1/4 Mile Sprints

[Sparky Bills]

Sorry people,
Didnt manage to make it over. :crybaby: , was Gutted!
How did it all go??
Who got fastest time? etc.. :Police:

[MOTOXXX]

haha
i knew you were talking it up at 4am thismorning saying "yea man ill be going"

im guessing u got up at 12 or something. i know i did.

[MD]

Ya big blouse Sparky- and we know what your new bike is !
I'll try and be modest but its hard because I'm absolutely blown away by today's runs on the blade. The early arrivals got wet riding over the hill but it quickly cleared.
Best news was Tony S didn't turn up, so us lesser mortals had a chance.
When I left after lunch I had the quickest flying at 5.13 secs (282kph) and best standing 1/4 at 10.02 secs but not sure what happened later. Don't care I'm rapt.
Poor Stonechucker was doing a flying run when some real bright spark and one of his mates on Harleys stop, then "cruise" around the road closed sign, between the cones and the official (he had a floro vest even) and ride straight towards SC! Put the shits up all of us watching. I think it was Mangel6 who leaped out and stopped the second bike but the first guy just rode on towards a bike closing on him at warp 1. Oblivious to the road closed signs, checked flags, timing gear, officials, cones, ambulance parked ahead, spectators along the bank. No this is cool, I can ride along here if I want, wonder why they stopped all the other vehicles back there? and why's this dude coming straight at me? Maybe I should do a U in front of him.
That's entertainment I guess.
MD

[jimbo600]

Ya big blouse Sparky- and we know what your new bike is !
I'll try and be modest but its hard because I'm absolutely blown away by today's runs on the blade. The early arrivals got wet riding over the hill but it quickly cleared.
Best news was Tony S didn't turn up, so us lesser mortals had a chance.
When I left after lunch I had the quickest flying at 5.13 secs (282kph) and best standing 1/4 at 10.02 secs but not sure what happened later. Don't care I'm rapt.
Poor Stonechucker was doing a flying run when some real bright spark and one of his mates on Harleys stop, then "cruise" around the road closed sign, between the cones and the official (he had a floro vest even) and ride straight towards SC! Put the shits up all of us watching. I think it was Mangel6 who leaped out and stopped the second bike but the first guy just rode on towards a bike closing on him at warp 1. Oblivious to the road closed signs, checked flags, timing gear, officials, cones, ambulance parked ahead, spectators along the bank. No this is cool, I can ride along here if I want, wonder why they stopped all the other vehicles back there? and why's this dude coming straight at me? Maybe I should do a U in front of him.
That's entertainment I guess.
MD

10:02 Standing?? I thought it was more like 10:08. Anyway good in anybodies language. The little 600 only managed 160mph. A black commodore mufti was lerking around towards the end of the day too. Passed it on the way home.

[Hitcher]

A black commodore mufti was lerking around towards the end of the day too.
Is that the one with the "Bodyworks" sticker on the rear bumper?

[jimbo600]

Is that the one with the "Bodyworks" sticker on the rear bumper?

Didn't see it from the rear. He pulled some cage over as I went past, at a rather gingerly pace I might ad.

[Sensei]

10.2 sec not bad . My 93 GSXR1100 did the same 10.2 over the 1/4 not bad for a 11y old bike . Cann't wait till my new GSXR1000 is in the shed .
SENSEI :yeah:

[Marknz]

good day out and good to catch up with a loada people. Big ups to Figjam from Akld who came down and has to be at work in Akld tomorrow morning for a meeting. Top effort that man.

Me and the 'Storm? 6.09 flying (237.83kph) and a 11.62 standing was my best. And they were the first runs of each discipline in the day. Either I was thinking too much about it in the other runs or the heat was playing with the mixture and affecting the speeds.

I'd be happy to get into the 5's with the flying, but don't think my clutch could handle a sub-11 standing... be worth a try though :)

Not sure who got the better of the un-official battle of the sports-touring V-twins, but it was good to see 4 or 5 'Storms there plus a SV1000. Although one bloke on a TL apparently told all and sundry he would kick our arses good and proper, and promptly left it parked up all day. Anyone we know?

