Getting Aero - Speed Gains

Discussion in 'Motorized Bicycle General Discussion' started by lowracer, Mar 11, 2012.

  1. lowracer

    lowracer New Member

    Joined:
    Oct 17, 2008
    Messages:
    1,319
    Likes Received:
    1
    I've been an avid cyclist for many years & have owned & raced many different type of bikes ranging from Road, Track, MTB, BMX, Lowracer, Tadpole trike, Recumbent...etc
    On all of the bikes I've pedaled, lowering my body into an aerodynamic tuck (time trial position) has increased my speeds by reducing aero drag.
    One bike I owned was known as a Lightning F40 (see 1st pic) & was basically a 3/4 faired recumbent (just head sticks out) with a fiberglass nosecone & fabric body (which I later replaced with a coroplast plastic body for better aerodynamics & speed). I estimated the Lightning F40 gained ~40% speed advantage being mostly faired (max ~30 mph unfaired, ~42 mph faired). Human powered bicycle speed records in excess of 80 mph have been set due to extreme aerodynamic bodies.
    The full fairing 2 wheel bikes are awesome until the wind blows, then the sail effect causes seriously scary situations & unpractical for street use.
    Recently I began surfing for aero body fairings for upright bicycles & landed on Gravity Bikes. These BMX bikes built in the 80's & 90's with very slick motorcycle type fairings to race down hills. They are making a comeback & the fairings look slick for MB applications.
    I would like to build a fairing onto one of my three MB's to see what kind of aero gains are accomplished, & not just for speed but for efficiency & comfort. Smaller engine MB's could see significant gains in performance & efficiency by lowering the power required to move at any given speed.
    I also added a bubble & coroplast to a tadpole trike creating a 3/4 fairing (similar, but a crude variation of the slick velomobiles available today such as the Rotovelo by Trisled (see pic). The trike handled the wind much better than the F-40 but had a lower top speed, was heavier & took up more road width.
    Anybody have any ideas/comments about partial fairings and how they can be integrated onto Motored Bikes for performance, efficiency, comfort?
    -Lowracer-
     

    Attached Files:

    #1 lowracer, Mar 11, 2012
    Last edited: Mar 11, 2012
  2. lowracer

    lowracer New Member

    Joined:
    Oct 17, 2008
    Messages:
    1,319
    Likes Received:
    1
    More pics of aero fairings
    -Lowracer-
     

    Attached Files:

  3. rustycase

    rustycase Gutter Rider

    Joined:
    May 26, 2011
    Messages:
    2,746
    Likes Received:
    0
    comments?

    :)

    I think, perhaps the quickest improvement could be gained with a front-wheel disk, clip-on low bars, and a dacron/velcro sleeve over a framework made of recycled fiberglass fishing rods and slit bamboo.

    Best
    rc
     
  4. lowracer

    lowracer New Member

    Joined:
    Oct 17, 2008
    Messages:
    1,319
    Likes Received:
    1
    More pics of aero fairings
    -Lowracer-
     

    Attached Files:

    #4 lowracer, Mar 11, 2012
    Last edited: Mar 11, 2012
  5. bairdco

    bairdco a guy who makes cool bikes

    Joined:
    Aug 18, 2009
    Messages:
    6,334
    Likes Received:
    19
    my brother had one of those Hutch HPV's. that thing was crazy. had a giant gear,and i clocked him over 50, pacing him in my car.

    i've been thinking about fairings and stuff, cause i want to go for the 50cc motorcycle land speed recordat bonneville, but it's all in my head right now...
     
  6. lowracer

    lowracer New Member

    Joined:
    Oct 17, 2008
    Messages:
    1,319
    Likes Received:
    1
    Bairdco,
    Going for a land speed record would be very cool!
    For myself, I'm thinking of a 'Practical Street' fairing, an aero 'front only' fairing that wouldn't interfere with normal sitting/standing pedaling & would stay manageable through gusting winds.
    -Lowracer-
     
  7. andrewflores17

    andrewflores17 New Member

    Joined:
    Jul 12, 2010
    Messages:
    479
    Likes Received:
    0
    should definatley increase fuel economy i feel like a kite with my jacket on my bike somedays

    id only worry about the full body design for day to day use just need a 18 wheeler going by and that gust of wind could send you flying .
     
