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Author Topic: LC8 - How fast?  (Read 3649 times)

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Offline LuckyStriker

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Re: LC8 - How fast?
« Reply #40 on: January 23, 2008, 02:09:50 pm »
in a world without friction that would be true
 

Offline topbox

Re: LC8 - How fast?
« Reply #41 on: January 23, 2008, 02:13:55 pm »
Done 215km/h on tar, with pillion 202, stupid though, but sometimes can't help it!!!
Weight relevant, pillion weighs 57kg and can feel it clearly!!!


Show us you're pillion....not many 57kg's around, must be hot! ;D


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Offline LostDOG

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Re: LC8 - How fast?
« Reply #42 on: January 23, 2008, 02:18:27 pm »
as mentioned accelration is a factor of weight
top speed is not ...

assuming 2 riders have the same body propertions but the one weights 150 kg and the other 45 kg , they will experience the same top speed on a given bike.

this is science ...

All bodies have different terminal velocities based on their aerodynamic properties, mass x acceleration needs to overcome opposite force due to wind resistance (which also increases with an increase in speed), thus blah blah blah, ...
NOW I truly give up.
Kalahari.net have a few science text books on offer, pick one, any one.
It's a friggen motorcycle, it's not supposed to be comfortable, quiet or safe. The windnoise is supposed to hurt your ears, the seat should be hard and riding it should make you shit your pants every now and then. Suck it up. -- Scary Gary MC
 

Offline MrBig

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Re: LC8 - How fast?
« Reply #43 on: January 23, 2008, 02:35:59 pm »
Done 215km/h on tar, with pillion 202, stupid though, but sometimes can't help it!!!
Weight relevant, pillion weighs 57kg and can feel it clearly!!!


Show us you're pillion....not many 57kg's around, must be hot! ;D


:useless:

So easily distracted  ::)


Mind you, if you call my pillion 57kg she'll bliksem you.
Chicks mos weigh a lot less than we think.
And even if they don't they do. Getit?
I'm like 2.25x my pillions weight  :o

Bottom line >> some bikes fucks off,  my bike kaks off.
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Re: LC8 - How fast?
« Reply #44 on: January 23, 2008, 02:38:01 pm »
as mentioned accelration is a factor of weight
top speed is not ...

assuming 2 riders have the same body propertions but the one weights 150 kg and the other 45 kg , they will experience the same top speed on a given bike.

this is science ...

All bodies have different terminal velocities based on their aerodynamic properties, mass x acceleration needs to overcome opposite force due to wind resistance (which also increases with an increase in speed), thus blah blah blah, ...
NOW I truly give up.
Kalahari.net have a few science text books on offer, pick one, any one.


i suggest you read one ...

the only real effect weight would have is to increase resistance of tyres on the road or on bearings(negligible) ..of course the aerodynamic caused by a "larger" body ...not the weight itself ...

lets take bike A it weighs 300kg has a 100kg bar under the seat which does nto affect airodynamics and has a top speed of 200km/h on a level road at sea level with rider joe soap on it.

take out said 100kg bar an redo test ...while i agree acceleration will be greatly affected top speed will not be .....

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Offline LuckyStriker

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Re: LC8 - How fast?
« Reply #45 on: January 23, 2008, 02:48:44 pm »
To move extra mass you need create and spend more energy
so to reach a maximum top speed with extra weight you will burn more fuel

theoretically both bikes (one heavy, one light) will be able to reach the same max speed but the heavier one will take longer to get there.
But these conditions only work in the vacuum of space. Here on earth we have to overcome gravity, drag and resistance
 

Offline NISMARK

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Re: LC8 - How fast?
« Reply #46 on: January 23, 2008, 03:14:53 pm »
So Uil wat was jou spoed of is jy skaam?!? ;D
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Re: LC8 - How fast?
« Reply #47 on: January 23, 2008, 03:30:01 pm »
The only adverse affect wieght has on top speed is increased rolling resistance on wheels an bearings ..no more ... (an this affect is tiny when talking bout 100 or 150 kg's)

the ramifications of weight , ie extra surface area, higher CD would certainly affect top speed...

Aerodynamics is the big inhibitor of top speed , not weight ..

Couple of years ago on dstv there was a program about this top speed project  (british project)being run at the salt flats ... the chief engineer of the project was stating that he was in fact going to make the vehicle a lot heavier to prevent it taking off.... the logical question was asked" but wont that affect top speed (as instinctively one would think it does)?

he went thru a lenghty reply mentioning the increased rolling resistance on wheels an bearings but then said this was insignificant and top end on the vehicle would be the same, it would take a huge amount of wight to make any sort of real difference. I did not believe this and started researching it until it dawned on me that indeed the engineer was correct.

