Overlaying a Car On the Template

[Sven7]

Cleanspeed- glad to help.

Frank and Carlos-
It's probably better to line it up to the rear of the roof in the case of the wagon just to get smooth flow. But in general...

[Frank Lee]

In #10 the wagon roof poking through means the template needs to go rearward until it doesn't. The Seville looks good now- that's what I'd use on that one.

[cfg83]

Frank -

Originally Posted by Frank Lee

In #10 the wagon roof poking through means the template needs to go rearward until it doesn't. The Seville looks good now- that's what I'd use on that one.

I used to slide the template back until aerohead corrected me :

Originally Posted by aerohead

Baja,sorry!,just now catching your post.
Robert is correct with respect to the template.Find the highest point of your roof and align with the point of max camber on the template.

In the above, the center of max roof camber is more important than aligning the end of the car to the template.

I asked the same question here :

http://ecomodder.com/forum/showthrea...ber-12801.html

CarloSW2

[sgtlethargic]

http://ecomodder.com/forum/showthrea...-c-9287-8.html

http://ecomodder.com/forum/showthrea...-c-9287-9.html

I know, my RanchAero overlay isn't on there right. I believe I used Picasa and when I clicked on the overlay it went see-through, so I took a screenshot [Ctrl + Prt Scr].

And I was thinking an "Overlay the aerodynamic streamlining template" thread would be good.

[Frank Lee]

Originally Posted by cfg83

Frank -



I used to slide the template back until aerohead corrected me :



In the above, the center of max roof camber is more important than aligning the end of the car to the template.

I asked the same question here :

http://ecomodder.com/forum/showthrea...ber-12801.html

CarloSW2

Not buying it. I think having the roof poke through the template aft of max camber renders flow downstream of the poke-through compromised and thus the whole project moot. Were those guys thinking of cutting the roof down, not simply adding the Kamm aft of what's there? Were I to do a template overlay on Moon Unit I'd first scale the heights then slide the template aft until there's nothing pokey outey.

[t vago]

I used a combination of Microsoft Word, the online application pixlr, very basic html coding, and Microsoft Paint for my overlays. Basically, I rotated the vehicle image until it was horizontal (the image was originally rotated about 0.8 degrees). I then performed a transparency operation on my vehicle image using pixlr to make the background transparent. I then used html code to match the sizes of the vehicle and the aero template, as well as matching the 0 degree point of the aero template to the vehicle top as described. After I was satisfied with the result, I pressed <alt>-<prtscrn> to grab the picture as a screen capture, then pasted it into Microsoft paint to save the capture as a PNG image.

This is the result:

[cfg83]

Frank -

Originally Posted by Frank Lee

Not buying it. I think having the roof poke through the template aft of max camber renders flow downstream of the poke-through compromised and thus the whole project moot. Were those guys thinking of cutting the roof down, not simply adding the Kamm aft of what's there? Were I to do a template overlay on Moon Unit I'd first scale the heights then slide the template aft until there's nothing pokey outey.

I hope you're right because that means my wagon is good "as is".

CarloSW2

[Frank Lee]

Your wagon is good as is, but would be better with a kamm tail extension!

[jtbo]

Template is optimal shape, but it is for best length of 'wing', there are longer wings with different aspect ratio, different kind of aerofoils, maybe longer vehicle would require template to be adapted for such?

My roof is one big level plane, so highest point is almost everywhere, but then again having really good pic from side is something difficult, if car is not photographed directly from the side and from appropriate height there will be big errors, also blueprints are something one really can't trust, those can be way off, but can of course give some idea from shape. There is many things to consider.

Chopping rear end of wagon would make quite nice mini kamm though :P

[Sven7]

"Blueprints can be way off"? It's pretty easy to judge the good ones vs. bad ones.

But I agree with what you're saying about the template. Since the wagon's roof is so flat you can probably stretch the rules a little to put the 0% mark near to the rear of the roof. It will give a better overall flow than pretending you can cut off a chunk of the rear to fit the template.