Cheers

[Velox]

Yep - a good day out in the waps watching nice bikes and sitting in the sun! :niceone: There were some pretty good efforts by you guys that entered, and I saw my first Harley doing a wheelie! Good to meet you CNo6, don't know what other Kbers were there that I didn't already know. :sunny: :sunny: :sunny: Roads were perfect on the way back (apart from a bit of cow crap) but there were so many cars on the hill that it was just painfull!

[Sparky Bills]

Good to hear you all had fun,
Yeah I was going to go, and NO I did not sleep till 12! By the time I helped clean up after the party, It was going to be too late to get over there. BUGGER!!
We will be organising a MotoMart ride for early Dec.
Has always had a good turn out. Prob same as last year. Will keep you all posted :headbang:

[Blakamin]

We will be organising a MotoMart ride for early Dec.
Has always had a good turn out. Prob same as last year. Will keep you all posted :headbang:
woohooo, i think... (work weekends now :disapint: )
have you got your new bike?? might call in tomorrow if ya have...

[StoneChucker]

My flying time was 5.56 secs, which is 260.04km/h. My speedo read at the very end 290km/h. I've noticed people exclaiming that bikes overread so much, and they do, but that 260.04 is the average over the whole run, so you can't compare it to the top speed that you saw on the speedo.

For that, you would need someone with a radar gun at the finish line, and you would have to glance down at the speedo as you went past.

I also noticed, that I went about 5 km/h faster this time, from being about 3 kgs lighter. I can't wait for the next sprints, where I hope my bike/rider combo will be about 25kgs lighter! :first:

[Slingshot]

I didn't make it on the weekend but I was there last time. I too noticed a big difference between the speedo & the timed figure.

I clocked 227.3 kmph but the speedo was showing around 270 kmph. By the time I hit the start line on the flying 1/4 mile the bike was fully ringed out, I would have been lucky to accelerate more than 1 or 2 Ks between the start and finish lines.

My theory is this:

The faster you go the taller the tyre gets (the tyre gets hot, centra petal force pushes the rubber into a taller profile etc). The speedo is calibrated for a specific rubber diameter, this diameter will change depending on tyre pressure, weight, temperature, speed, etc and therefore the speedo can only ever be an indication of speed.

I think the general rule is the larger the rolling diameter of the tyre, the faster the speedo will read.

Not sure if the difference is as much as people have stated though.

[StoneChucker]

I'm still accelerating while going through the 1/4 mile, even at the end, which is a pity as it could go faster.

[Hitcher]

My theory is this:
centra petal force pushes the rubber into a taller profile etc
That would be centrifugal force. Centripetal force is the opposite effect that forces things towards the centre or axis.

[James Deuce]

Good to hear you all had fun,
Yeah I was going to go, and NO I did not sleep till 12! By the time I helped clean up after the party, It was going to be too late to get over there. BUGGER!!
We will be organising a MotoMart ride for early Dec.
Has always had a good turn out. Prob same as last year. Will keep you all posted :headbang:
May I come along too please?

I picked my bike up from Motomart, if that helps. :)

[Hitcher]

We will be organising a MotoMart ride for early Dec.
I suppose given all of the nice things I have to say about Motomart I had better make other plans...

[Slingshot]

That would be centrifugal force. Centripetal force is the opposite effect that forces things towards the centre or axis.
Centrifugal force is a myth, I remember back from my days of rotational physics.
I'll see if I can dig out my old text books so I can explain why it's a myth.

[Hoon]

I think the general rule is the larger the rolling diameter of the tyre, the faster the speedo will read.

No the larger the the tyre becomes, the lower speed your speedo will read (for a given speed). Also depends on whether the speedo is front or rear wheel driven.

For some reason most bikes speedos are horribly inaccurate above 200kph by about 50kph. Tyre flex isn't to blame as you are talking about a 20% error which means a tyre would have to grow/shrink about 12cm in diameter. When people tell me they were doing 290kph the other day and I know that model is only good for 260kph, I do a mental calculation and go "so that actually means 240 REAL kph" but just keep it to myself :)

[Hitcher]

Centrifugal force is a myth, I remember back from my days of rotational physics.
I'll see if I can dig out my old text books so I can explain why it's a myth.
I'm sure all riders who have highsided would be fascinated to learn that centrifugal force is a myth...

