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75 Year Old Record Attempt Suggests Further Aero Improvements Possibility For TT Bikes
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Hello All,


How many Watts to get to 93 mph?

For more speed on your bike you need to shape shift to look like this:



https://www.bikebiz.com/...-break-through-90mph

The current world record for a human powered vehicle, or HPV, is a touch over 89mph. The 75-year-old Burrows believes he will be able to pedal his machine on the flats of Battle Mountain in Nevada to 93mph. (The speed is measured over a 200-metre stretch of a five-mile course.)






State Route 305 outside of town is the annual venue for the World Human Powered Speed Challenge, and this year's event will be the nineteenth. At the first event in 2000, Briton Sam Whittingham reached 72.74mph. In 2016, Canadian aerospace engineer Todd Reichert of Team Aerovelo achieved the current speed record of 89.59mph, tantalisingly close to the magic 90mph.

This year's World Human Powered Speed Challenge will be held in Battle Mountain between September 10th and 15th.

Burrows has been designing bikes and HPVs since the 1980s. His rise to prominence came when Chris Boardman rode the Burrows-designed Lotus Superbike to win Olympic gold on the Barcelona track in 1992, the pivotal event which was the springboard for the current British success in cycle sport.

Burrows' latest machine has been designed in association with aerodynamicist Glen Thompson of London South Bank University.

http://blogs.autodesk.com/...k-university-london/




Cheers, Neal

+1 mph Faster
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Re: 75 Year Old Record Attempt Suggests Further Aero Improvements Possibility For TT Bikes [nealhe] [ In reply to ]
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Full respect to Burrows and his already significant achievements. But if the machine is capable of that speed, why not strap some young beast cyclist in there and aim for 100mph?

FWIW O'Bree thought he had this event cracked too and came up fairly short...
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Re: 75 Year Old Record Attempt Suggests Further Aero Improvements Possibility For TT Bikes [nealhe] [ In reply to ]
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nealhe wrote:
"The 75-year-old Burrows believes he will be able to pedal his machine on the flats of Battle Mountain in Nevada to 93mph."
Yeah, right.

Quote:
(The speed is measured over a 200-metre stretch of a five-mile course.) [..] State Route 305 outside of town is the annual venue for the World Human Powered Speed Challenge
The five-mile long run-up to the timed section is downhill.
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Re: 75 Year Old Record Attempt Suggests Further Aero Improvements Possibility For TT Bikes [nealhe] [ In reply to ]
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Cheers for that. Not sure how I missed it being an Autodesk user.

Burrows is an interesting chap! There are some pretty quick testers over here regardless of age. IIRC Jason Queally was shoe-horned into an HPV a while back and the results weren’t spectacular. There’s a bit more to it than just watts.

Developing aero, fit and other fun stuff at Red is Faster
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Re: 75 Year Old Record Attempt Suggests Further Aero Improvements Possibility For TT Bikes [SkippyKitten] [ In reply to ]
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SkippyKitten wrote:
Burrows is an interesting chap! There are some pretty quick testers over here regardless of age. IIRC Jason Queally was shoe-horned into an HPV a while back and the results weren’t spectacular. There’s a bit more to it than just watts.

Right. I was expressing skepticism that Burrows actually believes that he'll attain 93 mph. I think there's a reasonable chance he already has a (much more) realistic target speed in mind.
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Re: 75 Year Old Record Attempt Suggests Further Aero Improvements Possibility For TT Bikes [MattyK] [ In reply to ]
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There was a BBC documentary on Graeme Obree's attempt at this record, it was very interesting viewing if you can find it.

You're right, he came up way short and there's a hell of a lot more to it than raw Watts. It looks extremely difficult trying to drive/pilot one of those things, let alone putting down some serious Wattage whilst doing it! I wouldn't fancy crashing in one at ~90 mph either.
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Re: 75 Year Old Record Attempt Suggests Further Aero Improvements Possibility For TT Bikes [RChung] [ In reply to ]
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Hello RChung and All,

Rchung writes in part: "The five-mile long run-up to the timed section is downhill."


True .... but not much of a downhill ... http://www.recumbents.com/...c2018/whpsc_site.htm


Raymond Gauge extracted the following Battle Mountain Course data from the NEDS web site.



He derived data for a 5 mile length, starting at the racer launch parking lot.. The start, and associated parking lot, are easy to locate in the NEDS site satellite/aerial photos.




He also extracted a 3d topological image of the entire course from the same data source, and then collected the course slope data and put it into an Excel spreadsheet.





This is all significant because the IHPVA rule for speed records states that the slope of the entire course must not be more the 2/3 percent downhill overall.

The rule with this slope is historical, and all top speed records have been made with it in mind since the 1980s when many top speed runs were performed at an California IHPVA airport venue with a slope of 0.66 percent.



170 foot drop in 5 miles = 0.6439% grade overall

Cheers, Neal

+1 mph Faster
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