Haybusa Parts and Service Member Support

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1
DRAG RACING / Re: Set up for an old Gen I
« Last post by Gerald on December 02, 2021, 09:51:43 PM »
Hey John, at stock length 16/40 gearing works pretty good. Great for street and strip. If it's just going to be a strip bike only you could get more aggressive with the gearing. Any Shinko is good, the Stealth is great street and strip, the Hook-up PRO is a great strip tire, ok on the street. Tire pressures always depended on track conditions, anywhere from under 15 psi to 25-30+. Aftermarket cush drive rubbers is good. Now with the clutch springs, are they just 'upgraded/heavy duty'? I would highly recommend Brock's clutch spring/cushion kit, and the one piece clutch clutch mod too. When I ran a similar set up, I was launching at 4500 rpm, shifting at tach-indicated 11,000. I have always foot shifted my Busa too.
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MAXIMUM OVERDRIVE / Re: STANDING 1.0 MILE, OVER 200 LIST
« Last post by FlaminRoo on November 30, 2021, 06:37:26 PM »
"Carefully Worded Press Releases" stir positive emotions amoungst the belivers,,

However,,

Have just perused the FIM Land Speed World Records Regulations, and have discovered many points of conjecture (too many to list here) regarding Voxans claims,,

Note :- Previous and Recent claimed FIM Records, although shown in the Official FIM WR Listings, are yet to be "Ratified"(under FIM stipulation, their World Records cannot be claimed until Ratified), which, unfortunately, leads one to question the "Validity" of Voxans claims,,
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MAXIMUM OVERDRIVE / Re: Will 300 mph ever be achieved on a open streetbike?
« Last post by FlaminRoo on November 30, 2021, 04:39:51 PM »
Hayabusa, ZX14, etc, chassis with rider, see center of gravity average at, and just below steering head heights, this combined with 23* 24* rakes, serve to exacerbate high speed handleing
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MAXIMUM OVERDRIVE / Re: STANDING 1.0 MILE, OVER 200 LIST
« Last post by Frank06 on November 30, 2021, 04:35:38 PM »
Good question: it sounds like they averaged speed over 1 mile but ?  If these were FIM records then maybe that's the case.  The runway is listed as 15,000' in length with an additional 1,000' at each end but that motorcycle apparently does not use a front brake.  I have a hard time believing they could generate those speeds in that distance and still get stopped.  Plus they don't make enough power to accelerate to those speeds in that distance.  We need more detail!
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MAXIMUM OVERDRIVE / Re: STANDING 1.0 MILE, OVER 200 LIST
« Last post by scott g on November 30, 2021, 12:46:39 PM »
Voxan is making more information available.

They now tell us:

"Gildo Pastor’s team had a number of other world records in their sights. After these six days of attempts, the final record tally is as follows:

Under 300 kg class

– 1 mile, flying start, partially streamlined        : 454 km/h (282 mph)"


Does this mean a one mile time trap, with room to accelerate ?
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MAXIMUM OVERDRIVE / Re: Will 300 mph ever be achieved on a open streetbike?
« Last post by scott g on November 30, 2021, 08:21:29 AM »
So many aspects to it…

How pronounced is the “side lift” from a crosswind component?

What are the effects of increased cross sectional area - both fairing and tail sections?

Sustained acceleration rate and reduced contact patch on the front wheel - and the resulting change in steering?  How dynamic is the change in handling if you ease up on the throttle and increase weight on the front in reaction to some handling issue?  What if you chop the throttle quickly if something bad is happening “right now”?!

If you do start generating a lot of “side lift” and something causes that crosswind component to exceed the “critical angle of lift” and it “stalls” - what happens to the handling of the bike?!  What happens if this flow manages to stay attached (or re-attaches) to the tail section while the “side lift” is lost on the fairing with the “side stall”? 

How does all this change if you try adding a “flat bottom” to the fairing?

I bet that is just the tip of the iceberg …

Tip of the iceberg indeed!  All great questions!

A couple of years ago I ran some simulations to calculate side lift using a simulator I found on a NASA site.  Somewhere I have the notes but IIRC it wasn't very hard to generate a couple hundreds pounds side force using typical fairing size and a small cross-wind component.  I'll look for those numbers and/or try to regenerate them.  We typically think of wings as being asymmetrical but symmetrical wings will generate lift if the angle-of-attack isn't zero degrees.

This is some pretty good thinking !

