gsferrari
Registered
This is understandable. The Busa was designed to ride in headwinds...not crosswinds. Look at the side profile - HUGE!!
Even the multi-million dollar F1 cars are CRAP when you have cross-winds. Read the race weekend reports from the "British GP at Silverstone" and look for the part where they talk about the section of track just before and into the entry of the "Bridge" curve.
Image:
Crosswinds are a HUGE problem here and the cars are twitchy on entry.
I cannot believe "educated" people have been arguing about "Aerodynamics" without understand the following points:
* What was the design focus for the Hayabusa aerodynamicist?
* What happens when you have cross winds and a large profile with no through-holes (Busa) ?
* What happens when you have crosswinds and a small profile with more through-holes (liter bikes)
Now I dont know about performance figures etc. but here is a little education about bike stability under different conditions:
Weight and CG:
CG : Center of Gravity.
If the weight is placed higher on the bike then you have a "top-heavy" bike. Fine in a straight line but once you start to "lean" the bike then you will be at a disadvantage. Think of it like this:
Take a 20 lb dumbell and tie a stick to it's handle so that the dumbell is like the handle of a sword and the stick is the blade of the swird. Now hold the "sword" by the handle and swish it around...feel ok? Good.
Take the same "sword" and hold it by the blade (the stick). Now keep it vertical and move it up and down...(so that the dumbell is moving ONLY in the vertical axis. Feels fine? Good...
Now try to swish it around like you did when it was reversed. Feels fine?
Again...does it feel ok? easy?
I hope that explains what I am trying to say about the weight distribution in the vertical axis...and the center of gravity.
Center of gravity of these bikes is affected by:
* rider weight
* fuel tank : fuel levels and tank positioning
* weight distribution of the bike without the rider
It is considered ideal to keep the CG as LOW as possible on the vertical axis. How you position the CG in the horizontal axis (along the bike's length) will affect handling without impairing stability too much.
Harsh bumps are transmitted to the rider more so on the lightweights but have noticeably less effect on the overall stability and shake.[/QUOTE]
This is just a measure of the performance of the suspension. I think you are wrong with this one - if the suspension is transmitting the bumps to the rider then it is CLEARLY not doing it's job. A harsh bump could mean a foot slipping off the pegs, jab on the front brakes by accident, roll throttle abruptly...
None of which are "pleasant" scenarios. A heavier bike with a well set-up suspension will absorb these bumps in a straight line. Cornering wont be as acute as the literbikes but that is clearly not the design focus of the Busa so it is a moot point. I know for a fact that modern liter bikes will run rings around the Busa on twisties.
If you have ever come close to dragging your knee around a corner on a Busa, you know that the bike has a tendency to wobble and in some cases, quite violently -- enough to scare the living crap outta you[/QUOTE]
Read the "dumbell stick sword" analogy.
Shifting hard at 10K under full throttle on the Busa, I get some rather interesting TQ steer and again on the 1000's, much less so...[/QUOTE]
Time to get your wheel alignment checked and your wheel/tyres balanced. These are the only conditions under which you will experience throttle steer on a motorcycle. This is dangerous sh!t...especially if you do track days. Get it checked before you take a spill...
Unless there's a fantastic concept of torque steer on bikes that's different than the one that does and can only apply to front wheel driven (and to a lesser extent, all wheel driven) cars, I'm done listening to you.[/QUOTE]
Torque Steer is a physical phenomenon. What he is experiencing is just a mechanical maladjustment. Thankfully MSF teaches riders to apply front brakes AND rear brakes at the same time. Applying rear brakes ONLY on a bike with an alignment issue is a recipe for disaster...
I know...I own a 1962 Royal Enfield Bullet 350cc bike with rear wheel alignment sprockets. That bike had no front brakes (it had the hardware but the bike was waaaay too heavy to stop with those measly drum brakes) and I used ONLY the rear brakes on it for several years...never crashed - came close on several occasions...had 10 foot skids because of bad alignment and tyre balancing...
But I never crashed.
Bring on the wobbly busa
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