and its performance. The calculated Power output of these engines is most likely somewhere between 8500 and 10,000 horsepower[citation needed] (approximately 6000-7500 kilowatts), which is about twice as powerful as the engines installed on modern Diesel locomotives, and approaches the power output of the largest aviation turboprop engines, with a torque output of approximately 6000 lbf·ft (8135 N·m) and a brake mean effective pressure of 80–100 bar (8.0-10 MPa)
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632.528ml
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No. ONE:
In November, 1970, a Yamaha RT1 Enduro is cruising highway at 5,700 RPM, and sits on 95 kph.
Question: How far does it travel (in metres) per single revolution of the crankshaft?
0.2777777778 meters traveled per crank revolution
That would be metre not meter. Just sayin' :P :P :P ;D ;D ;D
The unit is very important :D
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1st grade maths,,,,is there a piont to this,,,,do we win something ?? or is this just suckin up valuable drinking time??
Me thinks I will go and load the two bikes I just sold,, yeap you heard right!!
Sold one last week as well,yeap never thought it would happen ::)
And something more productive than a quiz without free beers ::) would be
to go and make room for me new Maico, oooh yeah baby, come to Papa 8) ;D
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I know it's simple maths ... but in my opinion it's fun. As a kid, I'd often work out actual
CCs of a bike, when reading bore and stroke in brochures. I like numbers :)
(And apparently we need to do this stuff from this age on, or otherwise it's Sudoku)
(http://i1043.photobucket.com/albums/b431/DoggyDigger/leisk_zps2746123e.jpg) (http://s1043.photobucket.com/user/DoggyDigger/media/leisk_zps2746123e.jpg.html)
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No. ONE:
In November, 1970, a Yamaha RT1 Enduro is cruising highway at 5,700 RPM, and sits on 95 kph.
Question: How far does it travel (in metres) per single revolution of the crankshaft?
0.2777777778 meters traveled per crank revolution
That would be metre not meter. Just sayin' :P :P :P ;D ;D ;D
The unit is very important :D
Get with it Greg, there is no such thing as an Aussie spell checker ::) ::)
Ask Denny boy and Greggy Holmes if you don't believe me ;D
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I know it's simple maths ... but in my opinion it's fun. As a kid, I'd often work out actual
CCs of a bike, when reading bore and stroke in brochures. I like numbers :)
(And apparently we need to do this stuff from this age on, or otherwise it's Sudoku)
(http://i1043.photobucket.com/albums/b431/DoggyDigger/leisk_zps2746123e.jpg) (http://s1043.photobucket.com/user/DoggyDigger/media/leisk_zps2746123e.jpg.html)
Yeah, me too,,,,I wish I had a bigger bank account to do it with though;D ;D ;D
That's a good sketch, cracks me up ;D ;D ;D
and I didn't need the spell checker to type that Scrivo ;D ;)
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Me too
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Measured in pascals(N/m2) how much spring tension(force) does a circlip require to retain a set of Montesa fork dampers ;D
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And I want to see an honest answer up here, by the time I get back from the bottloe
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OUCH!!
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Isn't pascals the unit of air pressure? Kilo-pascals, or naa that be a Latin American axe murderer. n/m2 maybe Newton /metres Squaredances.
Sorry it's these great night time Flu pills 6 of um an shites I be feelin bloody finnnnnnne nows .. 8)
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Measured in pascals(N/m2) how much spring tension(force) does a circlip require to retain a set of Montesa fork dampers ;D
carried out an RCA on the fork remains to determine what happened. As usual at least three things came together to give the Ohhhh Far...........k moment. If any any of those had been eliminated there would have been no ouch moment.
