Advertise on Bikeforums.net



User Tag List

Results 1 to 21 of 21
  1. #1
    brother's keeper Zum1's Avatar
    Join Date
    Nov 2006
    Location
    ill-adelphia
    My Bikes
    Ross Carrera, Cayne Uno, Surly Steamroller
    Posts
    115
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    "against the wind"

    Any of you that have ridden in the ill-adel the past couple of days have probably encountered the joys of the 50mph winds in yo face... as with any headwind of relative strength, rider's gotta stand up and mash with a smile or else the wind, wins and we cant have that. I experienced this more than I care to recall when i was nestled in chi-town as well, (obviously). Similarly the rider must respond in kind on all of the various hills and climbs we may encounter. So... i contemplated then, and considered again recently, the parallels of the two situations. Might any of you thinking men know of an equation that assimilates the MPH's of the wind gusts with the grade of inclination on a climb? also... feel free to respond with any wind stories/issues/discoveries/solutions you may have?

    "you dont need a weather man to know which way the wind blows"
    -Dylan
    This cat is asking if I've seen his little lost passion
    I told him: "Yeah, but only when I pedaled past him"

  2. #2
    Senior Member
    Join Date
    Dec 2007
    Location
    Athens, Ohio
    My Bikes
    Fuji Track, Half built 70s Azuki
    Posts
    1,568
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I've almost been blown over by wind.

  3. #3
    Instigator at best kjohnnytarr's Avatar
    Join Date
    Jan 2007
    Location
    Columbia, Missouri
    My Bikes
    Motobecane Jury
    Posts
    1,086
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Aero bars look dorky on my bike, but I've put them on when wind got bad.
    Quote Originally Posted by JoshFrank View Post
    (By icing I mean puke and by cake I mean Lexus)
    Bikes: Flannigan, Finn Mac, Tim Finnegan, Nicholai Ivanich
    Words: Going Underground, Pedicabs After Dark, Thanksgiving Via The KATY Trail

  4. #4
    F'ing A shasta's Avatar
    Join Date
    Oct 2007
    Location
    SJ
    My Bikes
    08 tommaso augusta, 88 specialized sirrus, random cruisers and stuff
    Posts
    321
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If there is an equation its going to have to factor in how wide you are, what your wearing, etc. It would be cool to know though. I'm going to throw out a guess and say that every mile an hour of headwind equals 1 percent more effort.
    ride for fun

  5. #5
    Senior Member
    Join Date
    Sep 2006
    Location
    Van BC
    Posts
    3,745
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by shasta View Post
    If there is an equation its going to have to factor in how wide you are, what your wearing, etc. It would be cool to know though. I'm going to throw out a guess and say that every mile an hour of headwind equals 1 percent more effort.
    Yeah the problem with the ops question is how variable your aerodymanic profile can be. A good time trialer in a teardrop helmet with nice aero wheels is going to be much different from a typical bfssfg member in street clothes and back at 45+ degrees to the ground. It would be cool to see a ballpark figure though so I'll watch this space.

  6. #6
    Junior Member
    Join Date
    Feb 2008
    Location
    Philly
    Posts
    22
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I went for a bike ride last night at around 4am in center city...the wind almost brought me to a dead stop a few times.

  7. #7
    cab horn
    Join Date
    Jun 2004
    Location
    Toronto
    My Bikes
    1987 Bianchi Campione
    Posts
    28,295
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by kjohnnytarr View Post
    Aero bars look dorky on my bike, but I've put them on when wind got bad.
    Wtf? Aerobars make a bike more difficult to control, not less.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  8. #8
    cab horn
    Join Date
    Jun 2004
    Location
    Toronto
    My Bikes
    1987 Bianchi Campione
    Posts
    28,295
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by shasta View Post
    If there is an equation its going to have to factor in how wide you are, what your wearing, etc. It would be cool to know though. I'm going to throw out a guess and say that every mile an hour of headwind equals 1 percent more effort.
    1% would be an unrealistically low estimate.

    http://www.exploratorium.edu/cycling/aerodynamics1.html

    Yes, it's not a comprehensive calculator. But its good enough to make a point.
    15mph cycling into a 0mph headwind = 94w
    15mph cycling into a 1mph headiwnd = 108w
    15mph cycling into a 2mph headiwnd = 125w
    15mph cycling into a 3mph headiwnd = 142w

    Looks non-linear to me.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  9. #9
    Senior Member
    Join Date
    May 2007
    Posts
    199
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    In philly the wind has just been terribly annoying

    edit: it also always seem to be blowing at you for some reason too.

  10. #10
    Look at all these buttons EivlEvo's Avatar
    Join Date
    Oct 2007
    Posts
    992
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Wind with regard to power that needs to be used is a curve.

    This is why racing aircraft like the mustang which cruises easily at 270kts add huge engines to their aircraft AND clip the wings/sink rivets/smooth the canopy etc etc etc.

    This is also why propeller aircraft are essentially limited to 450mph.

    Obviously no one is going that fast on a bike here except for me haha. But its easier to exhibit looking at the top end of the graph.

