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91
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 ..............
92
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 …
93
BIKE TALK / Re: Checking Up On You Bums!
« Last post by Ali123 on November 29, 2021, 02:18:59 PM »
ALI123 checking in.
94
MAXIMUM OVERDRIVE / Re: Will 300 mph ever be achieved on a open streetbike?
« Last post by Frank06 on November 29, 2021, 11:33:19 AM »
I sometimes think that the fairings are *too* good i.e. they reduce drag by a fair amount but at the price of acting like big wings.  The slightest crosswind component and you get lift: sideways.
95
MAXIMUM OVERDRIVE / Re: Will 300 mph ever be achieved on a open streetbike?
« Last post by RansomT on November 29, 2021, 08:44:57 AM »
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. 
96
MAXIMUM OVERDRIVE / Re: Will 300 mph ever be achieved on a open streetbike?
« Last post by FlaminRoo on November 28, 2021, 06:37:31 PM »
I would think that with suitable modification to
chassis and body, 325mph speeds would be reasonable ...............


Remove the word "suitable", replace with "extensive"  :|

Unfortunatly, both men who have achieved 300+mph are no longer with us due in part to handleing issues on modern sportsbike geometry with "bolt on" modifications,,

Modern Sportsbikes are constructed to have fun in the Twisties,, Top Fuel bikes have evolved (from sportsbikes) to go extremily fast in a straight line,,

I suggest an extensive rethink on machine stability at speeds over 250mph is a "Priorty",, rake, wheelbase, lower c of g, and that's even before we start thinking about slippery bodywork  :)
97
MAXIMUM OVERDRIVE / Re: Tires
« Last post by fj1289 on November 28, 2021, 09:55:05 AM »
A bit of a crossover from the Voxan/Biaggi thread - while searching for current info on that effort (and failing) - found this snippet in an earlier article:
“ Being French, it’s no surprise Voxan turned to Michelin to provide tires for its project. What is a surprise is the fact the Wattman uses completely standard tires you and I can buy off the shelf – the Michelin Power RS+, to be exact. They’re rated at 350 km/h (217 mph), but because safety is obviously most important, Michelin and Voxan jointly bench tested the rubber to verify it was able to withstand speeds 100 km/h faster (280 mph). Both parties agreed this was an acceptable buffer.”
From: https://www.motorcycle.com/features/voxan-and-max-biaggi-set-11-new-electric-world-records.html

Wonder how this was tested?  How it was documented?  Can this testing and documentation be accepted by other sanctioning bodies?  How expensive/time consuming would the effort be with another tire?
98
MAXIMUM OVERDRIVE / Will 300 mph ever be achieved on a open streetbike?
« Last post by Frank06 on November 28, 2021, 03:48:42 AM »
Aero controls ultimate speed and at Bolivia speeds exceeding 300 are very possible without big, big power. All the details better be right though!

Sent from my SM-T380 using Tapatalk

99
MAXIMUM OVERDRIVE / Re: Will 300 mph ever be achieved on a open streetbike?
« Last post by scott g on November 27, 2021, 05:31:36 PM »
I would think that with suitable modification to
chassis and body, 325mph speeds would be reasonable ...............
100
MAXIMUM OVERDRIVE / Re: STANDING 1.5 MILE, OVER 200 LIST
« Last post by scott g on November 27, 2021, 05:26:39 PM »
Max Biaggi, Roman Emperor and oft-thought rival to Valentino Rossi,
also of Italy, has established a electric 2-wheel speed record over 283mph
at the Space Shuttle landing strip at Cape Kennedy Space Center this week.

The info on the  283.182 mph Biaggi speed is
up on the FIM web site.


That would be good for 5th place on this list.

This officially makes Biaggi considerably FASTER
 than Rossi on lists of official top speeds.

If this was done from a 1.5mile start,
this would jump Biaggi to 2nd on the list.
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