BEST + CORRECT Aerodynamic Streamlining Template

[slipknotsv]

your template please ChazInMT

[Frank Lee]

Providing information to you is much the same as talking to a wall.

[slipknotsv]

[kach22i]

Frank, to be fair, even with the "Sticky" threads it can be quite the quagmire finding that exact template one favors.

I like using the frosty green one BimBow colored up personally.

The red scallop line is cool and striking, some may favor that one but I have no idea where the unaltered version is myself.

http://s184.photobucket.com/user/kac...?sort=3&page=1




I have a feeling that I will be looking for the most aerodynamic watermelon this summer.

Perhaps I will make a fiberglass cast of it and have some fun with motorized RC models. I have an old RC Humvee which could benefit from a new shell.

[ByDesign]

Fun to see the bantering here . . . some of you have a fun sense of humor. Thanks for making me smile.

On aerodynamic shapes, size and speed are really important factors. RC cars were mentioned -- but the speed and size make aerodynamics far less important. (Basically if you have no frontal area, the CD becomes moot.) Similar with Solar vehicles -- at least classically -- they travel at much slower speeds than you'd design for in an automobile. Their big thing is trying to make every last watt count -- and from what I've seen, the biggest advantages are in the mechanics and internal electronics, even the cells -- not the 1/2% difference in aerodynamics. (That's not to trivialize it, just to emphasize there are so many important factors.)

As we compare to production vehicles, there are production and economic and all sorts of other considerations that enter in. Even as trivial as customers that want to see out the back window so they lower the trunk even though it's not ideal aerodynamically. Or, a 7 passenger vehicle -- hard to drop the rear roof line when someone needs to sit back there -- and no sense in making a long tail if a customer can't park in the garage. For one-offs, like us, yea, but not for production.

Generally, you can take any smooth foil shape and use it -- stretch it proportionally -- to meet the need. Longer for higher speed. Any smooth, continuous, convex surface will be better than one with interruptions, discontinuity or concavity. So many times I've seen results of weird stuff just works in the isolated situation and logical stuff fail. If you want to be very exact, there is no substitute for wind tunnel testing.

Per ChazInMT, what are you doing? That will make a big difference with respect to shapes and templates.

[freebeard]

R/C? My vote is for a turtle ....made out of watermelons. Or Gamera.

RC cars were mentioned -- but the speed and size make aerodynamics far less important.

In the early-mid 90s I was privileged to work for a computer hard drive/scanner company. Friday afternoons we all went out in the back parking lot and the various departments competed. Tech support was small so we got the receptionist.

My co-worker did the drivetrain and chased cats around his neighborhood. I did the aerodynamics and paint. Juie, who had a hard drive named after her (there's your big hint) was really good at driving from a remote POV.

It was a plastic shell that had the front wheelwells masked for paint but not cut out. The entire back face was cut out. On the back straight, it made so much downforce that it left a trail of dust (the height of the car) it was sucking out of the pavement suspended in the air.

[aerohead]

This 1981 profile,by Buchheim et al.,according to Hucho is the most 'aggressive' profile which will still retain attached flow over the aft-body

The AST-II is the second-most aggressive profile and fits standard rooflines with rapid descending contours.
The AST-I fits more conservative contours.
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All these profiles are just conservative contours which would prevent rapid pressure recovery which could trigger flow separation; based upon empirical wind tunnel testing.
They are intended for home-made,owner-built, individual aft-body streamlining projects.
Anyone with a full-scale wind tunnel or class-leading CFD capabilities will be able to achieve the same results for $2000-$4000/hour,plus materials and labor.

[slipknotsv]

your statement I expected Mr.aerohead you are the best on the page ecomodder big thanks

[slipknotsv]

even if you know something please let me know Mr.aerohead Thanks

[slipknotsv]

aerohead.............which is......AST-1 really good and best

AST-1............?


AST-1............?


AST-1............?


AST-2.............It's the right template



help me Thanks Aaerohead