However your are right in your assertion. Centrifugal force does not exist. Nevertheless, it appears real to the object being rotated. This is because the object believes that it is in a non-accelerating situation, when it is not. For instance, a child on a merry-go-round is not experiencing any real force outward, but they must exert a force inwards to keep from flying off the merry-go-round. Since the centrifugal force appears so real, it is often very useful to use as if it were real. The more massive the object, the greater the force. This is true because an adult will have a harder time staying on a merry-go-round than will a child. The greater the speed of the object, the greater the force. This is true because a merry-go-round is harder to stay on, the faster it is pushed. The less distance from the centre, the greater the force. This is perhaps the trickiest relationship, for it is much harder to stay near the middle of the merry-go-round than the edge of the merry-go-round.

[jrandom]

...

...

...

...

[James Deuce]

No the larger the the tyre becomes, the lower speed your speedo will read (for a given speed). Also depends on whether the speedo is front or rear wheel driven.

For some reason most bikes speedos are horribly inaccurate above 200kph by about 50kph. Tyre flex isn't to blame as you are talking about a 20% error which means a tyre would have to grow about 12cm in diameter. When people tell me they were doing 290kph the other day and I know that model is only good for 260kph, I do a mental calculation and go "so that actually means 240 REAL kph" but just keep it to myself :)

The only bike I've owned with a reasonably accurate speedo was my RC30. Indicated 275=260 on a radar gun.

I never want to go that fast again. I sat up at 200km/hr because it felt slow. My arms grew about 6cm, and I bruised my tail bone on the seat hump.

Sorry about being the old fart going on about the glory days.

Sigh.

Sad old git ...

[James Deuce]

This is perhaps the trickiest relationship, for it is much harder to stay near the middle of the merry-go-round than the edge of the merry-go-round.

The coolest merry go round I've ever seen was the one Above-Bar in Southampton. As we got closer to the amusement rides, I could hear the unmistakable sound of a Chevy small-block V8 turning at about 5000rpm.

The merry go round was 4 rides deep, and populated by white faced small children clinging on for grim death to various horses and unicorns, and by Grannies sagging at the knees with cheeks stretched flat over facial bones and teeth bared, just like all those comedy centrifuge gags.

There was a perceptible breeeze coming off the merry go round some 20 metres away, and the open pipes of that Chevy V8 drowned out the cheesy music wonderfully.

The wife and I had many hours of sublime entertainment listening to the "Dopplered" screams of terrified toddlers.

Marvellous.

[Sparky Bills]

I suppose given all of the nice things I have to say about Motomart I had better make other plans...

Mate..
I dont really care.
A ride is a ride! Come along! :scooter:
If you really feel that badly towards us, then so be it. But really.. I would'nt mind at all.

[MOTOXXX]

:Playnice:

[Sparky Bills]

Bring it on Motoxxx!! :finger:
Check out the events!! The ride info is posted up there! :scooter: :headbang:

[James Deuce]

Bring it on Motoxxx!! :finger:
Check out the events!! The ride info is posted up there! :scooter: :headbang:

I know where Hitcher is coming from.

I couldn't get service there even though I had picked out a bike, Helmet, Boots, and Gloves. I asked and asked for help, and no one actually spoke to me except to say that someone would be with me in a minute. After an hour I flagged it.

What kind of business gives up 10 grand worth of business?

The very TRX I'd been looking at ended up at Bay City Motorcycles and I bought it from them, for a great price, and I had excellent service from them too.

[onearmedbandit]

No the larger the the tyre becomes, the lower speed your speedo will read (for a given speed). Also depends on whether the speedo is front or rear wheel driven.

For some reason most bikes speedos are horribly inaccurate above 200kph by about 50kph. Tyre flex isn't to blame as you are talking about a 20% error which means a tyre would have to grow/shrink about 12cm in diameter. When people tell me they were doing 290kph the other day and I know that model is only good for 260kph, I do a mental calculation and go "so that actually means 240 REAL kph" but just keep it to myself :)

Where did you get this info from? I have seen numerous tests where indicated is, for example, 274km/h and real has been 271km/h. Hardly a 50km/h difference. Check most good mags, they will show indicated to real speed comparisons, and I bet you you'll never find a 50km/h difference. I'd be sending my bike back to the factory if that was the case.

