The Lotus Cars Community banner

141 - 160 of 188 Posts

·
Plug Whisperer
Joined
·
6,305 Posts
Discussion Starter #141
PS- Doors are OE.. not doing those anytime soon! lol
 

·
Registered
Joined
·
3,909 Posts
Getting closer...

Carbon widebody clams back from paint. Rockers, front and rear clam, side filler/hinge covers, rear hatch (notice no holes for better areo), and hardtop are all carbon..... Needless to say, they don't weigh much!

Little bit of fitment work due to many custom features of this particular car :cool:

-Phil
I've been wanting to tie some strings to a friend's Exige to see what kind of airflow that mesh allows for. I have a feeling that the standard Exige is much less "fastback" than we'd think, so it is cool to see a real fastback design!
 

·
Plug Whisperer
Joined
·
6,305 Posts
Discussion Starter #143
I've been wanting to tie some strings to a friend's Exige to see what kind of airflow that mesh allows for. I have a feeling that the standard Exige is much less "fastback" than we'd think, so it is cool to see a real fastback design!
I'm quite certain that it is near impossible to keep air attached very well to the mesh on the hatch... So I would agree with you! Turbulance City.
 

·
Premium Member
Joined
·
510 Posts
Crazy aerodynamics. Car has enough Down force to sit upside down.

That's impressive phil.

Or my smartphone isn't so smart.
 

·
Illegal Alien
Joined
·
4,716 Posts
I've been wanting to tie some strings to a friend's Exige to see what kind of airflow that mesh allows for. I have a feeling that the standard Exige is much less "fastback" than we'd think, so it is cool to see a real fastback design!
As a past life in Hydro/aerodynamics the mesh hatch would have no flow attachment. If flow happened to follow that profile it would have been from sugnificant flow modeling by lotus placing the mesh at the point of natural vortex turbulence line as if the hatch wasn't even there. The mesh along with flow bleed out the bottom is equal to just truncating the car as flow pressure differentials common between upper and lower surfaces have been cut off with bleed through connector. Now some trick aero could be done to create a suction down on the grill by energizing suction out bottom vents and the diffuser, this would bend the top surface air down better to flow into the air dam but as designed the grill is much to large to gain this flow messaging benefit. Phil did right to fair the rear hatch in.
 

·
Registered
Joined
·
3,909 Posts
As a past life in Hydro/aerodynamics the mesh hatch would have no flow attachment. If flow happened to follow that profile it would have been from sugnificant flow modeling by lotus placing the mesh at the point of natural vortex turbulence line as if the hatch wasn't even there. The mesh along with flow bleed out the bottom is equal to just truncating the car as flow pressure differentials common between upper and lower surfaces have been cut off with bleed through connector. Now some trick aero could be done to create a suction down on the grill by energizing suction out bottom vents and the diffuser, this would bend the top surface air down better to flow into the air dam but as designed the grill is much to large to gain this flow messaging benefit. Phil did right to fair the rear hatch in.
This is exactly why I'd want the string test: see if the airflow follows parallel or normal to the mesh. And, if normal, in or out. Given the pressure gradients you mentioned, I'd bet the airflow follows a very similar pattern as the Elise, yet people mount the wings in entirely different places. I doubt Lotus' modelling would be accurate enough anyways for the mesh to happily coincide with the airflow. but enough conjecture, I'd say Phil's design does what Lotus alluded to but did not achieve.
 

·
Illegal Alien
Joined
·
4,716 Posts
String test is the most practical test method. I would suspect flow is not singularly tangential or perpendicular, but rather a vortex eddy shedding showing flow moving both in and out as it rolls to the back.
 

·
Registered
Joined
·
3,909 Posts
String test is the most practical test method. I would suspect flow is not singularly tangential or perpendicular, but rather a vortex eddy shedding showing flow moving both in and out as it rolls to the back.
The mass of the string serves to dampen out some of that, so it can give you a picture of the time-average flow in the case of vortex shedding. Also, if it is really dancing, then it may tell you nothing about the airflow except not to place a wing anywhere near it, haha
 

·
because racecar
Joined
·
540 Posts
Maybe I missed it but how much downforce does that wing actually make, or is anticipated to make? For 12k$ yowza.

