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  • decamouse
    replied
    Re: Jav Specs?

    Maybe thats why alot of Javs have that sticker on them saying in Compliance with 1992 IAAF - - so does the blunt tip really give more lift when throwing with a tailwind! if you can not rough up the tail! How about a negative angle of attack -

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  • Kurt Francis
    replied
    Re: Jav Specs?

    My understanding of the Nemeth javelins was that the surface of the javelin behind the javelin grip was "roughed" up by some method. By simply analyzing this situation from a purely theoretical standpoint using basic fluid flow mechanics (I assume everyone has had that coursework ), then we have a situation of fairly laminar flow over the front portion of the javelin and more turbulent flow over the rear portion. As we all know, laminar flow gives rise to a higher percentage of lift than does turbulent flow. Thus, the front portion of the javelin would generate more lift than the rear portion, given the same velocity air flow and same aerial surface areas of both front and back. Thus, we return to a javelin more similar to that of the old "glider" javelins that existed before 1986.

    Thus ends the physics lesson for today

    Kurt

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  • gh
    replied
    Re: Jav Specs?

    Since we have conflicting stories here:

    Starting with the 1986 season (April 1 of that year) the IAAF mandated a new javelin which had the center of gravity 4cm farther forward, which meant for shorter flights because it noses down (much) more quickly.

    In 1990 former Olympic champion/WR Miklós Németh came out with a new javelin which met those specs but had some kind of grooves/indentations behind the grip, which changed the dynamics of the airlow (hey, I'm not physicist, consider that a layman's explanation) and the top-end people who used those showed marked improvement in distance. Was used during '90 and '91 but IAAF then declared that illegal.

    So yes, the new javelin has been in use since '86, but also sorta yes, the current rule dates to '92 when the '86 was refined.

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  • decamouse
    replied
    Re: Jav Specs?

    How about 1992 -

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  • Jon
    replied
    Re: Jav Specs?

    Oh, I thought he meant when did the IAAF start using that model for record purposes....

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  • Kurt Francis
    replied
    Re: Jav Specs?

    Try since 1986. My own personal javelin I bought in 1990 (an Apollo 70m) is being used currently by my own athletes and still checking in good at venues it's being thrown at.

    Kurt

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  • Jon
    replied
    Re: Jav Specs?

    >The current Jav used by men in IAAF & NCAA events was adpoted when? I know a
    >few years ago(probably like 10 now) the specs were changed, does anybody know
    >how long the current Jav has been in use?


    I'm pretty sure it was since 1998... will have to look it up to verify, though.

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  • vcr204
    started a topic Jav Specs?

    Jav Specs?

    The current Jav used by men in IAAF & NCAA events was adpoted when? I know a few years ago(probably like 10 now) the specs were changed, does anybody know how long the current Jav has been in use?
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