The REAL difference between 30mph and 50mph !

[Doctorbass]

Doc

[Link]

LOL, I remember this one. Then again, I've watched WAY too much YouTube, so that's not really surprising...

[rguy56]

Speed'll get you out of trouble every time!!! Good one!

Bob

[Zoot Katz]

Not funny.

When a pedestrian is struck the likelihood of death increases faster than the percentage increase in vehicle speed in a nonlinear fashion.
At 20mph the odds of pedestrian death is 5%
At 30 mph the odds of pedestrian death is 45% or 37% depending on which study you read.
At 40 mph the odds of pedestrian death is 85% or 83% depending on which study you read.

Were I to expound on this subject it would require moving to the cesspool.

[rguy56]

Ok, so it's dark comedy. Beyond slapstick. Still, to the twisted among us, it's a funny gag.

I'll bet I've dealt with more dead people on the streets than pretty much everyone here, and it effects me deeply and profoundly. For a couple of years I wouldn't even ride my bike because of it.

The video, or the tag line, is clearly not meant seriously. At most it's pointing back at the "FICKLE FINGER OF FATE".

Bob

[Doctorbass]

At 40 mph the odds of pedestrian death is 85% or 83% depending on which study you read.

It's good to know that.. we are a dozen here that can go that speed and sometime 45mph...

so i would guess that 45mph = 99%

Doc

[Zoot Katz]

Ok, so it's dark comedy. Beyond slapstick. Still, to the twisted among us, it's a funny gag.

I'll bet I've dealt with more dead people on the streets than pretty much everyone here, and it effects me deeply and profoundly. For a couple of years I wouldn't even ride my bike because of it.

The video, or the tag line, is clearly not meant seriously. At most it's pointing back at the "FICKLE FINGER OF FATE".

Bob

Oh, I got the "humour".

While speed isn't the leading cause of collisions it is the greatest factor when tabulating the deaths resulting from those collisions.
I've also heard all the excuses drivers use to rationalise their blatant disregard for speed limits. That they're above average and the speed limits are under posted are the leading two.

Fact is, in that video the driver should have stopped when they saw the pedestrian at the crosswalk. Too often they speed up to deny a pedestrian their opportunity to cross the street just so they don't have to brake.

What further raises my bile is that motorcide is generally punished with a wrist slap.

[Zoot Katz]

At 40 mph the odds of pedestrian death is 85% or 83% depending on which study you read.

It's good to know that.. we are a dozen here that can go that speed and sometime 45mph...

so i would guess that 45mph = 99%

Doc

I've ridden a bicycle at over 50mph drafting trucks on the highway wearing only gloves for "safety" gear.
Considering that Sam Wittingham has done over 82mph on the flats with pedal power alone, ebike speeds under that don't impress me much.

I've thrown a motorcycle down the road at over 60mph and I'm still here. Tip: don't try standing up until you've stopped sliding.

That collision fatalities increase with speed is due to the mass of the object hitting you. Newton's law.
Maybe somebody can figure out how fast 300 lbs of bike and rider has to hit a pedestrian for an assured kill. Don't forget to factor in age as it also affects survivability rates.

[Doctorbass]

I totally agree with you Zoot Katz !

There is only one thing that catch my attention strangely: the 82mph ON FLAT by pedaling

Is it in a special aerodynamic low profile shape??

Cause the best cyclist can do max 1300W... I mean the best! and during few second... not holding!

.. And that at 40mph the power required to hold this speed is around 2200W.. so.. i guess with the non linear factor 82mph would need like 7000 or 8000W just to fight the wind..

I would like to get more info about this "speed record?"

Doc

[Zoot Katz]

I totally agree with you Zoot Katz !

There is only one thing that catch my attention strangely: the 82mph ON FLAT by pedaling

Is it in a special aerodynamic low profile shape??

Cause the best cyclist can do max 1300W... I mean the best! and during few second... not holding!

.. And that at 40mph the power required to hold this speed is around 2200W.. so.. i guess with the non linear factor 82mph would need like 7000 or 8000W just to fight the wind..

I would like to get more info about this "speed record?"

Doc

Yup, it's a low racer type recumbent. The shell is designed by Georgi Georgiev without aid of windtunnel testing. He's a sculptor and owner of Varna Cycles that makes bikes for people with special needs. Sam is the owner of Naked Bikes builder of fine custom handmade bikes.

The world record holding HPV:
http://www.fortebikes.com/gosamgo/A3/ma ... ign06.html

Lots more on Google and YouTube.
http://tinyurl.com/6xwola

[Freddyflatfoot]

Sam whittingham holds the world speed record for a HPV.
Yes, it is a streamlined recumbent bike, and he managed 132.5 kph, through a 200 m speed trap at Battle Mountain, in Nevada.
FYI, other HPV records broken this year.
1 Hour speed record, ~87.2 kph for a faired recumbent
and 49.6 kph for an unfaired recumbent!
Cheers!

[cerewa]

I would like to get more info about this "speed record?"

The bicycle speed/power calculator
http://www.kreuzotter.de/english/espeed.htm
says that:
1000 watts gets you about 37 miles per hour on a road bike and 43 miles per hour on a high end timetrial bike. (upright bicycles).
According to the calculator 1000 watts gets you about 73 miles per hour for a bike like this one:
http://www.speed101.com/images/sb/whitehawk_1999.jpg

This bike,
http://images.google.com/images?q=varna+diablo
...which us the holder of the 82mph record, might well be able to go 82mph on 1000w of power. I'm not sure of Sam Wittingham's power output, but I suspect he puts out less power than whoever it is that was measured at 1300 watts... but Sam is obviously very strong.