[Sparky Bills]

I dont want to get into all that again! :calm:
Cant we all just get along :crybaby:
Just come to the ride, and we can all have a good time! :niceone:

[onearmedbandit]

I can understand your sentiments Sparky Bills, but I'm not having a go at Hoon, just asking where he got his info from. Anyway, you don't have to get involved if you don't want to.

[sAsLEX]

. The less distance from the centre, the greater the force. This is perhaps the trickiest relationship, for it is much harder to stay near the middle of the merry-go-round than the edge of the merry-go-round.


ahem, pulls trusty 7th form physics book again from the depths of darkness


Fc=(m*v^2)/r ie mass times velocity squared over the radius gives centripetal force

Velocity is a linear measure therefore v=r*w(funny greek w)
w(funny greek w)=2*PI*f(frequency) 360RPM=6Hz

so back to origanal equation after playing with some letters

Fc=m*r*w^2.here radius a multiplier the force increases the further you get out for a set rotational speed such as in a merry go around

[Jamezo]

I'm sure all riders who have highsided would be fascinated to learn that centrifugal force is a myth...

However your are right in your assertion. Centrifugal force does not exist. Nevertheless, it appears real to the object being rotated. This is because the object believes that it is in a non-accelerating situation, when it is not. For instance, a child on a merry-go-round is not experiencing any real force outward, but they must exert a force inwards to keep from flying off the merry-go-round. Since the centrifugal force appears so real, it is often very useful to use as if it were real. The more massive the object, the greater the force. This is true because an adult will have a harder time staying on a merry-go-round than will a child. The greater the speed of the object, the greater the force. This is true because a merry-go-round is harder to stay on, the faster it is pushed. The less distance from the centre, the greater the force. This is perhaps the trickiest relationship, for it is much harder to stay near the middle of the merry-go-round than the edge of the merry-go-round.

hmm, the acceleration of the adult and child will be equal, I don't see why an adult will have a harder time staying on, unless you are implying that this adult does not have strength proportional to their mass, relative to the child.

if you have personally experienced this, this effect might be explained by your higher center of gravity, that's the only reason I can surmise for an adult having any worse ability to stay on a merry-go-round.

[Jamezo]

ahem, pulls trusty 7th form physics book again from the depths of darkness


Fc=(m*v^2)/r ie mass times velocity squared over the radius gives centripetal force

Velocity is a linear measure therefore v=r*w(funny greek w)
w(funny greek w)=2*PI*f(frequency) 360RPM=6Hz

so back to origanal equation after playing with some letters

Fc=m*r*w^2.here radius a multiplier the force increases the further you get out for a set rotational speed such as in a merry go around

your own equation belies you, you stated before, v=r*w, therefore w=v/r

increasing the radius decreases the value of w, and since in your next equation, Fc=m*r*w^2, the w is raised to the power of 2, it has more effect on the force than the radius alone. increasing the radius decreases the force.

yousa needa ride some more roundbouts!

[mangell6]

I remember this being taught and I thought then as I do now, I'll never use this in real life.

Mike

BTW It was me who stopped the Harley Rider.

[matthewt]

I'm still accelerating while going through the 1/4 mile, even at the end, which is a pity as it could go faster.

If you guys were still accelerating on the run then you should of started further back. When TonyS broke 5 seconds that's exactly what he did. He started back by the barrage gates and was probably doing 160 by the time he went past the starting point.

Anyway well done to all.

My effort was 222k (best of 2 runs) on the flying and 11.43 (only 1 run) on the standing. Last year my F4 did 248k and 11.30 so I'm happy with the results.

[matthewt]

I suppose given all of the nice things I have to say about Motomart I had better make other plans...

Do you need me to hold your hand :cool:

Seriously, though you should come along anyway. Besides Sparky Bills is probably the only one on this site and we could both take him :sly:

[mangell6]

I did notice that I was going faster just before the end than I was just before the beginning. Should see if I can get the extra 8kph and start furthe back next year. I am ecstatic with my standing ¼ 11.17 and 233.99k on the flying, my speedo nearly reached 240kmh.

[MD]

I remember this being taught and I thought then as I do now, I'll never use this in real life.

Mike

BTW It was me who stopped the Harley Rider.