That crash makes two wacks (or whacks whichever you prefer) on the head in a little over a year, remember the working bee incident ::) :'( when you craddled my head as I flaked it and fortunately I came too just before you launched into mouth to mouth :o :o :o :o
To answer your question? ideally for circlip that size about 560 kp/mm2 but as low as 480 kp / mm2 should do the job
note the unit kilopascal/millimetre2 ;D :-X
The ones in the GP Monty forks appear to have had 1 kp/mm2 :o :o
At least I didn't fall (pun intended) for the old I'm completely stuffed so I'll do just one......... more la......p ;) crash :-[ :o ;D ;D ;D ;D ;D ;D jokin OK
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Another numerical topic. If working out historical costs - to see what
it costs in today's money - I use a very rough estimate of doubling the money for every
decade.
IE: If a DT1 cost $650 in 1970, then I'd double that for every decade
1970 $650
1980 $1300
1990 $2600
2000 $5200
2010 $10,400 (holds fairly true)
2020 $21K (fails ..? I don't think a YZF will reach this)
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Bizzzzzzzzzzzzzzzzzzzz, sort of wrong boys :'(
Isn't pascals the unit of air pressure? Kilo-pascals, or naa that be a Latin American axe murderer. n/m2 maybe Newton /metres Squaredances.
Sorry it's these great night time Flu pills 6 of um an shites I be feelin bloody finnnnnnne nows .. 8)
About time you sacked that doctor Tim ;D ;D ;D
Measured in pascals(N/m2) how much spring tension(force) does a circlip require to retain a set of Montesa fork dampers ;D
carried out an RCA on the fork remains to determine what happened. As usual at least three things came together to give the Ohhhh Far...........k moment. If any any of those had been eliminated there would have been no ouch moment.
That crash makes two wacks (or whack whichever you prefer) on the head in a little over a year, remember the working bee incident ::) :'( when you craddled my head as I flaked it and fortunately I came too just before you launched into mouth to mouth :o :o :o :o
To answer your question? ideally for circlip that size about 560 kp/mm2 but as low as 480 kp / mm2 should do the job
note the unit kilopascal/millimetre2 ;D :-X
The ones in the GP Monty forks appear to have had 1 kp/mm2 :o :o
At least I didn't fall (pun intended) for the old I'm completely stuffed so I'll do just one......... more la......p ;) crash :-[ :o ;D ;D ;D ;D ;D ;D jokin OK
We are governed by the metric system in this country and as a base line for the scientific community, as such "The unit of tension is the same as the basic unit of force" Its one of those ambiguities.
A pascal is a measure of force, pressure or tension per unit area, defined as one newton per square meter, whoops metre ::).
You will argue all your life long, but the unit of spring tension is correctly measured in pascals. Although because One Pa = one N/m2, you will find that most say for example suspension guys will quote in N/m2.
Nut indeed the Scientific community chooses and does quote spring tension in Pa(Pascals)
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Top Fueler needs 120hp to drive the fuel pump and 600hp to drive the blower. Pistons cost $60 each plugs $2
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At least I didn't fall (pun intended) for the old I'm completely stuffed so I'll do just one......... more la......p ;) crash :-[ :o ;D ;D ;D ;D ;D ;D jokin OK
Yeap some stuff we just have to live with ::) ::), like flipping your bike on the start line ::) some turtles just aren't ever gunna let ya forget >:( ::) ??? ;D ;D ;D
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I stand corrected. Meter it is! Never liked the way metre was pronounced anyway :-X
Enjoy your new Maico
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Gee, apologies to your thread with my drivel Berwick Boy ::) ::) :-[
Never liked the way metre was pronounced anyway :-X
Enjoy your new Maico
Thanks, I am excited to be picking this Maico up tomorrow. Its a beautiful goer ::)
I have never accepted the way the French Academy of Sciences imposed the their way of spelling Metre upon the rest of us, just because it was their concept, wankers.
Educations vary, even in the same country.
That is what I recalled
Just found this,
Link to Unit of tension (http://wiki.answers.com/Q/Unit_of_tension?#slide=1)
Goodnight :)
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how many crankshaft revolutions does a Top Fuel dragster do in a 4.5 second run from green light to finish line (Only) 20000, 30000, 40000 50000+?