If one unexpectedly encountered a side wind of 10 mph - which is not so unusual at Bonneville, or even airport tracks, that is a side-force showing 15 feet per second of direction change.

With NO input from the rider (who may even be unaware of the wind) the bike will move toward the side of the track 15 feet in the 1st second, a total of 30 feet at the end of the 2nd second........etc.

Most of us who go over 250mph while fully tucked in prefer to not make sudden moves at those speeds.

HOWEVER, if we wait long enough - we are off the track........
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MAXIMUM OVERDRIVE / Re: Will 300 mph ever be achieved on a open streetbike?
« Last post by Frank06 on November 30, 2021, 06:50:32 AM »
So many aspects to it…

How pronounced is the “side lift” from a crosswind component?

What are the effects of increased cross sectional area - both fairing and tail sections?

Sustained acceleration rate and reduced contact patch on the front wheel - and the resulting change in steering?  How dynamic is the change in handling if you ease up on the throttle and increase weight on the front in reaction to some handling issue?  What if you chop the throttle quickly if something bad is happening “right now”?!

If you do start generating a lot of “side lift” and something causes that crosswind component to exceed the “critical angle of lift” and it “stalls” - what happens to the handling of the bike?!  What happens if this flow manages to stay attached (or re-attaches) to the tail section while the “side lift” is lost on the fairing with the “side stall”? 

How does all this change if you try adding a “flat bottom” to the fairing?

I bet that is just the tip of the iceberg …

Tip of the iceberg indeed!  All great questions!

A couple of years ago I ran some simulations to calculate side lift using a simulator I found on a NASA site.  Somewhere I have the notes but IIRC it wasn't very hard to generate a couple hundreds pounds side force using typical fairing size and a small cross-wind component.  I'll look for those numbers and/or try to regenerate them.  We typically think of wings as being asymmetrical but symmetrical wings will generate lift if the angle-of-attack isn't zero degrees.
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MAXIMUM OVERDRIVE / Re: Will 300 mph ever be achieved on a open streetbike?
« Last post by scott g on November 29, 2021, 09:08:11 PM »
Agree ... With "suitable" modifications on the Hayabusa (don't know about anything else), 250 - 270 mph is marginally safe.  The aero fairings that allow current "stock" framed bikes to eclipse 270 have major issues with cross winds at any speed.
Yes, Ransom, I think we are pretty close on understanding all this.

250mph - 275mph seems about the safe upper limit with the stock
Hayabusa package - and the use of a raked frame and extended
swingarm from the 260-75 range seems very helpful.

I suspect that if our bikes were running in perfectly
still and motionless air, the safe limit would go higher -
 especially with SUITABLE LSR bodywork. 

That could take us to the 296-310mph area. 

Conditions "downtrack" - especially at Bonneville - are
 hard to predict, so things get very chancy in a real hurry.

Bike-specific inputs. like putting 700hp through a swingarm
built for 300hp, or side forces put into the steering at 325mph
on  a bike built for 225mph also bring surprises.

I have a 45psi turbo alcohol bike that has shown about 700hp,
and I am afraid both to put a fast body on it, OR a fast rider on it...............

Right now, we are putting our "fast bike" efforts
 into our side-car bike based on a Hayabusa.

320mph (and still pulling on the way out) with only 550hp ..............
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MAXIMUM OVERDRIVE / Re: Will 300 mph ever be achieved on a open streetbike?
« Last post by fj1289 on November 29, 2021, 08:28:30 PM »
So many aspects to it…

How pronounced is the “side lift” from a crosswind component?

What are the effects of increased cross sectional area - both fairing and tail sections?

Sustained acceleration rate and reduced contact patch on the front wheel - and the resulting change in steering?  How dynamic is the change in handling if you ease up on the throttle and increase weight on the front in reaction to some handling issue?  What if you chop the throttle quickly if something bad is happening “right now”?!

If you do start generating a lot of “side lift” and something causes that crosswind component to exceed the “critical angle of lift” and it “stalls” - what happens to the handling of the bike?!  What happens if this flow manages to stay attached (or re-attaches) to the tail section while the “side lift” is lost on the fairing with the “side stall”? 

How does all this change if you try adding a “flat bottom” to the fairing?

I bet that is just the tip of the iceberg …
10
BIKE TALK / Re: Checking Up On You Bums!
« Last post by Ali123 on November 29, 2021, 02:18:59 PM »
ALI123 checking in.
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