YOU REMEMBER STUDYING THIS ! My brain is like an iron clad vault, information goes in and it is bagged, tagged and securely filed away. I just can't remember where I put the key?
Mangell6 I got it right on my earlier post. I said it was you who stopped the Harley. Well done.
Speedo error. For what it's worth I was reading 299 just as I reached the first timer and each run averaged 281 point something. So that's not too far out at 6%, although the speedo is limited at 299 (thanks to corporate social responsibility) so maybe it would have misread higher if allowed.
That black Commodore was there when we 'gently' rode past going home too. I'm sure he gave us the evil eye - why the hell are you Guys riding at 102kph ! :innocent: :Police:
MD

[Sparky Bills]

Thats not bad for a naked bike!
Did you feel like you were going to fly off the back like a parachute?

And if people were still accelerating at the end...
You should play with gearing. When would you be-able to use all the power if it takes ages to get up to full speed?
The faster you get there the better!
Makes for good wheelies too!

[Sparky Bills]

You have to catch me first Matty! :devil2:
But your right!
EVERYONE MUST COME!!

[jimbo600]

YOU REMEMBER STUDYING THIS ! My brain is like an iron clad vault, information goes in and it is bagged, tagged and securely filed away. I just can't remember where I put the key?
Mangell6 I got it right on my earlier post. I said it was you who stopped the Harley. Well done.
Speedo error. For what it's worth I was reading 299 just as I reached the first timer and each run averaged 281 point something. So that's not too far out at 6%, although the speedo is limited at 299 (thanks to corporate social responsibility) so maybe it would have misread higher if allowed.
That black Commodore was there when we 'gently' rode past going home too. I'm sure he gave us the evil eye - why the hell are you Guys riding at 102kph ! :innocent: :Police:
MD

Was the mufti still on the main drag between Martinborough and Featherston or did he infiltrate towards the East West access rd?

[Velox]

BTW It was me who stopped the Harley Rider.
What did he/she/it have to say for themselves? Did they really not realise???

[StoneChucker]

You should play with gearing. When would you be-able to use all the power if it takes ages to get up to full speed?
The faster you get there the better!
Makes for good wheelies too!
How do you fiddle with the gearing?

And, will they let us start further back? You would have to zip through the cones at high speed?..?

Mangell6, thanks for stopping the harley rider. I would have loved to know what the rider I passed was thinking. Next year the Marshalls should carry rifles, and shoot to kill any would be dicers! :calm:

NOW, I HAVE a question. Why do the "Mark Dunn's" of KB go 281, and I only crack 260 (average of 1/4 mile). Is it just the extra say 30kgs I'm carrying, in, err, "fuel"? Will loosing this "fuel" get me up there with the "big boys", or do I have to fork out for exhausts, PC3, de-restricting kits, etc...... :mad:

[Velox]

NOW, I HAVE a question. Why do the "Mark Dunn's" of KB go 281, and I only crack 260 (average of 1/4 mile). Is it just the extra say 30kgs I'm carrying, in, err, "fuel"? Will loosing this "fuel" get me up there with the "big boys", or do I have to fork out for exhausts, PC3, de-restricting kits, etc...... :mad:
Nah - you just have to get a Honda.

[StoneChucker]

get a honda
Today starts your 1 month of the silent treatment :blank:

[Velox]

Today starts your 1 month of the silent treatment :blank:
You're probably right to have a bit of a 'quiet time' - sometimes the truth hurts and the best thing to do is just to sit back and have a bit of a time to think.

[Mr Skid]

Today starts your 1 month of the silent treatment :blank:

Don't worry, I'm sure you'll get a reasonable trade on a cbr thou' :Pokey:

[StoneChucker]

I said no, and I mean no! Respect my Authoritai! - Eric Cartman :first:

Hey, listen, if you make a turd travel at 300, must everyone go out and sit on a turd? hahahahahaha

:Playnice: It was a toss up for me between the 4 litre bikes. The looks of "The One" got me in the end.

[James Deuce]

I wonder if Mr Hanky the Christmas Poo can do 300.

Pity you ended up with that somewhat derogatory appellation of "Stonechucker" mate. I reckon Cartman suits you HEAPS better.

Nyah, nyah, nyah, nyah, nyaaah, nya.
I made you eat your paarents.