Not being smart Tim but at 8000 rpm = 599 revs and at 10000rpm 749revs. :o
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No. ONE:
In November, 1970, a Yamaha RT1 Enduro is cruising highway at 5,700 RPM, and sits on 95 kph.
Question: How far does it travel (in metres) per single revolution of the crankshaft?
I came up with 3.6
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Double check your awnser Geoff.
3.6 m/rev X 5700 RPM = 20520 m/min X 60 = 1231200 m/h divide by 1000 to get kph, 1231.2 kph
Even a well tuned rt1, down hill, wont get to those sorts of speed.
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Doh!
I didn't think it all the way through
3.6 is the number of revolutions per metre so distance traveled per revolution is 0.27777 mtrs as already mentioned.
I have heard of DT owners making exorbitant claims about top speed though
I can calculate the dimensions for an expansion chamber though.
No, no, honest, I can
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Doh!
I didn't think it all the way through
3.6 is the number of revolutions per metre so distance traveled per revolution is 0.27777 mtrs as already mentioned.
I have heard of DT owners making exorbitant claims about top speed though
I can calculate the dimensions for an expansion chamber though.
No, no, honest, I can
Just need to ride a RT1 to know its twu.
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Not being smart Tim but at 8000 rpm = 599 revs and at 10000rpm 749revs. :o OOPS I should have said 800 :-[
1800 allows for the unavoidable wheelspin from the slicks from the 1000+hp per cylinder bit.
Still I would be amazed at how many answer 50000+ ;)
Read the bit about ANDRA being the only major competition around the world that still runs the full quarter mile ;)
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Not being smart Tim but at 8000 rpm = 599 revs and at 10000rpm 749revs. :o OOPS I should have said 800 :-[ 1800 allows for the unavailable wheelspin from the slicks from the 1000+hp per cylinder bit.
Still I would be amazed at how many answer 50000+ ;)
Read the bit about ANDRA being the only major competition around the world that still runs the full quarter mile ;)
The first time i saw the revs per 1/4 mile i was stunned.
They were quoting about 480revs [ slow revver ] which sounds insane until you do the maths.
A better one was the fuel used in that 4.5 secs.
If I remember right it was over 100 ltrs.
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Quote "A ride of a life time " Tim you will enjoy this ;)
http://www.youtube.com/watch?v=03Ybyq6osNY&feature=youtu.be&a
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I dont think 100litres is correct Mike. I have heard 20-22 for a single pass. Another interesting fact is that a top fuel engine's crankshaft can twist up to 25 degrees from front to back under full load. Camshafts are set to take this into account.
Cheers, Grahame
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I read a stat that if a dragster was to stage as a moto gp bike went past at top speed, the draggy would still beat it to the 1/4 mile post..where the brains trust on working that out?
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pause and read consumption at 18 seconds
http://www.youtube.com/watch?v=bS9VTapHRHg
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Some real cool facts about top fuel dragsters I stumbled across.....
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* One dragster's 500-inch Hemi makes more horsepower then the first 8 rows at Daytona.
* Under full throttle, a dragster engine consumes 1 1/2 gallons of nitro per second, the same rate of fuel consumption as a fully loaded 747 but with 4 times the energy volume.
* The supercharger takes more power to drive than a stock hemi makes.
* Even with nearly 3000 CFM of air being rammed in by the supercharger on overdrive, the fuel mixture is compressed into nearly-solid form before ignition. Cylinders run on the verge of hydraulic lock.
* Dual magnetos apply 44 amps to each spark plug. This is the output of an arc welder in each cylinder.
* At stoichiometric (exact) 1.7:1 air/fuel mixture (for nitro), the flame front of nitromethane measures 7050 degrees F.
* Nitromethane burns yellow. The spectacular white flame seen above the stacks at night is raw burning hydrogen, dissociated from atmospheric water vapor by the searing exhaust gases.
