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Thread: Too much Turbulence on my 88 RS windscreen

  1. #31
    rsbeemer 22600's Avatar
    Join Date
    Jan 2011
    New Braunfels,Texas/Taichung, Taiwan

    +1 on stock shield

    I've ridden an rs for over thirty years and have tried all heights and the stock shield with the edging on it is the best.

    In the last few years I have gone to ear plugs and a better quality helmet than the ones I used to buy at walmart in my younger days.

    Stock shield, ear plugs and a quality helmet will be the best and look the best; putting a taller shield on an rs just doesn't do it for me.
    1978 R100rs MOA#22600 125cc Kymco , 180cc Kymco Racing King
    The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.

  2. #32
    Jim Carr
    Join Date
    Aug 2011
    Loleta CA
    Quote Originally Posted by saggs View Post
    JCARR, which model K75 bars are you running? Are they the C or S or ???Thx for the tips
    I think they are "S" bars. They were given to me by a friend that did not know.

  3. #33
    Huckleberry, Gilera &Toad kstoo's Avatar
    Join Date
    Jul 2007
    Burlington WI
    Quote Originally Posted by lkchris View Post
    There is simply no such thing as bolts/nuts that will break away in the fashion the rivets will. For sure you won't find them at Home Depot.
    The nylon nuts and bolts that come with the Parabellum, Clearview and other mfg 's are easily obtainable at any hardware store. The reason that they are used is to prevent cracking plexiglass by over-tightening and because they will breakaway when needed.
    1980 R100T (Gilera), 1982 R100RT (Toad), 1975 R60/6 (cern?ícalo)
    Adventures at the Cave

  4. #34
    Minnesota Nice! braddog's Avatar
    Join Date
    Jun 2003
    Twin Cities - MN
    Quote Originally Posted by Happy Wanderer View Post
    Well I guess I spoiled the lines on mine. The humanity! OH NO!!!

    I put bar backs on it, RT style larger mirrors and mirror extenders so I could actually see what's behind me and a tinted Parabellum medium height windscreen which actually works quite well. She slips down the highway real nice.
    That's what I have on my current RS and the S in RS clothing before her. It works well for me, too.
    Brad D. - Member #105766
    '77 R100RS - Black Beauty (big pipe, baby!)
    '94 R1100RS - Sylvia

  5. #35
    Curmudgeon nrpetersen's Avatar
    Join Date
    Sep 2004
    minnetonka mn

    I'm 6'4" - My R90/6 has no fairing & is the quietest ride of all - providing I use a neck gaiter to seal the area between my shoulders and the bottom of my Arai (and other full face) helmet(s).

    My R1100RT and K1200LT with stock fairings both give me an intolerable roar which is due to blow-off from the top of the firing hitting my helmet forehead. I arranged for a vibration expert where I work to analyze what is happening. He showed that the turbulent windstream hitting the forehead made the helmet bottom vibrate in the bell mode - i. e. the sides go in and out together while the front/back goes out and in together (read that again), at about 80 Hz. That explained why it sounded like the noise was coming from the very center of my head.

    What to do? - I'd like to try to increase the damping of that mode of vibration using an old helmet by epoxying a constrained layer damping ring all around the bottom of the helmet. This would use a ~3/4" wide ring of ~1/16" thick damping material (google Soundcoat) with a metal ring bonded to the outside of everything.

    Then my wife threw out all my old helmets & that was the end of that. I decided that maybe earplugs are the most practical solution.

    There are three sources of helmet noise. 1) the bell mode of vibration, 2) shoulder gasket (for unfaired bikes), and 3) general beating around of the helmet shell with random gusts.

    I considered the possibility of active noise suppression such as are used in aviation headsets, and suggested the same to Headsets Inc, but was unable to get a response. The Headsets Inc scheme is analog - not digital - which is the only way to approach our random noise problem. They are limited though to below about 200 Hz and the reduction is only about 10 to 20 db. I don't think that is enough reduction to allow us to remove the ear plugs.

    Which is where I started. Different helmet manufacturers don't seem to make much difference. They all claim silence and none of them are.

    It is an interesting problem.
    Retired w 2005 K1200LT, 2000 R1100RT, & 1975 R90/6

  6. #36
    Total Freak mikegates's Avatar
    Join Date
    Jul 2006
    Holly Man Nice Bus!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!
    95 R100Rt, 07 650 GS
    Eagle, wi
    "He's gone and nothin gone bring him back"

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