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-   -   New Human Powered speed record! (http://www.bikeforums.net/recumbent/913189-new-human-powered-speed-record.html)

Jeff Wills 09-15-13 08:59 PM

New Human Powered speed record!
 
I'm just back from Battle Mountain, Nevada- if you haven't heard, Team TU-Delft/VU-Amsterdam just set a new world human-powered speed record: 83.13mph! Woo-hoo! Yippee!
(And I was manning the timing table so I got to know about the record almost before everyone else.)

http://www.hptdelft.nl/en/index.php?...blog&Itemid=58

http://jnyyz.wordpress.com/2013/09/1...s-and-banquet/

http://www.hptdelft.nl/nl/images/blo...30910-0289.jpg

Shimagnolo 09-15-13 09:07 PM

How the hell does the driver see???
Is that a camera in that pod on top feeding a video screen inside?

Jeff Wills 09-15-13 09:17 PM

Quote:

Originally Posted by Shimagnolo (Post 16069485)
How the hell does the driver see???
Is that a camera in that pod on top feeding a video screen inside?

Exactly. There are two separate camera systems. Redundancy is a safety requirement for camera bikes and trikes at Battle Mountain.

This is the Cygnus team demo'ing their camera system at the Tuesday show 'n' shine:

http://jnyyz.wordpress.com/2013/09/1...how-and-shine/

http://jnyyz.files.wordpress.com/201...pg?w=300&h=225

cplager 09-16-13 06:30 AM

How big are the wheels on that puppy?

osco53 09-16-13 03:40 PM

Unreal, the Chainrings must be what 100 teeth jobs ??

I guess that little hole up front is the Air Intake, mans gotta breathe right !

Jeff Wills 09-16-13 11:32 PM

Quote:

Originally Posted by cplager (Post 16070193)
How big are the wheels on that puppy?

20", 406mm rims. I'm pretty sure they were using the Michelin solar car special tires, which are $125 each.

Here's a few more from my collection. I have some more to process, including a bunch of really pretty scenery.

Saturday morning:
http://www.flickr.com/photos/ohpv/se...7635578132764/

Saturday evening:
http://www.flickr.com/photos/ohpv/se...7635578290744/

Jeff Wills 09-16-13 11:35 PM

Quote:

Originally Posted by osco53 (Post 16072444)
Unreal, the Chainrings must be what 100 teeth jobs ??

I guess that little hole up front is the Air Intake, mans gotta breathe right !

Most of the bikes are using two-stage compound drivetrains. That is, the primary uses normal size chainrings and cogs, but then an additional sprocket and cog step up the ratios so top gear is in the 300 gear-inch range.

JanMM 09-17-13 07:24 PM

Quote:

Originally Posted by Jeff Wills (Post 16073871)
Most of the bikes are using two-stage compound drivetrains. That is, the primary uses normal size chainrings and cogs, but then an additional sprocket and cog step up the ratios so top gear is in the 300 gear-inch range.

Great pics.
My knees hurt thinking about 300 gear-inches............

Jeff Wills 09-17-13 08:03 PM

Quote:

Originally Posted by JanMM (Post 16077130)
Great pics.
My knees hurt thinking about 300 gear-inches............

Think about this: Graeme Obree's prone "Beastie" was a single-speed, and he powered it up to 57mph.

rm -rf 09-17-13 08:47 PM

found another video.


cplager 09-18-13 05:29 AM

Quote:

Originally Posted by Jeff Wills (Post 16077257)
Think about this: Graeme Obree's prone "Beastie" was a single-speed, and he powered it up to 57mph.

Woah! I wonder what he could have done with gears. (I'm assuming he optimized his gearing for the high end, but it still must have taken it out of him getting up there.)

delcrossv 09-18-13 10:41 AM

Quote:

Originally Posted by cplager (Post 16078105)
Woah! I wonder what he could have done with gears. (I'm assuming he optimized his gearing for the high end, but it still must have taken it out of him getting up there.)

It originally in the 230 range and he told me it was too low (stability problems at higher cadence on the bike). He swapped it up on site. 280" fixie with a linear drive. Yep, no freewheel on Beastie.

cplager 09-18-13 10:57 AM

Quote:

Originally Posted by delcrossv (Post 16079237)
It originally in the 230 range and he told me it was too low (stability problems at higher cadence on the bike). He swapped it up on site. 280" fixie with a linear drive. Yep, no freewheel on Beastie.

Then maybe he should use a unicycle gears? I believe it's usually a factor of two, but works well in environments where you HAVE to be in a gear.

gnome 09-18-13 07:08 PM

Quote:

Originally Posted by delcrossv (Post 16079237)
It originally in the 230 range and he told me it was too low (stability problems at higher cadence on the bike). He swapped it up on site. 280" fixie with a linear drive. Yep, no freewheel on Beastie.

That is just insane. Yet he managed to start it without exploding his knees. very impressive.

cplager 09-19-13 08:49 AM

Quote:

Originally Posted by gnome (Post 16081050)
That is just insane. Yet he managed to start it without exploding his knees. very impressive.

I assume he got a push (as most people riding bikes like this do). Even so, you're point is right on the money. :)

BlazingPedals 09-22-13 01:03 PM

Quote:

Originally Posted by rm -rf (Post 16077448)
found another video.


Video clips were taken at different times. (Different shadowing for each clip.) That's not surprising, but I wonder if one of them was actually taken on the record-breaking run?

Jeff Wills 09-22-13 02:06 PM

Quote:

Originally Posted by BlazingPedals (Post 16092568)
Video clips were taken at different times. (Different shadowing for each clip.) That's not surprising, but I wonder if one of them was actually taken on the record-breaking run?


I shot this just before the VeloX3 entered the traps on Saturday evening. Then I had to drop the camera to push the button that captured the wind reading.

http://farm4.staticflickr.com/3771/9...d15bf475_b.jpg


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