* Spark plug electrodes are totally consumed during a pass. After 1/2 way, the engine is dieseling from compression-plus the glow of exhaust valves at 1400 degrees F. The engine can only be shut down by cutting off its fuel flow.
* If spark momentarily fails early in the run, unburned nitro builds up in those cylinders and then explodes with a force that can blow cylinder heads off the block in pieces or blow the block in half.
* Dragsters twist the crank (torsionally) so far (20 degrees in the big end of the track) that sometimes cam lobes are ground offset from front to rear to re-phase the valve timing somewhere closer to synchronization with the pistons.
* To exceed 300mph in 4.5 seconds dragsters must accelerate at an average of over 4G's. But in reaching 200 mph well before 1/2 track, launch acceleration is closer to 8G's.
* If all the equipment is paid off, the crew worked for free, and for once NOTHING BLOWS UP, each run costs $1000.00 per second.
* Dragsters reach over 300 miles per hour before you have read this sentence.
Did you know …
… that the nitromethane-powered engines of NHRA Top Fuel dragsters and Funny Cars produce approximately 7,000 horsepower, about 37 times that of the average street car?
… that one cylinder of the eight cylinders of a Top Fuel dragster or a Funny Car produces 750 horsepower, equaling the entire horsepower output of a NASCAR engine?
… that the gasoline-powered engines of NHRA Pro Stock cars produce about 1,200 horsepower, about eight times that of the average street car?
… that an NHRA Top Fuel dragster accelerates from 0 to 100 mph in less than .8-second, almost 11 seconds quicker than it takes a production Porsche 911 Turbo to reach the same speed?
… that an NHRA Top Fuel dragster leaves the starting line with a force nearly five times that of gravity, the same force of the space shuttle when it leaves the launching pad at Cape Canaveral?
… that an NHRA Funny Car is slowed by a reverse force more than seven times that of gravity when both parachutes deploy simultaneously?
… that NHRA Top Fuel dragsters and Funny Cars consume between four and five gallons of fuel during a quarter-mile run, which is equivalent to between 16 and 20 gallons per mile?
… that NHRA Top Fuel dragsters and Funny Cars use between 10 and 12 gallons of fuel for a complete pass, including the burnout, backup to the starting line, and quarter-mile run?
… that NHRA Top Fuel dragsters and Funny Cars travel the length of more than four football fields in less than five seconds?
… that NHRA Top Fuel dragsters can exceed 280 mph in just 660 feet?
… that from a standing start, NHRA Top Fuel dragsters accelerate faster than a jumbo jet, a fighter jet, and a Formula One race car?
… that a fuel pump for an NHRA Top Fuel dragster and Funny Car delivers 65 gallons of fuel per minute, equivalent to eight bathroom showers running at the same time?
… that the fuel-line pressure for NHRA Top Fuel dragsters and Funny Cars is between 400 and 500 pounds, about 20 times greater than the pressure on passenger-car fuel pumps?
… that depending on size and angle, the large rear wing on an NHRA Top Fuel dragster develops between 4,000 and 8,000 pounds of downforce?
… that the 17-inch rear tires used on NHRA Top Fuel dragsters and Funny Cars wear out after four to six runs, or about two miles? Some brands of passenger-car tires are guaranteed for 80,000 miles.
… that it takes just 15/100ths of a second for all 7,000 horsepower of an NHRA Top Fuel dragster engine to reach the rear wheels?
… that it's desirable for an NHRA Top Fuel dragster to race with its front wheels inches off the ground for about the first 200 feet of the run? This ensures proper weight transfer to the rear wheels, a crucial part of a good launch and quick run.
… that the nitromethane used to power the engines of NHRA Top Fuel dragsters and Funny Cars costs about $30 per gallon?
Sources: NHRA Communications and Technical Departments, NHRA race teams, motorsports equipment manufacturers (and boostedpimp)
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I dont think 100litres is correct Mike. I have heard 20-22 for a single pass. Another interesting fact is that a top fuel engine's crankshaft can twist up to 25 degrees from front to back under full load. Camshafts are set to take this into account.