  11. #11
    Senior Member maddyfish's Avatar
    Join Date
    Jul 2006
    Location
    Ky. and FL.
    My Bikes
    KHS steel SS
    Posts
    3,945
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    In heavy wind, I get down as low and narrow as I can to present less area to the wind.
    Not too much to say here

  12. #12
    Walks with a limp dijos's Avatar
    Join Date
    Nov 2006
    Location
    St Pete
    Posts
    1,341
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    +1
    I've been thinking of putting drops back on-the wind here is a little much at times.
    I am looking for a 52cm-ish lugged mixte or ladies frame. Pm if you got one.
    Quote Originally Posted by thebristolkid
    Last I checked, most college campuses were firmly attached to solid earth, which, in my experience, is typically adequate for riding a bicycle upon.

  13. #13
    dig dig dig Moximitre's Avatar
    Join Date
    Jan 2006
    Location
    Chicago
    My Bikes
    Full Fendered Bareknuckle, Faggin with 10spd Centaur, 1973 Raleigh 3spd Cruiser.
    Posts
    878
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I've been brought to a dead stop before from wind. It was eerie too, cause the streets were wet and I could literally see the gust coming at me.
    Sucks to your ass-mar!

  14. #14
    ALL PARTY ryansexton's Avatar
    Join Date
    Dec 2007
    Location
    Niagara Falls, Ontario, Canada
    My Bikes
    Douglas Touring Cross Wise, Urbanite Fixed Gear
    Posts
    664
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I hate wind so much.
    Quote Originally Posted by crushkilldstroy View Post
    This is SSFG. Nothing is logical here.

  15. #15
    dig dig dig Moximitre's Avatar
    Join Date
    Jan 2006
    Location
    Chicago
    My Bikes
    Full Fendered Bareknuckle, Faggin with 10spd Centaur, 1973 Raleigh 3spd Cruiser.
    Posts
    878
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I hate wind about half the time.
    Sucks to your ass-mar!

  16. #16
    Sausage King
    Join Date
    Feb 2008
    My Bikes
    2008 Specialized Langster, Kilo WT, 1986 Dahon Classic Folder, 1986 Panasonic Mountain Cat
    Posts
    150
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    60% of the time, I hate Bob Seger all the time.

  17. #17
    aka mattio queerpunk's Avatar
    Join Date
    May 2005
    Posts
    5,494
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    i received an offer to borrow a HED wheelset - HED3 front, disc rear - for the races at VeloCity today. Why oh why was it so windy?! i had to turn down the offer!
    the hipster myth.

    i practice vagabondery.

  18. #18
    gz_
    gz_ is offline
    FREE DEATHHARE gz_'s Avatar
    Join Date
    Jul 2007
    Location
    princeton, nj
    Posts
    302
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rolling through Wyoming and Kansas the wind almost blew me into the ground and at times I could only stop and walk. Times like those I would try and be as aero as possible, so ditch the baggy clothes, use the drops, zip everything up and it makes a big difference.

  19. #19
    Senior Member balonya's Avatar
    Join Date
    Oct 2007
    Location
    funky town
    Posts
    112
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by hazylines View Post
    In philly the wind has just been terribly annoying

    edit: it also always seem to be blowing at you for some reason too.
    I live in filthidelphia and the wind there is no joke downtown is just a series of wind tunnels

  20. #20
    Hello. crushkilldstroy's Avatar
    Join Date
    Jun 2005
    Location
    West Seattle
    Posts
    2,902
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Abe Froman View Post
    60% of the time, I hate Bob Seger all the time.
    Damn. I wanted to make the Seger joke.

    Is he still alive?
    Quote Originally Posted by Jacquie Phelan
    Until mountain biking came along, the bike scene was ruled by a small elite cadre of people who seemed allergic to enthusiasm.

  21. #21
    Senior Member TimArchy's Avatar
    Join Date
    Jun 2003
    Location
    Atlanta
    My Bikes
    Zeus (Razesa) tarck, Giant TCR road, Eddy Merckx road, Fuji Touring Series IV for everything else
    Posts
    1,155
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    We've established that the graph of the power required to overcome a 1mph increase in wind speed is non-linear.

    I would assume that the graph of the power required to overcome an x deg. difference in gradient is also non-linear. Or it may be linear up to a certain point, but at 91 deg (just past vertical), the power required (provided you can stick to the road) will be less than at 90 deg, so the graph will begin to drop.

    The problem here is that for a body facing wind resistance, more resistance can always be countered by more power (the graph will keep going up to infinity) provided that the body can endure the forces applied.

    So, in general, the graphs cannot be the same so there cannot be an equation that shows a useful relationship between the two for any variables x, y (x,y : neg. Infin.< x,y < Infin. ).

    What we would need to do it focus in on a small part of each graph. Say 0 to 45 deg of inclination and 0 to 75mph air velocity (bike velocity + wind velocity in an opposing direction). Then we have to add mass and frontal surface area to both equations. Starts to feel awfully sticky to me. Maybe this is a case where anecdotal evidence is the most useful. i.e. ask an old cyclist.
    Quote Originally Posted by Josh Frank
    I will derive power from their cries of despair. My crank a speedy dervish, spinning and spinning through the darkest night that anyone with the audacity to try and suck my wheel will ever see...

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •