More aerodynamics?

Discussion in 'General' started by fastfreddie, Sep 1, 2020.

  1. CB186

    CB186 go f@ck yourself

    They tested the dimple theory on Myth Busters(if I recall correctly). They covered a car in clay, tested MPG, then cut dimples into the clay and tested it again. They found an increase in MPG.
    Funkm05 likes this.
  2. turner38

    turner38 Well-Known Member

    Maybe Arai should come out with a dimpled helmet since they are pretty close to round!
    TurboBlew likes this.
  3. rabbit73

    rabbit73 Scheiße

    Can we put a golf ball on a treadmill to test it?
    auminer likes this.
  4. fastfreddie

    fastfreddie Midnight Oil Garage

    You jest, but helmets may be a better place to explore the possibility of any benefits.
    Sabre699 likes this.
  5. Raceless man

    Raceless man Well-Known Member

    Fighter jets don't have dimples...i think there was a test plane once with thousands of holes drilled into the wings... No significant performance increase at all...much maintenance though as all those holes needed cleaning after every flight.
  6. Sabre699

    Sabre699 Wait...hold my beer.

    Nah..needs to be in a hovercraft on a moving train.
  7. Raceless man

    Raceless man Well-Known Member

    I think dimples in your helmet will eventually apply dimples to your skull.
  8. IrocRob

    IrocRob Well-Known Member

  9. fastfreddie

    fastfreddie Midnight Oil Garage

    Supersonic speeds exceed the parameters within which dimples have effect.
  10. OGs750

    OGs750 Well-Known Member

    Jets already have a form that the dimples are trying to replicate.
  11. Robby-Bobby

    Robby-Bobby Steeltoe’s Daddy

    I will volunteer to help any racer Dimple their tanks. Free of charge.
  12. Sabre699

    Sabre699 Wait...hold my beer.

    The open face guys had 'em...

    TurboBlew and Phl218 like this.
  13. cha0s#242

    cha0s#242 Ignorance and prejudice and fear walk hand in hand

    Speed holes. Makes it go faster.

  14. stangmx13

    stangmx13 Well-Known Member

    in racing, helmets likely see unmodified flow only during braking when the rider pops up. dimples might make a measurable difference then... but you want to slow down so whats the point. all other times, the helmet is likely already getting modified somewhat turbulent air. so theres probably no need for dimples.

    we cant forget about relative magnitudes here. dimples on a golfball reduce drag by a significant percentage, maybe as high as 50%. this has a comparable effect in performance because drag is the primary component. there no way in hell dimples on a motorcycle or helmet will have anywhere close to that affect. id guess a 0.1% change in drag (or less), which is an even smaller performance change because theres so much more that goes into racing performance. if Yamaha had the choice of spending 100 man-hours researching and implementing dimples vs increase their engine performance, they absolutely should go with engine performance.
  15. fastfreddie

    fastfreddie Midnight Oil Garage

    You're lacking capitalist imagination..."Three wacks for a dollar!"

    It's amazing how difficult it is to damage a motorcycle with a sledge hammer, but one toss down the track and they virtually explode. Kinda gives ya an insight to the forces at work...
  16. notbostrom

    notbostrom DaveK broke the interwebs

    Even flow by Pearl jam?
  17. notbostrom

    notbostrom DaveK broke the interwebs

    Honda had the stickers with zigzag threads at Daytona years back
    Stumpy likes this.
  18. fastfreddie

    fastfreddie Midnight Oil Garage

    Enzo Ferrari would agree - "Aerodynamics are for people that can't build engines."
    You might want to have chosen a different manufacturer to make your point, tho'. :D
  19. ChemGuy

    ChemGuy Harden The F%@# Up!

    That wasn't quite the same as dimples. They were trying to control the boundary layer and keep the flow attached though.
  20. stangmx13

    stangmx13 Well-Known Member

    We know Yamaha's engine performance is teh suk right now. That was the point though. In racing, it is often better to improve your disadvantages over furthering your advantages as that will gain more performance due to diminishing returns. Pursuing an unknown might be worse, or you could get lucky and it could be better.

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