Aerodynamics of a bug

[aircured]

Originally Posted by evilC

Hi Gerrelt,

It sounds as though its well proven then.
Please let me know when they become available either here or on my e-mail address - clive.williams@bwdltd.com

Many thanks

Clive

And me
Here is ok or pm me
Am also interested in combined international shipping?

[70Turbobug]

Interesting Thread! The vw bug has a Cd value of 0,48.A teardrop has 0,05 and an average aircraft wing profile has 0,08.The funny thing is a T2 vw bus has a cd value of 0,44 eventhough it has a larger surface area up front,it is much longer than the bug,which gives it an overall better value.
The bug´s aerodynamics are greatly improved by lowering the vehicle and adding spoilers as everyone knows.However,I haven´t seen any values to compare.
Some of the Käfer Cup bugs and a few of the hillclimb bugs have slots or holes in their fenders and some run shorter rear fenders allowing more air to pass out the back.If your racing,looks aren´t as important as function so I doubt that anyone is really going to adapt that to their street car.

[Bruce.]

I didn't realise a bus has a better cd

However cd is ratio thing so a brick has a cd of 1 regardless if it is the size of a Lego block or the size of a house. You multiply the cd and the frontal area to get the drag figure.

[aircured]

Why don't you get one of these and make a mould of just the part you want.
It tucks under the window rubber.

[Xellex]

I have one of those. I don't think it would help aerodynamically. Do you have a picture of the part that it mounts onto? (the part that actually tucks under the rubber). I'm missing that and it would be nice to see what it looked like

[aircured]

Originally Posted by Xellex

I have one of those. I don't think it would help aerodynamically. Do you have a picture of the part that it mounts onto? (the part that actually tucks under the rubber). I'm missing that and it would be nice to see what it looked like

Sorry haven't got the spoiler anymore, otherwise I would have taken some more photos for you.
I remember it being small pieces of z shaped metal with a hole drilled in it, then a plastic screw, screwed through the spoiler into the metal hanger, which was wedged under the rear window rubber seal... clear as mud I know

[Xellex]

Originally Posted by aircured

I remember it being small pieces of z shaped metal with a hole drilled in it, then a plastic screw, screwed through the spoiler into the metal hanger, which was wedged under the rear window rubber seal... clear as mud I know

Thanks, I think I got the picture All I seem to be missing is the z-shaped metal pieces. I think I actually have the plastic screws too.

[70Turbobug]

A 1302 and 1303 seem to have a different characteristic than an older (pre -67)1200 bug.I rode with Armin Klein in his bug on the Autobahn here in Germany.We were doing 257Km/h (160mph) passing a Porsche Boxster S at full speed.He uses an inductive type digital speedometer.Even it may be 10Km/h off that´s still pretty quick.I didn´t notice any lifting or instability whatsoever.He has no spoilers whatsoever.He has a Remmele Uni-ball set up in the rear,the front is a standard lowered front beam.It´s a daily driver that he races regularly.Here are some vids of the car while racing.

http://www.myvideo.de/watch/6952465/...zburgring_2009 - open track day training in Salzburg

http://www.myvideo.de/watch/6952429/...g_Classic_2009 - race in Salzburg

http://www.myvideo.de/watch/5607224/...e_Leipzig_2008 - Porsche track day in Leipzig

www.turboboxer.de

[Steve C]

Originally Posted by 70Turbobug

A 1302 and 1303 seem to have a different characteristic than an older (pre -67)1200 bug.

Hi

I owned flat screen bugs for years, Ovals, 40 hp bugs, late standard bugs & 1302s. Until a few years ago I had never owned a 1303 long term.

Seat of pants stuff, but the 1303 with its round front screen does feel much more slippery than a flat screen bug.

Steve

[70Turbobug]

Originally Posted by Steve C

Hi

I owned flat screen bugs for years, Ovals, 40 hp bugs, late standard bugs & 1302s. Until a few years ago I had never owned a 1303 long term.

Seat of pants stuff, but the 1303 with its round front screen does feel much more slippery than a flat screen bug.

Steve

I haven´t been over 100mph in a 1303 yet,I never owned one either,so I lack the comparison. The 1303 does seem much quieter (wind noise) than the standard bugs,so there must be an aerodynamic improvement.Maybe the front of the 1303 has some disadvantage compared to the 1200 due to the round front valance? Technically the 1303 is far better than the standard bug,no question about that.

[Steve C]

Originally Posted by 70Turbobug

Technically the 1303 is far better than the standard bug,no question about that.

Lucky you said that here and not The Samba

[70Turbobug]

LOL!!! They will also tell you that the Cal-look rake is the best for aerodynamics!

[vdubzack]

Love it. Now to clean my screeen,as I did a spit take.

[chug_A_bug]

found this... if you save it and voom in you can See the #'s



Chris.

[Gerrelt]

That's one of the pages that came with a Kamei spoiler.

I've got that page and the rest of the pages here: Kamei spoiler documents

Sadly, the quality is not much better.

If somebody got these pages in better quality, please e-mail them to me!