Ultima Group C
Discussion
Love it bud.... only thing I would comment on is the rear diffuser. I started to build a very up swept unit like that and was told by a few people that I trust that 2 high a angle change will stall the air very quickly. Best to be as gradual as possible. My first unit had a effective angle of about 14deg (not a constant as it was swept up in a curve) but have revised it down to about 8.5 degs now. To keep that lovely depth at the back of the diffuser close to what I had, I ended up bringing the starting point forward to the bulkhead. Its length is now over 1.7 meters, straight and kind of boring but will work way better... I'll dig out a pick..
Hello my friend, I was anticipating your input and recall the conversation. All I will say in response, and please pardon me if I am not going to try and reply with a long engineering answer.
SAUBER DID IT.
Somehow Sauber was able to create thousands of pounds of down force with their tunnel system on the c9 and c11. Their system has an angle of ~18-20 degrees. I'm sure a closed tunnel is an entirely different animal from a diffuser. Either way, that is why I choose to copy their design and not reinvent the wheel. The two cars are not that far apart and in the end I'd rather have to take out down force to balance the car then try to add more. the other thing to note is that Sauber had a very Wing-Like surface on the front of both the c9 and c11 which I could add to the GTR down the road. I am not too fond of the look so for now we'll leave the front clip alone.
Chris
http://www.mulsannescorner.com/aerodatabasesauberc...
SAUBER DID IT.
Somehow Sauber was able to create thousands of pounds of down force with their tunnel system on the c9 and c11. Their system has an angle of ~18-20 degrees. I'm sure a closed tunnel is an entirely different animal from a diffuser. Either way, that is why I choose to copy their design and not reinvent the wheel. The two cars are not that far apart and in the end I'd rather have to take out down force to balance the car then try to add more. the other thing to note is that Sauber had a very Wing-Like surface on the front of both the c9 and c11 which I could add to the GTR down the road. I am not too fond of the look so for now we'll leave the front clip alone.
Chris
http://www.mulsannescorner.com/aerodatabasesauberc...
I like it! I think you should look into the old GTP cars. Those cars had huge tunnels of many shapes and sizes.......
I don't recall seeing these CADD models. What are you going to charge me for the LS engine model? -Mine is very basic. I also have a Bus transaxle if you are interested.
Chris
I don't recall seeing these CADD models. What are you going to charge me for the LS engine model? -Mine is very basic. I also have a Bus transaxle if you are interested.
Chris
Hi Chris sign up to Grab Cad bud...
Rough G50 Gearbox but better than nothing..
http://grabcad.com/library/porsche-g50-space-model...
Very Good Engine Model...
https://grabcad.com/library/chevy-ls3-6-2l-1
Enjoy....
Rough G50 Gearbox but better than nothing..
http://grabcad.com/library/porsche-g50-space-model...
Very Good Engine Model...
https://grabcad.com/library/chevy-ls3-6-2l-1
Enjoy....
3750 cubic inches is over 16 gallons same as a stock Ultima. The only track time that this car will see is track days 30 minutes at a time so even at 4 mpg you have plenty of fuel. The advantage of the center tank is way to big to give up on the idea Chris gp back and take a harder look at the space between the back of the stock seats and the existing fire wall. I know you can get 16 gallon without impeding on your space for the pulleys because I have already done the sums awhile back. Come on Chris get that brilliant engineers brain engaged. Lee
If you can't avoid "steep" effects tunnels, then you can slot the leading area and use a small electric fan to "activate" the duct (ie, suck out the boundary layer at the transition, to help keep the flow)
However, if you do manage to get significant rear downforce, you will soon find that the front of the car becomes a significant issue. Of course, the modern way is to use lower surface effects to limit lift without having to fit a conventional high drag rear wing. But you probably still want a massive wing because it looks cool! ;-)
However, if you do manage to get significant rear downforce, you will soon find that the front of the car becomes a significant issue. Of course, the modern way is to use lower surface effects to limit lift without having to fit a conventional high drag rear wing. But you probably still want a massive wing because it looks cool! ;-)
Man this looks cheap when you consider how much it costs to build an Ultima for track use.
http://racecarsdirect.com/listing/58321/aquila_cr1...
Paul
http://racecarsdirect.com/listing/58321/aquila_cr1...
Paul
hi,
Reading this thread with interest as my Ultima already has many of these mods including an active rear wing.
This is the 3rd Ultima I have owned and is by far the best handling and quickest due to the modified suspension, all the aero changes and a stiffer chassis etc. - it does make a big difference particularly at high speed.
As soon as the weather is suitable, I will be taking some photo's as I am selling her in the near future.
Martin.
Reading this thread with interest as my Ultima already has many of these mods including an active rear wing.
This is the 3rd Ultima I have owned and is by far the best handling and quickest due to the modified suspension, all the aero changes and a stiffer chassis etc. - it does make a big difference particularly at high speed.
As soon as the weather is suitable, I will be taking some photo's as I am selling her in the near future.
Martin.
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