When Everything Begun

Discussion in 'Airheads' started by yellowbirdrs, Mar 27, 2012.

  1. yellowbirdrs

    yellowbirdrs Been here awhile

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    1st. BMW airhead ever built
    <object style="height: 390px; width: 640px">


    <embed src="http://www.youtube.com/v/tybxjI0Vx_Q?version=3&feature=player_embedded" type="application/x-shockwave-flash" allowfullscreen="true" allowscriptaccess="always" height="360" width="640"></object>
    #1
  2. CurlyMike

    CurlyMike Formerly SaddleSoar

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    that was coooool. Back brake was a trip.
    #2
  3. supershaft

    supershaft because I can

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    Vech and his wife, Richard, and others there at Benchmark are good folks in my book.

    The computer graphics person kinda missed the boat on the boxer layout! :D
    #3
  4. helion42

    helion42 Been here awhile

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    That was bugging me as well, maybe the archaic versions had aligned side-to-side motion, vs. opposed, out-at-the-same-time piston motion? It would undoubtedly be much less smooth, and I thought that was one of the huge qualities of them.
    #4
  5. supershaft

    supershaft because I can

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    They have always had 180 degree cranks hence the name boxer. The graphics is a 360 degree crank. I guess our bikes would be called dancers if they had 360 degree cranks!?! Or maybe paint shakers?
    #5
  6. Stagehand

    Stagehand Imperfectionist

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    If they werent 180 apart, it would shake itself to bits inside of 10 revolutions, I reckon

    Or it would need Massive counter-balancers.
    #6
  7. peterman

    peterman cop magnet

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    :hmmmmmwith relation to bore and stroke,,an engine is said to be "over square", "under square", or "square",as are BMW's,
    ,hence the term boxer.
    Hmmmm, I stand corrected,,thanks Bobby!
    #7
  8. JonnyCash

    JonnyCash turd polisher

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    That's a bunch of crap. An R50 is well under square, and an R100 is over square.
    #8
  9. Stagehand

    Stagehand Imperfectionist

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    Interesting interpretation. Square box.

    I suppose you could then call then Cubists, but the first ones were really more Art Deco. And then I think they evolved directly into post-modernism from there.
    #9
  10. disston

    disston ShadeTreeExpert

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    The graphics of the engine in that video are just wrong. The cylinders are even firing, one cylinder fires for every 180* of crank rotation. You can hear the cylinders firing evenly in the video.

    I doubt the reference to Boxer is because of Square bore to stroke cylinders. In the 20's and for quit a long time all engines were long strokers. The term Over Square is rather modern. Short stroke for higher RPM. And a gas waster too, BTW. Don't know the right answer tho, so you might be right.

    I hope Vech can do something about this. He's featured maybe he an protest the ignorance of who ever messed the graphics up.
    #10
  11. Stagehand

    Stagehand Imperfectionist

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    the term boxer was surely for the engine style not represented in this video.


    there is no other way:

    [​IMG]



    Im going to call mine "a pugilistic motor" from now on.

    [​IMG]


    at least, this is what i was led to believe by the same people that told me the blue/white logo thing was a propeller from back in the airplane days.
    #11
  12. sebastianhammer

    sebastianhammer Adventurer

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    http://www.dict.cc/german-english/Boxermotor.html

    <table class="nopad" cellpadding="0" cellspacing="0" width="100%"><tbody><tr title="article sg | article pl"><td valign="top">NOUN </td><td width="95%"> der Boxermotor | die Boxermotoren </td><td align="right" valign="top">
    </td></tr></tbody></table>
    <dl><dt class="hl2">Boxermotor <var>{m}</var></dt><dd>flat engine
    boxer engine
    horizontally-opposed engine
    <dfn title="Technology / Technik">tech.</dfn> pancake engine
    <dfn title="Technology / Technik">tech.</dfn> opposed cylinder engine
    <dfn title="Technology / Technik">tech.</dfn> opposed piston engine <kbd>[Am.]</kbd></dd></dl>Or, to be precise, an airhead has a luftgekühlter boxermotor. Which rolls off the tongue much nicer anyway.
    #12
  13. danedg

    danedg Horizontally Opposed

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    [​IMG]
    #13
  14. danedg

    danedg Horizontally Opposed

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    It was one of the LOUDEST motorads on site!:eek1

    [​IMG]
    #14
  15. danedg

    danedg Horizontally Opposed

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    [​IMG]
    #15
  16. danedg

    danedg Horizontally Opposed

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    True boxers have each crankpin controlling only one piston/cylinder while 180° engines, which superficially appear very similar, share crankpins.
    #16
  17. supershaft

    supershaft because I can

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    I would not be surprised if that came right out of Wikiwrongia since that statement is mostly all wrong. A 360 degree crank most often shares the crankpin like a Harley, Duc, or Moto Guzzi. 360 degree cranks can also have two separate crank pins like a Yamaha XS650, Triumph, or Norton or have the two separate crank pins crank pins 90 degrees apart like Yamaha 800cc vertical twins and some of the new Triumph twins for a 270 degree crank. Then there are crank pins 180 degrees apart like a BMW or a RD/RZ. In a vertical twin with a 180 degree crank one piston is going up while the other is going down. In an opposed twin with a 180 degree crank like our beemers both pistons go in at the same time and both go out at the same time hence the name "boxer". The pistons "box" at each other.
    #17
  18. danedg

    danedg Horizontally Opposed

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    [​IMG]
    #18