decklid mock-up photos

[moonmonkey]

i want to do what ever will get me the most fe, i am trying to model it after the fusion 999 , but if i angle it like my stock trunk line it would not hit the 15 degree angle until way behind the car, if i level it out even and raise it two and a quater inchs higher than the stock trunk lid it will intersect with the template at around 14 inches behind the trunk lid, im going to also taper it a little as it goes back,i found a post with you guys talking about this,, but do i need to put those vertical peices on ,i was going to make them even with my trunk lid width like the fusion, if it will help alot i could also put a kammback at the top of the rear window would they work better together? (so to simplfy this as im maybe not being clear i want to put the same rear wing assembly as on the fusion 999 on my 2 door echo, only if it is the best thing i can do for fe.( i cant do a boat tail my driving is to mixed city/highway) looks are not important.thanks for all the input i really like this site.

[Frank Lee]

I haven't built one for real so I'd copy the Fusion design as that one has been tested and proven.

[moonmonkey]

but do we know that its built for fe(reduced drag) or could it be a compromise design that is there for stability/downforce at high speed. the chart that shows the aeromods they did and the corrosponding cd advantages does not even list the rear decklid.could a "uglyback" at the top of my rear window work in synergy with the deck extention by attching flow sooner? then i could angle the decklid slightly downward and not have to make it 3 feet long that would allow the decklid to still reattach flow and angle slightly downward creating a smaller rear area to the drag, as well as not blocking my view as much. yes it would not look as cool (but im not trying to pick up chicks ,,,its an echo! as soon as i get a design that works i will cut and weld some aluiminum plate for a perminant one .

[Tygen1]

Moonmonkey, seems were on similar pursuits: http://ecomodder.com/forum/showthrea...2-11266-4.html reference post #35
I will most likely be testing a strait out extention next.

[moonmonkey]

im no aero guru for sure but would'nt a spolier that was around zero degrees, in other words even with the horizon be less drag?.it would just stick off the back of the car alot further so as to let the imaginary line hit the extended deck lid and reattach. it should also present a smaller area for drag behind the car.,like the fusion 999, im tring to get some more advice before i mock it up, i;ve got an auto aerodynamics book coming but would like to build this thing yesterday, i was looking at your post last night i've been scouring the net and this site for info (not alot of resources that are specfic enough for a rookie ecomodder like me,on this particular mod anyway.

[moonmonkey]

tygen1 ,if you get yours built and tested first id be very interested in your aba im going to try to get mine done in the next week or less operative word is try, as soon as we find a design that works im going to get some thin aluminum plate and weld mine up , the wife's gonna hate it! thanks for your effort, all that aba is a pain.

[aerohead]

Originally Posted by moonmonkey

i want to do what ever will get me the most fe, i am trying to model it after the fusion 999 , but if i angle it like my stock trunk line it would not hit the 15 degree angle until way behind the car, if i level it out even and raise it two and a quater inchs higher than the stock trunk lid it will intersect with the template at around 14 inches behind the trunk lid, im going to also taper it a little as it goes back,i found a post with you guys talking about this,, but do i need to put those vertical peices on ,i was going to make them even with my trunk lid width like the fusion, if it will help alot i could also put a kammback at the top of the rear window would they work better together? (so to simplfy this as im maybe not being clear i want to put the same rear wing assembly as on the fusion 999 on my 2 door echo, only if it is the best thing i can do for fe.( i cant do a boat tail my driving is to mixed city/highway) looks are not important.thanks for all the input i really like this site.

moonmonkey,I think what you're doing will work.I would recommend you attach end-plates on each side to close the opening up underneath the foil.

[moonmonkey]

as it is written so shall it be done! (said as beavis or butthead) thanks aero, just looking for that conformation.( photos and testing ,to come soon )

[VWCw]

Originally Posted by moonmonkey

but do we know that its built for fe(reduced drag) or could it be a compromise design that is there for stability/downforce at high speed. the chart that shows the aeromods they did and the corrosponding cd advantages does not even list the rear decklid.

from one website i found about the fusion 999, they only talk about the decklid extension as a spoiler for stabilization.


"Drag reduction of the Ford Fusion 999 was a key element of the successful world record attempt. By taking advantage of CFD analysis, physical test times could be reduced and multiple configurations of the vehicle studied. Other benefits included insights such as adding a rear spoiler for stability,”

[aerohead]

With the clock ticking,I'd recommend just sticking with your plan.I can think of 'embellishments' but they would really complicate fabrication.
Since it's going to stick out that far,I might recommend 'softening' the perimeter with say,a stiff urethane foam rubber to cushion a blow,should some unwary pedestrian walk into the thing.Like foam knee pad material at the gardening center.
Some sort of simple C-pillar buttress extensions on the top of each side could add some stiffness to the edges of the wing and also frustrate longitudinal vortices attempting to spin up in this region where slower side flow mingles with faster flow coming off the roof.They would make opening the trunk more difficult due to interference.Anything you could do would help.
And a parting remark.If you were to create parallel inset panels which hang below the wing,straight down,of which the trailing edge to the side of the car defined,say,an 7-8 degree angle,you would have a simple boat tail extension which has already demonstrated effectiveness on 18-wheelers and on my T-100.
I'll shut up,you've got enough to do.Happy modding!