Cheating The Reaper - Reply to Topic
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Topic Review (Newest First)

  • Yesterday, 22:28
    The science stands: planes for aerobatics have a very symmetrical wing profile. Any wing can fly upside-down with the correct angle of attack, it's just that the drag increases.
  • Yesterday, 16:26
    Austin Martin
    The theory as I understand it, is that the curve in the upper surface of the wing causes the air to travel faster over it creating negative pressure underneath; that makes an aeroplane fly, the bottom of the wing can be flat or even slightly curved either way, so for an aerofoil, to aid downforce turn upside down (of course aeroplanes can fly upside down making a slight mockery of the science!)
  • Yesterday, 11:17
    I'm not either. I'm ok with the different surface length creating different airspeeds over each surface causing lift/downforce depending on which way up it is, beyond that.....further reading required
  • 15-11-2019, 10:48
    I guess both are fine - I'm not an aero engineer but most drag race ones are concave on top (as is mine from Andy Robinson) so I assume the concave top provides more downforce than the flatter one?
  • 15-11-2019, 10:00
    Quote Originally Posted by blackpopracing View Post
    Very nice but really the top should be concave and not flat.
    Ah, but the small Gurney flap on the back of the wing confuses the air into thinking it's concave.
    Anyhoo, I guess it worked well enough for Ralt!
  • 15-11-2019, 08:38
    What's the theory behind that ?

    Flat seemed to work OK for the Daytona & Superbird...

  • 14-11-2019, 23:37
    Very nice but really the top should be concave and not flat.
    You cant beat a wing on a Pop

  • 14-11-2019, 21:22
    Now that's nice
  • 14-11-2019, 18:16

    Winging it....

    It's been a while since I last posted. It's not that I've done nothing - far from it, but there are a couple of large-ish projects that are going on that don't really make sense until they look like what they're going to be. The first one of these is this.........

    I was rummaging around in my metal bin, looking for some alloy plate when I came across these:

    I've had them for at least a couple of years. They came to me in a pile of old Ralt single-seater stuff. It only occurred to me when I re-found them that they are wing fences.
    Well if that's not some divine being telling me that I should put a wing on the car then I don't know what it is. Fortunately the chassis already has wing support points on it (I thought there would be a wing eventually).
    So I made templates of the wing profile from the 'clean' bits of the fences, then transferred them to metal.

    Then added some edging metal - something nice to rivet to:

    Holding everything in it's relative position is this 16mm tube that is welded to the profile pieces

    Using a tube clamped to my bench I accurately (!) rolled the skin and started to rivet

    Profile is good. I've now got to make the wing mounts, and then fit those bloody fences that started it all!
  • 28-10-2019, 04:17
    "For this operation you will need a family sized yoghurt pot and some sticky-back plastic"

    Yeah! Yoghurt pot! What better thing could there be to mould clearance bulges for rocker covers?

    With the pots and sticky-back plastic removed there's plenty of clearance for the cam covers.

    And after they've been smoothed off a bit:

This thread has more than 10 replies. Click here to review the whole thread.

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