Vented bonnet & rear spoiler

[Petrus]

I am not missing any point, i am not interested in making my car lighter/more aerodynamic or racing, (although i would like a quicker 0 to 100 time) but i think driving down the road, not a race track, with a wing like that on the back in a standard mr2 would make me look like a right wally.. and i will say no more as i am getting away from the point..

Ah well in mý eyes the right wallys are the high end ´sports´ car buyers. Those who buy/do stuff because of perceived image. At least with an MR2 you cán drive spiritedly on the legal side of the speed limits.
And as I have been fined for drifting a lifted 4x4 even, you will get my drift 
Anyway, bonnet vents and rear Kamm thing are under way.

Seen SpyderLee´s project? It is all about the fún you have with your wheels.

Carpe diem; dare to líve; a3vt!

[Petrus]

simple and clear

https://www.youtube.com/watch?v=TKH1DyV9vNU

[Petrus]

the forecast for today and five more is 100% sunny = top down!!!!
Had an extremely ejoyable drive back trough the mountain this afternoon.
Tomorrow going down to the coast with it over the véry interior route. Hope to take pictures.
The idea is to take the Málageña blonde on the classic car run through the Axarquia on Saturday.Hope to take pictures.

Hope to fit the camber bolts on Monday. Am curious how much minus they will actually be able to give in the top hole. No pictures neccessary.

Missing the Sunday plan? Well the initial plan was to take mountain love to a cheese festival further still up into the mountains but she has a severe ccccccóld. Better take her comfy ´tank´. Still fun though with the pink/purple flower decals and purple glow under the car  No pictures.

Alas, no aero gadgets have arrived in the mountains yet  so no pictures of that either.

I assume you lot will be getting the picture? 

p.s. will be ordering a non-baseball cap under guidance of the Málageña as I bow to her taste.

[Petrus]

Unexpected update; Ducati tyre cooler.

In Moto GP all manufacturers will adopt a special air scoop to the underside of the rear swing arm because it adds downforce, giving more traction.
Picture this; it is effectively less than 10 cms. wide and sits under the fairing, in the wake of the front wheel: It cannot be in much of an air stream nor has much surface yet it definitely works and not just at top speed because the crux of the thing is that it helps gétting up to speed quicker.

Nów picture a 135 cm wide wing high up on the rear deck of the MR. Do you think it will have effect? 

[Nvy]

Unexpected update; Ducati tyre cooler.

In Moto GP all manufacturers will adopt a special air scoop to the underside of the rear swing arm because it adds downforce, giving more traction.
Picture this; it is effectively less than 10 cms. wide and sits under the fairing, in the wake of the front wheel: It cannot be in much of an air stream nor has much surface yet it definitely works and not just at top speed because the crux of the thing is that it helps gétting up to speed quicker.

Nów picture a 135 cm wide wing high up on the rear deck of the MR. Do you think it will have effect? 

I intend to add a scoop where the rear shroud ends to cool down an intercooler - porsche 992 style and if i have a wing it will help with downforce.

[Petrus]

As the free stream wind velocity was set to be 30m/s ~65mph, so rather relavant for real world speeds, I re-re-re-read this thesis and decided to push the button on a 135cm wide wing.

https://scholarcommons.scu.edu/cgi/viewcontent.cgi?article=1000&context=mech_mstr


I will leave the small lip in place and the wing faily horiziontal, minimising drag.
The idea is that the improved flow over the rear deck, underneath the wing will aument the downforce/negative lift.
The improvement is aerodynamics, i.e. reduction in petrol (15% less drag) use will be negligable; say 15% of 10% = 1,5%.
The increased stability (20% more downforce) has rather more of an impact because it is not a percentage of a percentage but directly of the downforce and because the potential consequences are so large.

[Nvy]

As the free stream wind velocity was set to be 30m/s ~65mph, so rather relavant for real world speeds, I re-re-re-read this thesis and decided to push the button on a 135cm wide wing.

https://scholarcommons.scu.edu/cgi/viewcontent.cgi?article=1000&context=mech_mstr


I will leave the small lip in place and the wing faily horiziontal, minimising drag.
The idea is that the improved flow over the rear deck, underneath the wing will aument the downforce/negative lift.
The improvement is aerodynamics, i.e. reduction in petrol (15% less drag) use will be negligable; say 15% of 10% = 1,5%.
The increased stability (20% more downforce) has rather more of an impact because it is not a percentage of a percentage but directly of the downforce and because the potential consequences are so large.

You got to give us some impressions and links after its installed. You need around 9 degrees angle from memory.

[Petrus]

You got to give us some impressions and links after its installed. You need around 9 degrees angle from memory.

You ´need´ what meets your goal(s).
Also this number is not the golden ratio for all wing shapes.
A wing shape gives a pressure differential at 0 degrees.
More inclination increases the differntial and the drag.
The 9 degrees is a sort of optimum where downforce and drag are at an optimum.

Bear in mind that the MR2 is a relatively light car so the downforce of the wing will have relative large effect. If you do not need the max./optimum downforce, a lower angle will give less drag.
Ditto avoiding unpleasant audible turbulence.

I am hoping that the small Kamm edge I have fiited will give more downforce with less angle = same downforce with less downside.

[Petrus]

The story continues.
Ordered/bought a rear wing.
It was not in stock and I was suggested a replacement.
That was no good to me.
Order was subsequently cancelled and money returned.

Used the time to look a bit further into it because the ´twisted´ design has gained a lót of ground in racing
The reasons are sound but it dictates a maximised width.
The combination with a boot lip imo remained a sound alternative idea to avoid the stall behind the mid section, something not feaseble in racing cars because those lack a trunk section. However, could not find any data.
Now I have:

http://trackdriver.com/blog/wp-content/uploads/2015/02/WingsOnSaloons.pdf