Mary Barra on aerodynamics

[M_a_t_t]

Originally Posted by Tahoe_Hybrid

expensive battery change Resale value hahahhaha lmao,....
zero

Resale value only counts if you plan on selling it or if it was an expensive car in the first place

Slightly off the off topic stuff:
Almost all the posts (I see) you make are about how your tahoe is better than someone elses. Its not really a race, we try to work together to make our cars better, not berate somebody on their choice of a vehicle.

For example:

My 95 astro could get 22 on the highway and 24 in town in "v6" mode (stock form). I've bought 20 ft boards and put them in the van. I could close the hatch in the back with 4x8 sheets of plywood and 10 ft boards inside as well. 5500 lb towing capacity on top of that. Paid $500 and spent about 100 in heater core and master cylinder to fix it.

Interestingly enough my 95 mercury could easily fit a 12' board inside and seats 5 (the same or only 1 less than say.... an 08 hybrid tahoe). Paid $750 ran and drove fine.

Expensive battery? Your replacement is ~$2500.
Mine is at most (top of the line kind of price) $250

If you want to sit here and clog up a thread with why a car is worse than another you should probably just start your own thread and debate it there.

P.S. If you didn't notice, this post's value wasn't worth the effort reading it.

[Hersbird]

So speaking of GM products, and open body aerodynamics, I came across this video the other day. This is a C5 Corvette with a twin turbo 427 that will run 185 mph in a standing 1/4 mile, but without a body. I saw it run and just watched it fall flat at the end of the track and this video explained why. At just 170 mph the wind tunnel tech said it was over 500 hp lost on just the terrible .75 something Cd. Dude needs to put a body on that thing!

https://youtube.com/watch?v=1X35-bGWpEY

[kach22i]

Originally Posted by aerohead

As Hucho has said ,there's a lot of design latitude going down to Cd 0.25.Below that,one has to begin to respect Frederick Lanchester's shape of the 19th-Century.

I did the same thing Freebeard did, looked up that name, and even before I saw his posts.

Frederick Lanchester — An untold history of Aeronautics & Aerodynamics
https://medium.com/@anthonyhughes_64...s-d77b582d16f4

Frederick Who?

Frederick Lanchester (1868–1946)was an English engineer/ inventor. He was, by any definition a polymath — a creative genius also ahead of his time and often struggling to get the ‘establishment’ to catch up or take notice.

Apart from inventing pretty much everything in modern day cars (disc breaks, power steering, 4 wheel drive, suspension systems, worm drive, turbo charging, the first petrol-electric hybrid car etc — oh and we have the terms Top Gear and Dashboard courtesy of Fred) he also worked on pioneering inventions in colour photography, the first outboard motor boat, electric sound amplification and powered flight for which he publishing the theories of Aerodoneticsand Aerodynamics that would inform the basic principles of these areas of research, development and industry we know today. Indeed just one glance at his design for the powered flight aircraft with contra-rotating propellers in 1897! compared to the other designs for airplanes, will demomstrate the true nature of his vision and just how ahead of his times he really was (More of that later)

And along the way discovered this amazing NASA PDF too.

https://www.google.com/url?sa=i&url=...AAAAAdAAAAABAG

[aerohead]

Originally Posted by Hersbird

So speaking of GM products, and open body aerodynamics, I came across this video the other day. This is a C5 Corvette with a twin turbo 427 that will run 185 mph in a standing 1/4 mile, but without a body. I saw it run and just watched it fall flat at the end of the track and this video explained why. At just 170 mph the wind tunnel tech said it was over 500 hp lost on just the terrible .75 something Cd. Dude needs to put a body on that thing!

Seems like,in drag racing,they'll figure the proportion of the total pass at speed,versus power-to-weight ratio.If the car is only going to be at high velocity for some small fraction of the distance.They're willing to take the aero hit,to optimize weight savings,maximizing acceleration potential.
At Bonneville,HOT ROD Magazine's Camaro had to develop 150-hp just to push the exposed supercharger through the air at the speeds they ran.

[redpoint5]

Yeah, but a fiberglass shell can be tens of pounds. Better to do aero in lightweight materials than have none at all.

Oh, and happy Wednesday!

[Hersbird]

The no body Vette is it's "hook". Cletus McFarland is an entertainer more than a drag racer. There will be 50 cars that fast at the track but the one without the body is interesting. I do really like the guy's personality, he plays a crazy redneck, but seems like a real nice guy. The other youtube stars I really like are Joe Robinet the bushcrafter and Rich Rebuilds (although I can't remember his real name)

[freebeard]

Rich Benoit

[LioNiNoiL]

Originally Posted by kach22i

Frederick Lanchester — An untold history of Aeronautics & Aerodynamics
https://medium.com/@anthonyhughes_64...s-d77b582d16f4

I did a search on "Aerodonetics", found it means "the study of soaring or gliding", a word coined by Lanchester long ago; then found this very interesting web page:
Aerodynamics and Aerodonetics

[freebeard]

Thanks

One of their related stories: www.lanchesterinteractive.org: Lesson Plan – Lanchester Car Design Challenge. That is the announcement, it might be worth a deeper dive. Coventry University has done a lot of work on vehicular aerodynamics.