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Offline LuckyStriker

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Re: LC8 - How fast?
« Reply #48 on: January 23, 2008, 03:42:44 pm »
Well okay then. If you saw it on TV then it must be true ;D

but seriously, I will research it too and if you are correct then I thank you for making me just a little bit cleverer than I already think I am ;)
 

Offline Uiltjie

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Re: LC8 - How fast?
« Reply #49 on: January 23, 2008, 04:04:39 pm »
So Uil wat was jou spoed of is jy skaam?!? ;D

Lees die hele thread, ek het al gesĂȘ, en ja, ek is bietjie skaam daaroor, want dis stadiger as Jabu en dis nog steeds gevaarlik vinnig..... ;D

Troos jouself, ek dink die Vara is vinniger, ek het mos een gehad.  Ek het hom net tot 197 GPS gevat, maar hy kon nog gaan. :o
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Offline LuckyStriker

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Re: LC8 - How fast?
« Reply #50 on: January 23, 2008, 04:58:24 pm »
The only adverse affect wieght has on top speed is increased rolling resistance on wheels an bearings ..no more ... (an this affect is tiny when talking bout 100 or 150 kg's)

the ramifications of weight , ie extra surface area, higher CD would certainly affect top speed...

Aerodynamics is the big inhibitor of top speed , not weight ..

I did a bit of googling and discovered you are probably right
there seems to be a consensus that weight accounts for less than 10% of the effect that aerodynamics, etc has.
In short; weight does affect top speed but on a bike or car it is negligible (like cm/h difference)

You are correct sir. Extra weight on a bike won't slow it down at all, only cause it to accelerate slower
 

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Re: LC8 - How fast?
« Reply #51 on: January 23, 2008, 05:07:59 pm »
dif between GPS and clock about 9km/h faster on the clock, at 201 on the GPS.
 

Offline michnus

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Re: LC8 - How fast?
« Reply #52 on: January 23, 2008, 06:31:10 pm »
Only got to 215 on the 1200, fiddled with the canbus got the 215 restrictor off, tops out at 225 GPS.

Offline Uiltjie

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Re: LC8 - How fast?
« Reply #53 on: January 23, 2008, 08:03:04 pm »
Only got to 215 on the 1200, fiddled with the canbus got the 215 restrictor off, tops out at 225 GPS.

Dis moer vinnig!  :o :o :o :o

Michnus, stadig ou maat, ek wil jou nog ontmoet!  Maar dis fokken lekker ne? ;D
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Offline michnus

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Re: LC8 - How fast?
« Reply #54 on: January 23, 2008, 08:18:03 pm »
Hang af hoe ek die een pyp van die Canbus met my vingers toeknyp kan ek self 235km/h kry.....en dan Uil........ry ek al julle KTM's in julle se moer.   >:D

 ;D ;D ;D

Offline JourneyMan

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Re: LC8 - How fast?
« Reply #55 on: January 23, 2008, 08:32:13 pm »
..and Michnus is big boned. Seems to to support ICm's theory. :mrgreen:
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Offline michnus

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Re: LC8 - How fast?
« Reply #56 on: January 23, 2008, 08:42:55 pm »
You won't believe how thin I get myself behind that screen.  ;D

Offline Uiltjie

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Re: LC8 - How fast?
« Reply #57 on: January 23, 2008, 08:48:32 pm »
Hang af hoe ek die een pyp van die Canbus met my vingers toeknyp kan ek self 235km/h kry.....en dan Uil........ry ek al julle KTM's in julle se moer.   >:D

 ;D ;D ;D

Hey, moenie met jou brand bashing kak begin nie! >:D  Jy weet wat kan gebeur - the great exodus!

Maar heelaas, dis waar!
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Offline LostDOG

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Re: LC8 - How fast?
« Reply #58 on: January 23, 2008, 08:49:45 pm »
Consider this, my final submission on this matter. I agree that weight probably plays less of a role whilst rolling at a constant speed. As said, it's the getting to the constant speed that counts. For someone setting a landspeed record with a specific aerodynamically designed car, weight at top speed is a small consideration, although, longer track to get to top speed, more fuel, etc become issues.

In the context of riding bikes. My mate frankie weights 82kg (small farker) I am a healthy 116kg (goodlooking hunk of a male). I stand probably 5 inches higher and wider across the shoulders than him. So I present a decent wind resistant obstacle. In the technical stuff I kick his ass!  ;) Whilst high-tailing at cruising speed, say 160, and we open up together, he gets to 190 long before me. By the time I get there he's 5 bike lengths ahead of me - which sucks.
So, ICM you're right  >:(. But I still needed more energy, fuel, and ducking onto tankbags to get me in a region close enough to smell he's fumes.
So, my perception is that he's bikes faster / stronger. In a racing scenario, weight makes a HUGE difference.
« Last Edit: January 24, 2008, 07:42:02 am by LostDOG »
It's a friggen motorcycle, it's not supposed to be comfortable, quiet or safe. The windnoise is supposed to hurt your ears, the seat should be hard and riding it should make you shit your pants every now and then. Suck it up. -- Scary Gary MC
 

Offline michnus

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Re: LC8 - How fast?
« Reply #59 on: January 23, 2008, 08:55:13 pm »
Hang af hoe ek die een pyp van die Canbus met my vingers toeknyp kan ek self 235km/h kry.....en dan Uil........ry ek al julle KTM's in julle se moer.   >:D

 ;D ;D ;D

Hey, moenie met jou brand bashing kak begin nie! >:D  Jy weet wat kan gebeur - the great exodus!

Maar heelaas, dis waar!

Nope eks nie so seker die 1200 is vinniger nie, die 1200 se govender ( whatever jy dit noem) skop in teen 200/205km/h

Lostdog if you keep your bike in 5th it might help, most bikes in 6th can't keep momentum as it's more a cruising gear, you will actually get a higher top speed in 5th than in 6th.