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  1. #21
    Official RnS Addict philhrc's Avatar
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    Quote Originally Posted by Dragsterbus View Post
    It's nothing like mine ! mines about half the height ! (and an sfi 2.1k tag)
    and mine's a pick up (sort of)
    theres an understatement

    how's it going dude ?

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  3. #22
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    Quote Originally Posted by billyboy132 View Post
    In all honesty, u are always going to struggle making a flat fronted vehicle aerodynamic (im sure we all figured that!!). A chin spoiler and bringing the front bodywork down as low as possible will help but id say some weight over the front end will be the only real answer to keeping the front end down and stable. The biggest problem you have is large surface areas, both the slab sides and the roof. As Lucky777 says, the air holds on to these areas, and u need to get a seperated airflow somehow (think dimples on a golfball, they are there for a reason!!!) The best way is to bow the surfaces out, bit like the roofs on these modern artic trailers but i think that'd probably take the look right away from it!! The absolute worst area is definately the arse end where all the air from the sides and the roof grab a hold and jus wont let go, leaving a massive low pressure wake behind. The spoiler hangin off the back will massively improve this as will some corner plates down the sides as you see on the front of trucks (but you want them on the rear obviously), i think if you look at picks of the hooligan van he has used this idea too.

    Im afraid thats the best i have to say, (i didnt listen enough in aero at Uni!!)
    weight and aerodynamics become more of an issue the faster you travel.what youd not mentioned was at what part of your run the problems occur.if it is as you leave the line/get some power down then it wont be aerodynamics,(weight distribution,balance,rigidty,chassis set up etc are likely to be problem.
    if it is at speed,then of course all the above must be considered,but you are more likely looking aerodynamics.an incorrectly placed/angled spoiler can be more of a hinderance,possibly dangerous.
    as mentioned earlier,there are guys,john webster,andy robinson,chris issacs
    etc etc who do this kind of thing for a living.
    i think youd be best to give one of them a call.
    mick

  4. #23
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    oh yeah,just a quickie.i wasnt putting billyboys advice down,it is very accurate.its just that i would hate to see you come unstuck if something wasnt quite right.

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  6. #24
    Official RnS Addict philhrc's Avatar
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    Quote Originally Posted by mick gould View Post
    weight and aerodynamics become more of an issue the faster you travel.what youd not mentioned was at what part of your run the problems occur.if it is as you leave the line/get some power down then it wont be aerodynamics,(weight distribution,balance,rigidty,chassis set up etc are likely to be problem.
    if it is at speed,then of course all the above must be considered,but you are more likely looking aerodynamics.an incorrectly placed/angled spoiler can be more of a hinderance,possibly dangerous.
    as mentioned earlier,there are guys,john webster,andy robinson,chris issacs
    etc etc who do this kind of thing for a living.
    i think youd be best to give one of them a call.
    mick
    hi mick
    it run's ok and straight , til about half way up ,then it wanders in the breeze .......

    the main thing is the amount of weight i want to lose , and if it makes the problem worse .....


  7. #25
    Official Drag Addict.... BRIT DIGGER's Avatar
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    Quote Originally Posted by BRIT DIGGER View Post
    cool jim!

    thats what i was trying to say......same as wayne.....

    Sid.
    Quote Originally Posted by Dragsterbus View Post
    It's nothing like mine ! mines about half the height ! (and an sfi 2.1k tag)
    and mine's a pick up (sort of)
    Quote Originally Posted by philhrc View Post
    theres an understatement

    how's it going dude ?

    hey wayne, not you the other wayne lucky777...

    dude?.......... whatya like you dub boyz!!.....

    while were on the subject of potty vws trying to run straight, lets see some pics of yours wayne?..dragsterbus dude one....

    Sid.
    DRAG RACING IS A DISEASE FOR WHICH THERE IS NO KNOWN CURE.

    Oddlot Drag Racing Team....
    ............."havin fun is usual"

  8. #26
    Rods 'n' Sods Junkie billyboy132's Avatar
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    Quote Originally Posted by mick gould View Post
    oh yeah,just a quickie.i wasnt putting billyboys advice down,it is very accurate.its just that i would hate to see you come unstuck if something wasnt quite right.
    respect what ur saying, and your advice is definately a necessary input that i left out!! As i said, did study aero as a small part of my degree but didnt listen too good! (read: wasnt my favourite part of my degree! )

  9. #27
    Official RnS Addict philhrc's Avatar
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    Quote Originally Posted by billyboy132 View Post
    In all honesty, u are always going to struggle making a flat fronted vehicle aerodynamic (im sure we all figured that!!). A chin spoiler and bringing the front bodywork down as low as possible will help but id say some weight over the front end will be the only real answer to keeping the front end down and stable. The biggest problem you have is large surface areas, both the slab sides and the roof. As Lucky777 says, the air holds on to these areas, and u need to get a seperated airflow somehow (think dimples on a golfball, they are there for a reason!!!) The best way is to bow the surfaces out, bit like the roofs on these modern artic trailers but i think that'd probably take the look right away from it!! The absolute worst area is definately the arse end where all the air from the sides and the roof grab a hold and jus wont let go, leaving a massive low pressure wake behind. The spoiler hangin off the back will massively improve this as will some corner plates down the sides as you see on the front of trucks (but you want them on the rear obviously), i think if you look at picks of the hooligan van he has used this idea too.

    Im afraid thats the best i have to say, (i didnt listen enough in aero at Uni!!)
    i wish you'd payed more attention


  10. #28
    Official RnS Addict vin likes diesel's Avatar
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    anti roll bars work very well on a four bar , i know of two very quick cars owned by mates that will not take them off now.
    Pro Street Escort... MOT ready.
    Hug Street Morris Oxford mo.... unfinished, on its tenth set of wheels
    Custom truck ..MOT ready
    Dinner ....finished

  11. #29
    Rods 'n' Sods Junkie billyboy132's Avatar
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    Quote Originally Posted by philhrc View Post
    i wish you'd payed more attention


    http://www.airtab.com/en/

    An aerodynamic revolution!!, might be of some interest!!

    Apparently only 20% of drag on a square backed vehicle is caused by friction, ie. along the slab sides of the vehicle. The bulk of the remaining 80% is pressure drag, the vast majority of which is the low pressure at the back of the vehicle!

  12. #30
    Administrator blackpopracing's Avatar
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    The other area to consider is the underneath.
    If you can sheet over most of it then you will create faster airflow under the vehicle, creating downpressure as well.

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