1,459 reputation
714
bio website neverfear.org
location Adelaide, Australia
age
visits member for 2 years, 5 months
seen Nov 13 at 9:27

My contact info can be found on http://neverfear.org/profile/ben or alternatively I could be contacted via http://twitter.com/_dbr


Jul
5
comment Analysis of Stages high-speed data
Interesting, the ride was indeed on 170mm cranks and only measuring at the left crankarm
Jul
5
comment Analysis of Stages high-speed data
@R.Chung Hm, the recording start/stop seemed a bit unpredictable, so I'm actually not certain how it relates to my Garmin recording of the same ride. According to the timestamps, it started at the left side of this graph (selected region selected to show the cadence Y axis scale), but it lines up better this this part (which roughly lines up with the Garmin lap markers I added trying to sync the two)
Jul
4
comment Why the penny-farthing?
"Without a drivechain the only option is pedals connected directly to a wheel" - what about gears without a chain? (I guess it'd be hard to make a practical structure rigid enough to not skip under load?)
Apr
30
comment When Mark Cavendish says he's sprints at 1500 watts how long is that for?
@user95786 That number sounds plausible enough - I wouldn't worry about it.. It is difficult to draw meaningful comparison from two different people's power-meter numbers - there are a lot of factors to consider
Apr
23
comment Reason behind the Tour Down Under “People's Choice Classic”
Ahh, interesting.. Matching the distance in 2004 seems to explain it (and also why I came across many races of varying durations in finding similar races) - thanks!
Mar
22
comment How long do Garmin's cycling GPS devices take to get an initial GPS lock?
The lock procedure is quite complicated, and can vary the lock time a lot.. but where I'd expect my Garmin Edge 500 (GPS only) to lock in about 20-30 seconds, I'd expect my Edge 510 (GPS+GLONASS) to take around 5-10 seconds.
Mar
20
comment Speed and comfort of a racing bicycle?
There's video of Guy Martin riding that bike at 181km/h - youtube.com/watch?v=wT0eJXtrwHg - it is a custom built bike, towed to get up to speed, then riding very close behind a modified truck.. So by no means a standard racing bike!
Mar
17
comment What format should I select for automatic upload to Strava?
A good answer. Strava uses the lap markers (and displays them on the activity page)
Sep
23
comment How do I help the less experienced cyclist cope with a hill climb?
Since this is all based on "1 hour P=100 watts", wouldn't the resulting calculation only be valid for a 1-hour long climb?
Aug
9
comment Why would a bike computer calculate distance accurately but average speed inaccurately?
@BenediktBauer Oops, thanks for spotting my, err, numeric dyslexia.. but, the main point was to demonstrate how limitations in the calculation would introduce errors. Edited the question to clarify this a bit
Jan
31
comment Why aren't Tour de France riders going any faster?
Like the weight limit, there are many rules which effectively ban other advancements like more aerodynamic water bottles. The UCI have similar rules for track racing, which have made the traditional hour record practically impossible to beat (covered nicely in the documentary about Chris Boardman's final hour-record attempt)
Jan
15
comment DIY computational fluid dynamics for aerodynamics?
This nicely summarises why I suspected this wasn't really going to work. As you say, just analysing frontal-area/positioning based on photos definitely sounds more productive... Thanks!
Dec
30
comment DIY computational fluid dynamics for aerodynamics?
@whatsisname Did you find a proper keyboard? Really curious to see your answer!
Nov
30
comment DIY computational fluid dynamics for aerodynamics?
@R.Chung (heh, so is it safe to assume you are "that" Chung, or just a huge fan? :P). That link is interesting, "CFD simulations predicted the drag areas with an accuracy of about 11% for RANS and about 7% for LES". If that's the accuracy with a laser-scanned model and proper CFD sim, a photo-based model and a fluid-simulator intended to make pretty images probably isn't going to be terribly accurace..
Nov
30
comment Safety vests: Yellow vs. Orange?
Here's the actual graph of cone-cell response. The eye is definitely most sensitive to green parts of the spectrum, but squishy-human-related-stuff is never that straight forward, nor is light. E.g most lighting you will encounter (i.e not lasers) will be spread over the entire visible spectrum (like this), and materials/colours vary widely in how they reflect this (meaning fabric that is "bright" under sunlight might be almost invisible under streetlight)
Nov
30
comment DIY computational fluid dynamics for aerodynamics?
@freiheit My main question is "Could there be any worthwhile insights gained from this", which I think could have a good objective answer from someone who has attempted this before. Edited the question slightly - does it seem any better? I'm not totally sure how to word my question in a way that seems less chatty/discussion'y
Nov
29
comment DIY computational fluid dynamics for aerodynamics?
Wait, there's no badge for nerdiest-question-on-Bicycles.SE?
Oct
16
comment Velodrome atmospheric conditions
@R.Chung Hm, good point.. but shouldn't matter much in this case, right? I guess the rolling resistance would be a constant value added to the required-power, and the default barometric-pressure/humidity values are fine and arbitrary (without knowing the "Olympic mandated" values)
Sep
17
comment What is a reasonable speed for long distances on a bike?
@mattnz good point, it was on different bikes, but they are all comparable (two road bikes, and a hybrid which has road tyres) - other factors caused far more noticeable variance
Sep
15
comment Is it possible to estimate road grade while riding?
I wonder how accurate it'd be if you attached the iPhone with a bike-mount, and zero'd the inclinometer application on a known-flat surface (with a spirit level, say)