8 thoughts on “Silverstone: McLaren Blown Diffuser

  1. Do you reckon it was too sensitive?, heat problems?, Not enough downforce? or just hard to get to grips with the set-up with it?

  2. I think the major problem with McLaren’s EBD is anon-constant flow of exhaust gases feeding the diffuser. The car was becoming very unstable during Friday practice sessions under braking for the slower arena section.

      • Exactly, Hamilton was tossing it on corner entry, which is exactly where you would expect the sudden reduction of downforce to occur, as he came off the throttle. Encouragingly, it looks like they are blowing a lot more flow THROUGH the diffuser than RB – their slots were much much larger. I would imagine more gas through the diffuser means more throttle sensitivity – so this engine mapping trick might help them out even more.

  3. The pipe exit at 90 degrees is very poor design that ignores the entire history of coanda effect blown flaps.
    You want the flow to be wide and thin and attached to the surfaces (“boundary layer”) as much as possible in order to drag the larger bulk of air above the surface along.
    And you would want to do this blowing so that when the blowing is unavailable, the wing still works as well as possible, when this 90 degree pipe is off then it produces vacum drag and also turbulance which would disturpt the all sacred boundary layer. The flow output should be as parralell to the exisign flow as can be arranged. I belive the red bull uses somthing in the spirit of a backwards NACA duct in a place where the flow would fill the “base” or vacum drag of the tapering sidepods.

    Of course in stalled flow turblence can crudely renergize the boundary layer to a high drag thick condition, but this wing is not stalled as it is not the “lift” side of the wing. It is the “underside” of an equivalant aircraft widn such as the C-17 which uses engine thrust to blow the flaps from the underside. however there are slots that allow the blowing to be directed to the “top” on the flaps of the C-17 and most aircraft. blowing only the “bottom” side of an aircraft wing is unusual, I cannot think of a specfic example.

  4. Pingback: Blowing Diffuser – zasada dziaƂania « Technika F1 – Blogownia

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