Low drag shape design

[JulianEdgar]

Originally Posted by aerohead

Only wing-based vehicles would be associated with wetted area.

Sorry, are you serious? You're not aware of the significance of wetted area to ultra low drag cars?

It just amazes me how you so blithely dismiss what real experts say and write - just like that!

[aerohead]

Originally Posted by JulianEdgar

Sorry, are you serious? You're not aware of the significance of wetted area to ultra low drag cars?

It just amazes me how you so blithely dismiss what real experts say and write - just like that!

Guess you forgot your smart-pill. Again.
I'm fully aware of the significance of wetted area in connection to airfoils, and solar, or SAE Eco Marathon racers, based upon airfoils. However, since
wetted area is a consideration only for wing-derived vehicles, it's not germane to production passenger cars. Fully-attached flow is presumed for 'wing' cars, on account of the terrific fineness ratios these bodies possess.
Road vehicles on the other hand are typically 'bluff-bodies', of which drag is ruled by separation. It's the reason we streamline.
Airfoil-derived passenger cars would be a fail, on account of scaling issues. They're worthless except for on a closed course, or protected from real vehicles by escort vehicles, as with the World Solar Challenge, or North American Solar Challenge.
You don't see Hucho advocating for them, although he does advocate for the 'template.' Get your facts straight!

[JulianEdgar]

Originally Posted by aerohead

Guess you forgot your smart-pill. Again.
I'm fully aware of the significance of wetted area in connection to airfoils, and solar, or SAE Eco Marathon racers, based upon airfoils. However, since
wetted area is a consideration only for wing-derived vehicles, it's not germane to production passenger cars. Fully-attached flow is presumed for 'wing' cars, on account of the terrific fineness ratios these bodies possess.
Road vehicles on the other hand are typically 'bluff-bodies', of which drag is ruled by separation. It's the reason we streamline.
Airfoil-derived passenger cars would be a fail, on account of scaling issues. They're worthless except for on a closed course, or protected from real vehicles by escort vehicles, as with the World Solar Challenge, or North American Solar Challenge.
You don't see Hucho advocating for them, although he does advocate for the 'template.' Get your facts straight!

Did you even read the thread title? Let alone my first post in the thread? 'Vehicle' does not equal just 'passenger car'.

We've had this problem before: dogs have four legs. Not every four legged animal is a dog.

[aerohead]

Originally Posted by JulianEdgar

Did you even read the thread title? Let alone my first post in the thread? 'Vehicle' does not equal just 'passenger car'.

We've had this problem before: dogs have four legs. Not every four legged animal is a dog.

Look. I live in the real world. I'm not interested in much that has zero relevance with respect to passenger cars, operated on real roads, under real conditions.
What's your point?

[JulianEdgar]

Originally Posted by aerohead

Look. I live in the real world. I'm not interested in much that has zero relevance with respect to passenger cars, operated on real roads, under real conditions.
What's your point?

I wrote the post in the context of someone here who is interested in designing a low drag fairing for a bike, and others designing trailers. That's why I named the thread 'low drag shape design'.

I guess when your first reaction is to dismiss any reference you don't have (ie everything after 1986, basically) then I shouldn't be surprised when you do the same here again.

[aerohead]

Originally Posted by JulianEdgar

I wrote the post in the context of someone here who is interested in designing a low drag fairing for a bike, and others designing trailers. That's why I named the thread 'low drag shape design'.

I guess when your first reaction is to dismiss any reference you don't have (ie everything after 1986, basically) then I shouldn't be surprised when you do the same here again.

No context was provided in the preamble to your post.
You got into wetted area. That's fair game if we're talking bicycle shells. It would be nice if that had been conveyed. I don't have ESP.
Trailers is another issue. Hard to go for any sort of laminar boundary layer. The bike would kill any chance of that.