[MD]

Nah - you just have to get a Honda.
Right on Velox !
I hear Aaron got a good time after I left on his CBR1 and he's built like the proverbial brick shit house and hasn't had the bike long. He weighs a lot more than me. Its all a bit irrevelant once you can go above 230 odd that's all you can use in most race situations (track stuff I mean, not on the road). Like the rest of you I was just curious to see what happens at full tit. If I do it again I'll use Tony's trick and start 100m back, I reckon that's what we all needed.

Jimbo, yeah that mufti was in the tree shadows between Fearthers and Mtbrh, just sth of the tight left-right bridge. He's been hanging there a bit lately.
MD

[Velox]

Right on Velox !
I hear Aaron got a good time after I left on his CBR1 and he's built like the perverbial brick shit house and hasn't had the bike long. He weighs a lot more than me. Its all a bit irrevelant once you can go above 230 odd that's all you can use in most race situations (track stuff I mean, not on the road). Like the rest of you I was just curious to see what happens at full tit. If I do it again I'll use Tony's trick and start 100m back, I reckon that's what we all needed.


Yeah - he seemed pretty happy with his runs but reckoned your pipe made you go quite a bit faster too. Interesting though eh with the two identical bikes - bit of case study for the effects of pipes or rider weight. Oh, or skill I guess. Ok - that's actually quite a few varialbles.

[sAsLEX]

your own equation belies you, you stated before, v=r*w, therefore w=v/r

increasing the radius decreases the value of w, and since in your next equation, Fc=m*r*w^2, the w is raised to the power of 2, it has more effect on the force than the radius alone. increasing the radius decreases the force.

yousa needa ride some more roundbouts!

is w not constant for a set rotational speed through w=2*PI*f though

not my field just thought it would be harder to hold at the circumference since through v=r*w you would be moving faster, but as you said it does look like i made an error

[mangell6]

Thats not bad for a naked bike!
Did you feel like you were going to fly off the back like a parachute?

And if people were still accelerating at the end...
You should play with gearing. When would you be-able to use all the power if it takes ages to get up to full speed?
The faster you get there the better!
Makes for good wheelies too!

The front was feeling light at that speed, had 1000revs to red line in top, so I was nearly there. Would not have liked to do the flying with any sort of cross wind.

Mike

[mangell6]

What did he/she/it have to say for themselves? Did they really not realise???

The Harley guy did not realise and quickly moved to the left hand side, don't know about his mate.

Stoney - Not a problem, been a marshall before really should have two, one to keep ALL the traffic, including bikes, behind the marker signs and the other for lookout.

Mike

PS There was a thread that mentioned the weight/speed ratio. Basically the heavier you are the slower you will go.

[Hitcher]

Basically the heavier you are the slower you will go.
You destroyer of fond dreams...

[sAsLEX]

must be why the like of rossi and sudeep are so fast!

[Sparky Bills]

Yeah thatll be why.
Im sorry to say im too heavy to be in GP, Im 85kg, and over 6ft..
So had to turn Repsol Hond down. Much to their discuss. :yeah:
Look at the top Gp racers..
Most of them are tiny little guys, Who needs fairing when your that small and light?? :angry2:

[mangell6]

You destroyer of fond dreams...

Oh no not yet, I now know how to beat that person who has a slightly tuned 748.

The Solution (http://www.yamahafz1oa.com/forum/showthread.php?s=&threadid=18243)


He he he he he he

I wonder if I can figure out how to convince someone?

[Hitcher]

Yeah thatll be why.
Im sorry to say im too heavy to be in GP, Im 85kg, and over 6ft..
So had to turn Repsol Hond down. Much to their discuss. :yeah:
Look at the top Gp racers..
Most of them are tiny little guys, Who needs fairing when your that small and light??
[Another hard day at work for Mr Ellipsis]: ' ' ' Honda disgust P you're

[Hitcher]

Yeah thatll be why.
Im sorry to say im too heavy to be in GP, Im 85kg, and over 6ft..
So had to turn Repsol Hond down. Much to their discuss. :yeah:
Look at the top Gp racers..
Most of them are tiny little guys, Who needs fairing when your that small and light??
[Another hard day at work for Mr Ellipsis]: ' ' ' Honda disgust P a you're

[Sparky Bills]

Give me a break! I was in a rush. :2thumbsup