Recumbent bicycles · Public discussion

Re: negative drag

Started by Tom Sherman · · Last activity · 3 posts · 1,100 views

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Recumbent bicycles
Published
14 December 2007
Last activity
14 December 2007
Original author
Tom Sherman
Posts
3
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Public discussion
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  1. Andrew Muzi said:


    I'll put some cash on a bet that anything you add to your bicycle's
    frontal area reduces speed for any given constant effort. Magic fans,
    ducts, rotors, ouija boards, windscreens and sails included. Name it.
    How's $100 sound to you??...

    Not a good bet. For example, the Varna Diablo II [1] has more frontal
    area with the fairing on than off. Yet, Sam Whittingham's reported top
    speed on an unfaired lowracer similar to the Diablo chassis is in the
    low 40 mph range, while he has gone a verified 81 mph on the faired
    Diablo without the benefit of wind or gravity assist.

    I know from experience this bicycle [2] is much faster with the front
    fairing and sock, which I have to believe increases frontal area.

    [1] <http://www.varnahandcycles.com/gallery/varna_diablo_01.jpg>.
    [2] <http://www.ransbikes.com/Gallery/Archive/images/Sherman1.jpg>.

    --
    Tom Sherman - Holstein-Friesland Bovinia
    "Localized intense suction such as tornadoes is created when temperature
    differences are high enough between meeting air masses, and can impart
    excessive energy onto a cyclist." - Randy Schlitter

  2. "... and it has a fiberglass engine and it runs on water, man!"

  3. Tim McNamara said:

    "... and it has a fiberglass engine and it runs on water, man!"

    What are you talking about?

    --
    Tom Sherman - Holstein-Friesland Bovinia
    "Localized intense suction such as tornadoes is created when temperature
    differences are high enough between meeting air masses, and can impart
    excessive energy onto a cyclist." - Randy Schlitter

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