[Doctorbass]

I would like to get more info about this "speed record?"

The bicycle speed/power calculator
http://www.kreuzotter.de/english/espeed.htm
says that:
1000 watts gets you about 37 miles per hour on a road bike and 43 miles per hour on a high end timetrial bike. (upright bicycles).
According to the calculator 1000 watts gets you about 73 miles per hour for a bike like this one:
http://www.speed101.com/images/sb/whitehawk_1999.jpg

This bike,
http://images.google.com/images?q=varna+diablo
...which us the holder of the 82mph record, might well be able to go 82mph on 1000w of power. I'm not sure of Sam Wittingham's power output, but I suspect he puts out less power than whoever it is that was measured at 1300 watts... but Sam is obviously very strong.

I believe that there is no cyclist that can hold 1000W during 10 seconds! this world record breaker use 500W max at this record speed and it's for a brief period...

[Mathurin]

Something like that, pro level sprinters make for incredibly hot races, certainly makes you appreciate why stiffness reigns supreme on their bikes:



But anyways at the rehab center there were perhaps 10X more motorcyclists then cyclists, yet on the roads there's 20-50X more cyclists. To me, this strongly suggests that faster does not equal safer.

[Hangdog98]

Food for thought. Robbie McEwen, who's won a number of Tour de France stages in sprint finishes: his measured power output is closer to 1,700 Watts (SRM meter) and he only weighs 135-140 pounds. He is not the most powerful cyclist on earth by a long shot. I've read that some track cyclists generate 2500W+.

Of course I've not measured McEwan personally but that's the skinny from the peloton.

*Insert standard IMHO disclaimer here*

I'm no expert unless I'm on the internet

[Doctorbass]

Food for thought. Robbie McEwen, who's won a number of Tour de France stages in sprint finishes: his measured power output is closer to 1,700 Watts (SRM meter) and he only weighs 135-140 pounds. He is not the most powerful cyclist on earth by a long shot. I've read that some track cyclists generate 2500W+.

Of course I've not measured McEwan personally but that's the skinny from the peloton.

*Insert standard IMHO disclaimer here*

I'm no expert unless I'm on the internet

HP would change to (Human Power)

2.5kW is 3.5Hp PEAK i guess!

[Zoot Katz]

Food for thought. Robbie McEwen, who's won a number of Tour de France stages in sprint finishes: his measured power output is closer to 1,700 Watts (SRM meter) and he only weighs 135-140 pounds. He is not the most powerful cyclist on earth by a long shot. I've read that some track cyclists generate 2500W+.

Of course I've not measured McEwan personally but that's the skinny from the peloton.

*Insert standard IMHO disclaimer here*

I'm no expert unless I'm on the internet

HP would change to (Human Power)

2.5kW is 3.5Hp PEAK i guess!

Yes. But, they can't put out that much for as long as your battery pack will.
Hitting a peak of 2200 W in the final 100 meters is doable by top echelon pro sprinters.

Marty Nothstien was pushing 2200 Watts when he won gold in Sydney. That's spinning a 50 X 14 gear at 160 rpm. . . 49 MPH.

I doubt there's many people here who can put out more than three watts per kilogram of body weight for more than an hour.
Being able to hold 10 watts/kg for one minute puts you in the pro tour category.

The Tour de France average speed is over 42KmH for ~3500 kilometers in three weeks. It's more than a matter of overall Watts though. Smaller guys climb easier, bigger guys catch 'em in the sprints. Psychological factors enter the equation also.

Here's some interesting tables and graphs:
http://www.adventuresofgreg.com/hpvlog/09-19.html

[rguy56]

3W/kg. woo hoo! I could throw out these motors!

Bob

[Hangdog98]

Yes. But, they can't put out that much for as long as your battery pack will.

Yes I know. It's a 100% effort for the last 60 metres or so and lasts about 20 to 30 seconds before the curve drops away to almost nothing. But it's still an impressive human power output, albeit brief.

[Zoot Katz]

Yes. But, they can't put out that much for as long as your battery pack will.

Yes I know. It's a 100% effort for the last 60 metres or so and lasts about 20 to 30 seconds before the curve drops away to almost nothing. But it's still an impressive human power output, albeit brief.

If you don't puke or collapse at the end of a time trial, you know you could have gone faster.

[Mathurin]

Coggan & Allen's Training and racing with a power meter has a scale that tops off with the cream of world class pro's at 24.04w/kg for 5s, 11.50w/kg for 1min, 7.60 w/kg for 5min and an FT of 6.40 w/kg. We're talking people who's been training since they were kids, have genetic anomalies that predispose them to being good at cycling and are doped to the max they think will pass undetected.

That's a completely different time zone next to real life, where pretty much every cyclist goes between 25-30 km/h on the flats.


Protip: Weed increases hematocrit, it's why the UCI banned it. It also turns your bike into a frocking jet, and you become a pilot.

Edit: darn, edited while reply.

[Hangdog98]

I think I'm pumping out a massive 3W per Kg at peak effort. Not very impresive at all I'm afraid. Maybe I should get some of that CERA.

[Hangdog98]

Protip: Weed increases hematocrit, it's why the UCI banned it. It also turns your bike into a frocking jet, and you become a pilot.

Weed increases hematocrit in the same way cigarettes do. The smoke contains carbon monoxide which is 200 times more attracted to haemoglobin than oxygen is. The CO molecule attaches itself to your red blood cell and stays there until the cell dies, in 75 days or so. With millions of cells now rendered useless by carbon monoxide, the body has to create new red cells and this is how you show a higher hematocrit, though up to 20% of your blood can no longer carry oxygen.

The jet pilot sensation you are experiencing at 15mph... is from the other component of the weed.