  8. lowracer

    lowracer New Member

    Joined:
    Oct 17, 2008
    Messages:
    1,319
    Likes Received:
    1
    andrewflores17,
    I had a few very scary rides on the Lightning F40 some of those involving tractor trailers going by. I remember one day in particular when the wind was blowing so strong I had to ride the bike most of the time at about a 45 degree angle just to go straight.
    I'm thinking of installing just a frontal fairing for my MB.
    -Lowracer-
     
  9. lowracer

    lowracer New Member

    Joined:
    Oct 17, 2008
    Messages:
    1,319
    Likes Received:
    1
    Here's a pic of the 80+ mph bike @ Battle Mountain Nevada
    The bike is a Varna Mephisto ridden by Sam Whittington.
    -Lowracer-
     

    Attached Files:

  10. Allen_Wrench

    Allen_Wrench Resident Mad Scientist

    Joined:
    Feb 6, 2010
    Messages:
    2,787
    Likes Received:
    1
    Ya know, Baird, if you decide to go after that record, I'd feel safe betting money on you. I keep hearing people on this forum saying your bikes are no slouches. Especially the ones with their jug on backwards. I say go for it.
     
  11. The_Aleman

    The_Aleman New Member

    Joined:
    Jul 31, 2008
    Messages:
    2,658
    Likes Received:
    1
    I've personally seen Baird do 54 on GPS with a backwards jug engine. He's got the skills and the right body to go fast.

    He could probably fit in some narrow fairings! I wouldn't ever be suprised to see him (and/or some other members here) on a record board :D
     
  12. andrewflores17

    andrewflores17 New Member

    Joined:
    Jul 12, 2010
    Messages:
    479
    Likes Received:
    0
    i think that just the front would give you all the benifits and almost none of losses if you do pics pics pics
     
  13. Dirt Road Cowboy

    Joined:
    Sep 18, 2011
    Messages:
    296
    Likes Received:
    0
  14. bairdco

    bairdco a guy who makes cool bikes

    Joined:
    Aug 18, 2009
    Messages:
    6,334
    Likes Received:
    19
    if i went for a 50cc record, i wouldn't be doing it on a china 2 stroke, that's for sure...:)
     
  15. Dirt Road Cowboy

    Joined:
    Sep 18, 2011
    Messages:
    296
    Likes Received:
    0
    What about the 9hp 50cc that DAX is selling? It looks interesting. :)



    .
     
  16. Ibedayank

    Ibedayank New Member

    Joined:
    Oct 29, 2011
    Messages:
    1,171
    Likes Received:
    0
    you want to trust your life to some made in china POS at more then 125mph.
    Your joking right???
     
  17. lowracer

    lowracer New Member

    Joined:
    Oct 17, 2008
    Messages:
    1,319
    Likes Received:
    1
    IB...lol

    DRC,
    I have been on the Vetter website in the past & really like the high mpg bikes from years ago. He has a blown full body shell kit available for sale, but for me, I'm interested in just a front nose fairing to get my upper body & legs behind similar to the pic I posted of the Blue Fairing. I also like the road bike with the guy standing behind the fairing pic.
    Wish there was a place to buy just that?
    -Lowracer-
     
  18. bairdco

    bairdco a guy who makes cool bikes

    Joined:
    Aug 18, 2009
    Messages:
    6,334
    Likes Received:
    19
    i'm thinking italian, but i've been talking to a canadien who builds ground up custom motors. the only setback, is they cost as much as a nice used car. i can't justify that cost to build a glorified moped.
     
  19. lowracer

    lowracer New Member

    Joined:
    Oct 17, 2008
    Messages:
    1,319
    Likes Received:
    1
    Here are a few more pics of the Zzipper fairings, popular on recumbent bikes & trikes.
    -Lowracer-
     

    Attached Files:

  20. lowracer

    lowracer New Member

    Joined:
    Oct 17, 2008
    Messages:
    1,319
    Likes Received:
    1
    Today, I got the milk crate nicely mounted using some aluminum bar & angle aluminum. Also incorporated some cheap handlebar mounts made for mounting water bottle cages to handlebars. I can now carry one of my two plastic gas cans (as large as 2 gallons) for long travels without gas stations fill-ups with extra room for stuff. Now I want to get some plastic fairing material to mount over & in front of the basket to get aero...
    Still researcing blown lexan type fairings from ZZipper & Mueller, but also might just experiment with some thin plastic sheet (like those roll up snow sleds) or coroplast to create a decent shape to break the wind...
    -lowracer-
     

    Attached Files:

Share This Page