Cheers, Grahame
As I said " if my memory is correct" which it probably aint.
Maybe it was the fuel cost for 4.5 secs.
If you go back in history you will find a period where the rails were doing almost the same times as now.
Space Shuttle fuel did the trick. :o
Banned it they did.
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and like various other motor sports Aussie top fuel , prostock and top door slammer engine builders and designers are very much sort after. Why because we are geniuses or just "nucking futs" according to the team owners :D 8) 8) 8) 8) 8)
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F1 car facts up to 5G'sunder brakes up to 4G's in a corner, from 200mph to a dead stop in 65m. Has 2.5 tons of down force, like driving around with a Landcruiser strapped to the roof. Over 100mph aero drag will slow the car faster than a Bugatti Veyron can brake. Has 25mm suspension travel, with half of that in the tyre wall. Has 80,000 individual components, if the car is assembled 99.9% correct 80 components won't be in the right place. Rattle guns for the wheels consume 20,000 litres of air per min.
Fastest corner Blanchimont at Spa taken at 190mph
(http://www.manipef1images.com/large/rbel2010pdk43.jpg)
(http://www.wired.com/wp-content/uploads/2014/05/Sauber-C33-steering-wheel.jpg)
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(http://www.wired.com/wp-content/uploads/2014/05/Sauber-C33-steering-wheel.jpg)
When do they find the time to play with any of those buttons at the speed they do?
It's not very clear which button is 'shuffle' for the CD player
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I can tolerate metres instead of yards, even though I get a brain warp occasionally with millimetres, I always had a problem with 2240 lb's in a ton, 1760 yards in a mile, rods, poles and perches in something or other.
What gets up my nose is the media changing the names of Australian railway stations into 'train stations' a stuff like that. Its not a f'en camel train!
I was always fascinated be maths and algebra at school but always got it wrong!
At least I don't spell socks 'SOX' or put the word FOR in front of FREE.
Am I todays 'Grump Master?
cheers Ol' pancho.
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When do they find the time to play with any of those buttons at the speed they do?
It's not very clear which button is 'shuffle' for the CD player
;D ;D Think there is only "PLAY" the PL button :D :D Maybe you have to hold down the 'shift' button as well ? Used to be able to hear the pit tell the driver to switch to whatever setting during races, not so much now they don't refuel.
For sheer speed and bang for buck not much can compare with the humble superkart. With over 100hp from the 250 twins and a big wing it drops lap times to around MotoGP levels
(http://coolmanstuff.files.wordpress.com/2010/01/250cc-superkart.jpg)
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Those superkarts must feel insanely fast to drive with them being so close to the ground & small
Read an article on the cost of parts for F1 cars a few years ago & the cost of that steering wheel would make your eyes water
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When do they find the time to play with any of those buttons at the speed they do?
It's not very clear which button is 'shuffle' for the CD player
;D ;D Think there is only "PLAY" the PL button :D :D Maybe you have to hold down the 'shift' button as well ? Used to be able to hear the pit tell the driver to switch to whatever setting during races, not so much now they don't refuel.
For sheer speed and bang for buck not much can compare with the humble superkart. With over 100hp from the 250 twins and a big wing it drops lap times to around MotoGP levels
(http://coolmanstuff.files.wordpress.com/2010/01/250cc-superkart.jpg)
Those supercarts are a hoot to watch.
They take the right angle corner at the end of the main straight at Morgan park race track [ Warwick ] without slowing down.
No backing off , no brakes .
Stunning stuff
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some good clips on youtube of super karts
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Jonathan Palmer talked a bit last night about the steering wheel settings, now given as codes to the driver over the radio, "H12B3C4" is what it sounds like rather a straight command. Interesting even to a ex F1 driver he said the the codes ( the even some settings had sub menus) were incredebly complex and even he didn't know how they can find the time to adjust the knobs.