# Hour Record (may contain spoilers)

Discussion in 'Pro Cycling (Road and Track Racing)' started by fimm, 30 Oct 2014.

1. ### AdrianHeed the elf's wisdom

How about reducing the air pressure by half but topping up the oxygen to compensate?

2. ### CitiusGuest

The UCI probably did think of it - and then promptly dismissed it as an absurdity.

3. ### smutchinCat 6 Racer

Location:
The Red Enclave
To calculate the difference a 1mph tailwind would make to Wiggo's speed, you'd need to know his drag coefficient, frontal area, air density and stuff like that. Completely beyond me, but I'm sure someone has the time, expertise and energy to work it out...

You'd also have to factor in friction from the tyres and wheel bearings but they're probably negligible for the purposes of this discussion.

I presume the choice to set the velodrome temperature higher was to reduce air density, but I guess the trick is finding a balance between the benefits of lower air pressure and the negative effects on performance of overheating.

4. ### swansonjVeteran

If, as i said and as @smutchin has said, you assume that rolling resistance/friction is negligible compared to air resistance, then yes, it really is as simple as 1 mph tailwind = 1 mph extra ground speed. In that scenario, I don't think you need to know the drag corefficient etc - whatever speed his power output, frontal area, and drag coefficient result in for still air, it's 1 mph high with a 1 mph tailwind. I would guess that at 30 mph with a highly aerodynamic bike, air resistance is dominant but not totally dominant, so in practice 1 mph tailwind may only be 0.8 or something extra ground speed, but still worth having.

That all breaks down when air resistance ceases to be dominant. If you have a 20 mph tailwind and you are cycling at 20 mph ground speed, then you are cycling at the same speed as the air and, to a first approximation, there is no air resistance (only to a first approximation, because there's still relative motion where the wheels rotate and your legs move). Then the situation is reversed and your speed is determined entirely (to that first approximation) by rolling resistance/friction and not at all by aerodynamics.

5. OP

### fimmVeteran

Location:
Edinburgh
New Hour Record set!!
http://www.uci.ch/pressreleases/mol...makes-history-with-new-women-uci-hour-record/
(but its the woman's one so no one is interested... sarcasm aside, I'm slightly surprised that no one has posted this yet (or have I missed it?) given that there are quite a few people on here who are more up on the women's racing scene than I am.)
Anyway, congratulations to Molly Shaffer van Houweling.

6. ### ItsSteveLovellVeteran

Location:
Bristol
I've been listening to the cycling time trial podcast where Mark Florence has had a bit of a fan boy thing going for this, but haven't seen her attempt in the press.
Her's is quite a good story, I would recommend the podcasts in which she features.

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7. ### HF2300Insanity Prawn Boy

Missed that completely (probably due to the total lack of press coverage); thanks @fimm

Last edited: 18 Sep 2015
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8. OP

Location:
Edinburgh
9. ### ItsSteveLovellVeteran

Location:
Bristol
Re: para cycling, do the second 'able' riders have to be screened? Or could someone like Jason Kenny or Kristina Vogel be the able rider to accompany the para one?

Location:
Ubique
Tandem with able bodied rider only applies to blind/partially sighted classification, I think. There is a whole set of UCI regulations about who can be the AB partner. Which are on their site, somewhere, but I can't offer a link (haven't looked beyond headers). Best left to the wise ones - UCI commissaires - to interpret. I'm sure they will be well prepared. Who knows, perhaps a poster will actually read the rules and help us all?

11. ### HF2300Insanity Prawn Boy

I detect a certain amount of cynicism there.

16.3.001 - 007 seem to govern para cycling pilot eligibility. IPC is supreme authority for para cycling. Same rules apply to tandem pilots as for para cyclists except for qualifying disability. Tandem pilots must not be members of a UCI registered team, and there's a waiting period of 12 to 24 months before former UCI registered team members can become pilots. Riders previously selected by their national federation for World Championships, Olympics, World Cups, continental championships e.g. Commonwealth Games, etc. also have to sit out a waiting period before they can ride pilot - so no Kristina Vogel or Jason Kenny, at least for 12 - 24 months. One pilot per competition, unless the pilot is ill, in which case they can be changed up to 24 hours in advance of the competition. Closer than 24 hours, tough.

12. ### HF2300Insanity Prawn Boy

Best of luck to him. Hope he gets plenty of coverage for it, as well - the more that puts para cycling up there, the better. He himself comments that many para cyclists aren't aware of these records.

13. OP

### fimmVeteran

Location:
Edinburgh
Well a small amount of googling has failed to tell me if Colin Lynch was successful in his attempt - anyone know?

14. ### CitiusGuest

He wasn't, unfortunately. Front tyre blew during the attempt and he hit the deck. He's planning another go at some point...

15. OP

### fimmVeteran

Location:
Edinburgh
Ouch, nasty. What a shame. I do hope he gets to have another go.
Thank you for the information.

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