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  • Gurney Flap

    Had some requests to post up what I've done for the Gurney Flap on the rear trailing edge of the stock rear wing.
    I made it out of aluminium tile edging from Bunnings. It was only supposed to be temporary so I could work out heights etc before cranking some out in CF. It sits about 15mm high at the moment but I'm planning to make one about an inch high.

    The design of the Gurney Flap apparently works best at about 1% chord width of the wing it's fitted to. As the stock Colt rear wing is flush mounted with the roof of the car you can effectively use the whole roof as the chord width. Theoretically that works out to around 25mm high flap with a roof length of 2.5M roughly.
    If you have a 'slotted' rear wing sitting up off the roof line your chordwidth is a lot less but you get better airflow due to the 'slot' allowing air into the low pressure area at the rear of the car.

    There's plenty of conjecture about the how's and the why's but I think the one I have works at speeds above 80k/h so I leave it on there.

    Some photos:

    Stuck it on with this stuff:

  • #2
    just found this post!