Hollow Endplates

[nuconcept]

Long time reader, first post, so please be gentle!

With the confirmation of hollow end plates being legal, what ways do people think this can be harnessed?

I had the thought that since all teams have the bleed slots on the rear wing anyways, that the high pressure air could be channeled somewhere else, like to the bottom of the end plate, and dump out the front facing edge to create a seal like the exhaust from last year.

Any thoughts on this?

Thanks.

[Lycoming]

Not enough energy in the flow. To do things like that is not really feasible with ducted flow, it requires something with more momentum. Exhaust flows, considering they aren't required to use mufflers or anything like that, have a considerable amount of energy.

About the only thing that this sort of flow seems to be good for is stalling wings by slot blowing, though that isn't to say its the only thing it can actually be feasibly used for.

[hardingfv32]

The pressure is not very high, about .1 PSI.

Brian

[nuconcept]

Its enough to create con trails at 1 psi?

Why doesn't that sound right?

Even if it was a duct that pulled the air from the top corners of a closed drs, you still say its that low of a pressure?

I will defer to those that know the math, it just seems like there is far more there than that.

[Lycoming]

the pressure difference between the high and low pressure regions of the wing is much, much greater than the pressure difference between the high pressure region and whatever the ambient pressure may be at the point where you are injecting it. in addition, you get a lot of losses going through ducts.

[nuconcept]

I follow that so far, but wouldn't the duct also have very low pressure if the other end is open and in a low pressure area?

I'm guessing you would lose downforce if you were sucking air off the top of the wing anyways, woo thanks for your answers.

[hardingfv32]

I follow that so far, but wouldn't the duct also have very low pressure if the other end is open and in a low pressure area?

-.15 to be exact.... Does that sound 'very' low?

Brian

[wrcsti]

That wing has nowhere near the AOA that a regular rear wing does

[hardingfv32]

Any data to show how much the difference would be?

Say we double the AoA attach, then we double the numbers I stated? Are you more comfortable with -.3 PSI on the low side or is that still too low for you?

Brian

[n smikle]

There are other high pressure sources. The reason mercedez chose the RW DRS is because they only want the front wing to "stall" during DRS usage. They could have routed pipes from any where else but it just would not activate in a controlled manner.

Lets say we duct the endplates as suggested, what is the plan?

[MemroableC]

All it needs to do is activate a fluid switch (like the original Fduct) and the air for the front wing could come from any other opening in the car.

[MIKEY_!]

You could certainly F-duct the outer sections of the wing. It won't have anything like the power of the original F-duct and it would have to be fluid switch operated but it could be useful.