Maybe the gain would be minimal and probably the increased surface would cause bigger drag and maybe more disturbance to the flow downstream. Consider also that the effect of the endplate is a redistribution of the lift on the span, basically a virtual increment of the aspect ratio, hence of the span. As I’ve said above F1 rules actually impose a maximum width in that area but only BAR is apparently using the full span, others could easily increase it if required. Ferrari did the opposite, reducing the span in Imola compared with the previous model and keeping the same short span also in Monaco. That suggests that the increment of span would carry little benefit if any. Then I’ve a little voice in my head saying that it’s no coincidence that the width is about the same of the camera housing just above itAsphodel wrote: I think it is strange that the mid mounted wing on the Ferrari doesn't have endplates. Wouldn't it make the wing more efficient by stopping the air spilling around the end of the wing. I am open to any ideas of why they don't do it. Is there something in the rules?
The usual motivations to use the winglets at the tip on airlines are :Monstrobolaxa wrote: that is why most airliners now have winglets on the end of the wing...
- Reca2. Airports requires to pay a tax that is related with the size of the airplane and based usually on the span of the wing. The winglets allows to mimic an higher aspect ratio (larger span) without actually increasing it.
20% less area means a 20% higher Cl, that can’t be due to the winglet alone, that’s the effect of an overall new design. Manufacturers always work to reduce the area of the wing or, better said, to increase the wing load (weight / wing area) one of the reasons being that it reduces the sensitivity to the turbulence but obviously also the reduced dimensions of the wing (hence of its weight) is a pro. Then you have just to find room for the fuel...Monstrobolaxa wrote: with the introduction of the winglets Boeing was able to to reduce the wing area by 20% due to the lift gained, in the 747
That’s indeed the effect of the winglet, the reduction of the vorticity you previously mentioned is just the same thing, an effect of the reduced mixing. And clearly that’s the same effect you have increasing the aspect ratio of the wing, a reduction of the induced drag and a modification of the distribution of lift across the span. I didn’t say that the winglet doesn’t work, I just said that it’s the solution used mainly if there are limitations to the span.Monstrobolaxa wrote: In the previous post I also forgot to mention that the winglets also prevent the airflows from the top of the wing and bottom from mixing thus producing a reduction in the lift and increasing the drag.
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