Aerodynamics thread?

recumpence · Post by **recumpence** » Jul 11 2008 9:23pm

Wow, that is just weird!

Matt

TylerDurden · Post by **TylerDurden** » Jul 11 2008 9:32pm

Bob McCree has one... (no tailbox tho). I figger, why not?

docnjoj · Post by **docnjoj** » Jul 12 2008 9:32am

I've been eyeing Cruzbike conversion kit for years! Brilliant engineering! I may be too old to go back to 2 wheels, after 5 years on my trike! Aero idea looks real slick, and covers packages.
otherDoc

TylerDurden · Post by **TylerDurden** » Jul 12 2008 1:34pm

Testing flow illustrator:

michaelplogue · Post by **michaelplogue** » Jul 12 2008 5:18pm

Cool little tool you've found there! Thanks for the link. TD - it looks like one would be better off having the tail cowling come to a point rather than being rounded off.

Ben · Post by **Ben** » Jul 13 2008 1:48am

Doesn't really matter, you've got an extra dimension to play with in real life. Just make the fairing come to a knife's edge vertically and it'll be fine.

You could try chucking the top view in the illustrator and see how it looks.

truckerzero · Post by **truckerzero** » Jul 16 2008 1:07am

old saying :thers no substittute for cubic inches
new saying:thers no substittute for watts !!!
just kidding watts plus cda = top speed

MidniteTweeker · Post by **MidniteTweeker** » Jul 17 2008 1:40pm

Evolution of aerodynamics?

MT

jnuts · Post by **jnuts** » Jul 17 2008 8:15pm

TylerDurden wrote:Testing flow illustrator:

How did you get it to work? I keep getting 0 kb movies sent to me when I try to create one with a standard airfoil that is included in the web page.

TylerDurden · Post by **TylerDurden** » Jul 18 2008 12:12am

jnuts wrote:How did you get it to work? I keep getting 0 kb movies sent to me when I try to create one with a standard airfoil that is included in the web page.

I never used the test stuff, just uploaded a bitmap.

Check the controls for how many seconds you want the movie... IIRC, I made mine ~15sec.

It does spit back an AVI, so filesize will be big.

Ben · Post by **Ben** » Jul 18 2008 1:55am

jnuts wrote:How did you get it to work? I keep getting 0 kb movies sent to me when I try to create one with a standard airfoil that is included in the web page.

Yeah I get the same thing with anything I try (settings or object type).

paultrafalgar · Post by **paultrafalgar** » Jul 18 2008 2:44am

MidniteTweeker wrote:Evolution of aerodynamics?

MT

Nice try MidniteTweeker, but you left out a stage:

: ascentofman3.jpg (27.13 KiB) Viewed 1662 times

TylerDurden · Post by **TylerDurden** » Jul 18 2008 10:02am

worked 4 me

jnuts · Post by **jnuts** » Jul 18 2008 10:55am

TylerDurden wrote:worked 4 me

Ack! I've tried it with IE and Firefox - both return 0 kb sized movies.

TylerDurden · Post by **TylerDurden** » Jul 18 2008 11:32am

PM sent, but others may have the same issue, so I'm posting here...

Hi folks,

Couple of thoughts:

Your ISP or firewall may be blocking the files

The codec is IV50 wich got broken in some versions of WinXP and Vista, you may have to download again and reinstall IV50.

HTH

jnuts · Post by **jnuts** » Jul 18 2008 11:48am

TD - thanks for the PM. I'm lost as to why it's returning a null sized movie. I sent an email off to the author.

michaelplogue · Post by **michaelplogue** » Jul 18 2008 2:27pm

I'm having the same problem. Just installed the codec mentioned above and am giving it another try.

jnuts · Post by **jnuts** » Jul 18 2008 2:58pm

It doesn't matter if you have the mother of all codec packs installed - if the file size is null, zip, zero, zilch, nada.... there is nothing to play.

TylerDurden · Post by **TylerDurden** » Jul 18 2008 4:51pm

Here is a link to the movie I downloaded from the flow sim:

http://paperstreetltd.com.p2.hostingpro ... rMovie.avi

Please download and verify it plays on your pooters.

Edit:

new link http://www.paperstreetltd.com/media/video/YourMovie.avi

Ben · Post by **Ben** » Jul 18 2008 6:49pm

Gah! I can download your movie and play it, but I still get that darn 0kb file thing happening when I try to make my own or download one of their movies.

jnuts · Post by **jnuts** » Jul 18 2008 6:55pm

TylerDurden wrote:Here is a link to the movie I downloaded from the flow sim:

http://paperstreetltd.com.p2.hostingpro ... rMovie.avi

Please download and verify it plays on your pooters.

Yep, plays fine here on media player classic.

paultrafalgar · Post by **paultrafalgar** » Jul 19 2008 3:26am

Works fine on gxine on Debian Linux.

John in CR · Post by **John in CR** » Jul 29 2008 12:58pm

OK, I've had it with the wind slowing me down. My good road routes put me directly into a headwind to start every ride. While it's great for the return trip, it's time to get sleeker. In addition to a small front fairing and a tailbox, I want to do some little things that will hopefully add up.

Tires- These knobby off-road tires have got to go. I don't like them in the curves anyway, and they must be a real aero thief too. Whenever I lift the tire off the ground for a spin test it's like I'm turning on a powerful fan.

Front suspension- I forget the exact relationship, but something I learned in my sailboat design research is that a cylindrical form has the same aero drag as proper foil that is 3-4 times thicker. I want to build some AL or fiberglass sleeves to turn those front shock housings into air foils, along with something similar for any exposed tubular shapes.

John

docnjoj · Post by **docnjoj** » Jul 29 2008 5:18pm

Thats a good idea, JohninCR! My tubing is square, and I have been thinking about airfoiling it with foam and fiberglas/epoxy. Nice little upside down wing like them Formula 1 cars! Im not sure I go fast enuff to get any real benefit, as most of my rides are under 25 mph!
otherDoc

recumpence · Post by **recumpence** » Jul 29 2008 5:28pm

I am looking at making a tail box this winter. What I would love to do is make a complete seat and tailbox. The seat would be made of thin layers of plywood curved and laminated together, then the entire seat would be covered in carbon fiber or fiberglass.

The tail section would be made of a piano wire structure MIG welded together, then cloth stretched over and epoxied.

So many ideas, so little time!

Matt

Endless Sphere

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