I am within a week or so on completion on a dual element swan neck wing that is coming out to much less than that and I can't imagine it making less downforce
 

·
Plug Whisperer
Joined
·
6,305 Posts
Discussion Starter #151
Maybe I missed it but how much downforce does that wing actually make, or is anticipated to make? For 12k$ yowza.

I am within a week or so on completion on a dual element swan neck wing that is coming out to much less than that and I can't imagine it making less downforce
lol. $12K, if/when I said that, was a joking. My wing is realistically about a 3500-4,000 setup all in.... hard to say exactly with mounting, etc...

As for downforce, I bent the frame with it... Straightened and fish plated to prevent in future. Prior to that I bent the aluminum uprights I made for it... Switched to 14 ply CF with 1/2" honeycomb core and no problems with those after a couple seasons... weigh like nothing too:up: I've had 3 guys standing on the wing to "stress test" the mounting setup and lateral stength... It's a HUGE wing, but very efficient... Had to switch to 1100lb rear springs to keep the rear end from squatting too much at "speed".... The car regularly sees 140-150mph (actual not indicated) on the straights...


-Phil
 

·
Plug Whisperer
Joined
·
6,305 Posts
Discussion Starter #153
Is the car going to be running the track day? It would be nice to see it running on the track
Maybe! I'll have to see how the schedule pans out, energy, etc. Will bring it up there (for LOG)... If I can swing the time and etc, It would be fun... An exibition run on a speedway roval at a club event like that is kind of a tricky thing to do for both me and that car...
 

·
because racecar
Joined
·
540 Posts

·
Plug Whisperer
Joined
·
6,305 Posts
Discussion Starter #155
As a past life in Hydro/aerodynamics the mesh hatch would have no flow attachment. If flow happened to follow that profile it would have been from sugnificant flow modeling by lotus placing the mesh at the point of natural vortex turbulence line as if the hatch wasn't even there. The mesh along with flow bleed out the bottom is equal to just truncating the car as flow pressure differentials common between upper and lower surfaces have been cut off with bleed through connector. Now some trick aero could be done to create a suction down on the grill by energizing suction out bottom vents and the diffuser, this would bend the top surface air down better to flow into the air dam but as designed the grill is much to large to gain this flow messaging benefit. Phil did right to fair the rear hatch in.
Thanks, Julian. I don't have the past life, but from what I've seen, the air back there is a wreck.

Would be nice if I will be able to run less wing angle and achieve similar DF with cleaner air over the whole foil now that I have a cleaner body line... My car makes copious amounts of DF, but now it's time to reduce the drag... A bit less drag and I'll have more flexibility to change classes by changing the tune on the car and still have something that can be pushed through the air. The goal is to be able to class down or up depending on the entry list (more cars pay more tires for the W). To class down, the car has to be slippery due to loss of power...

-Phil
 

·
Plug Whisperer
Joined
·
6,305 Posts
Discussion Starter #156
Race this weekend...

... making progress with many, many, many 18 hour days...

Someone mentioned pulling out all the stops. I believe we can check that box...

Our widebody carbon clams are fitting well. New splitter is "hella durable".

Gone is the red. I knew red was temporary since it really has nothing to do with BOE livery. THe blue was a big gamble, as I got like no support from... well, anyone... I think it turned out OK! Matches the cage well and really has some pop...
 

Attachments

·
Registered
Joined
·
433 Posts
Great work ... And the colour looks great , can't believe you didn't get any support !!
Look forward to hearing how it goes ...
 

·
...call me a space cowboy
Joined
·
252 Posts
Gone is the red. I knew red was temporary since it really has nothing to do with BOE livery. THe blue was a big gamble, as I got like no support from... well, anyone... I think it turned out OK! Matches the cage well and really has some pop...
Blue looks good! Of course I'm slightly biased:coolnana:

Can't wait to see it and HEAR it!!
 
141 - 160 of 188 Posts
Top