Buell Top Speed :-)

[maybebuell]

well dont forget wind resistance most probably all will stop before there max rpm in top gear

 

[1001yos]

Physically speaking

Ek = ((1/2)m)v^2

Ek = kinetic energy (joules)
m = mass in kilograms (rider + bike)
v = velocity in meters per second

adding or taking away weight won't contribute to any substantial acceleration or top speed since the Ek is proportional to half of the weight. What makes the major difference is the velocity since it is an arithmatic progression (exponential progression) The key is to reduce the speed of the wind (tucking in creates shorter path of wind) or increase the top speed of the pistons (blow your motor)

Top speed is like Limbo. A nice place to visit, but a place you never want to stay at.

 

[horseplay]

I havent read through all of these posts. Did anyone mention "true speed" versus "indicated speed"

Theres no doubt in my mind that if a Buell can reach a true speed of 135 mph that the speedometer may ACTUALLY read 150+mph.

There is sooo much error in motorcycle speedometers at higher speeds its ridiculous. Especially with variables like tire wear.... 10% error in speedometers on bikes is actually low


(I read the first couple pages and Im responding to that...sorry if Im off subject)

 

[GatorBuell]

I havent read through all of these posts. Did anyone mention "true speed" versus "indicated speed"

Theres no doubt in my mind that if a Buell can reach a true speed of 135 mph that the speedometer may ACTUALLY read 150+mph.

There is sooo much error in motorcycle speedometers at higher speeds its ridiculous. Especially with variables like tire wear.... 10% error in speedometers on bikes is actually low


I was just about to say the same thing.


(I read the first couple pages and Im responding to that...sorry if Im off subject)

 

[maybebuell]

horse good point i was told speedos on motorcycles are off 10 15 percent over 1000 mph buells get no wherer close to 140 ...just think what there speed is in a quarter mile and that at redline in 4th gear maybe 110 112 mph.....so 5th is no way going to pull another 30 mph

 

[driftingswiftly]

1001yos, you were close with your lecture on the physics of a buell, but not quite right. This system has nothing to do with energy. Yes, it has kinetic energy, but kinematics and dynamics are what determine the potential for top speed. In short, drag is the dominant force to be overcome.

Drag = - .5*roe*Cd*A*v^2 where roe is the density of air, Cd is the scalar coefficient of drag, A is the reference crossectional area, and v is the true velocity of your XB.

Weight has NOTHING to do with top speed, only acceleration. Given a long enough straight away, and identical conditions, every person on this forum will eventually reach the same speed. Tucking (reducing the crossectional area) is the only thing that you can to do actively alter a given bike's top speed.

Of course there are a myriad of minor affects that weight will come into play for, but these are a difference of 1 or 2 mph, not the decades you are all talking about.

In short, this should be modeled with force balances, not energy balances, and accordingly, weight plays no role in the dominant contributions.

 

[onelogue]

Drag = - .5*roe*Cd*A*v^2 where roe is the density of air, Cd is the scalar coefficient of drag, A is the reference crossectional area, and v is the true velocity of your XB.

Weight has NOTHING to do with top speed, only acceleration. Given a long enough straight away, and identical conditions, every person on this forum will eventually reach the same speed. Tucking (reducing the crossectional area) is the only thing that you can to do actively alter a given bike's top speed.

Hey drifting swiftly, what about friction between tire and road or are you assuming it's in the same for all bikes in this case. Also wouldn't you have to concider wind resistence, or is that part of the coefficient of drag?

 

[driftingswiftly]

Wind resistance is part of the true velocity. It is not taken with respect to the ground, but the surrounding air. And friction b/w the road and tire does not affect it b/c they are not moving with respect to each other (that is the point of contact of the tire with the road).

 

[onelogue]

Velocity = distance/time. In your equation, velocity is just standard (ignoring wind resistance) wind resistence has to come into place somewhere.

 

[driftingswiftly]

Drag is wind resistance....in a sense that is the only thing that comes in.

 

[Furball]

Die thread DIE!

 

[Buell_Cru]

Heres how fast your Buell is,

Weight: Speed:
150 140
160 139
170 138
180 136
190 135
200 134
210 133
220 132
230 131
240 130

THE END!!!!!!

 

[driftingswiftly]

this empirical?

 

[1001yos]

to drifting swiftly

As far as I'm concerned, The thread just started as soon as you (we?) posted

 

[driftingswiftly]

Haha I agree!

 

[xtremelow]

I have had my bike up to 300mph multiple times......

Some of these speeds are a joke. I highly doubt a stock bottom end or geared Buell can do 160mph, they are just not designed for straight line speed.

 

[xtremelow]

Oh, also wish for the thread to die before the 7th page although I just added fuel to the fire.

Highjack????

 

[Stevenc150]

This Thread =

 

[zoedogg1]

Zzzzz Zzzzzz Zzzzzz

 

[onelogue]

lol Stevenc150 I couldn't agree with you more!!!
Lets forward this thread to the Jap bike forums