Making a more efficient, aerodynamic soapbox gravity race car

[orengomotors]

Originally Posted by freebeard

That would depend on the angle, more upright and bluff will have less lift.
I think you were on the right track back in Permalink #131

To address the high stagnation point (the point where air can't decide to go up or down) add a crushable chin spoiler.

i think that the actual shape is very similar than Permalink #131:



to reduce lift some kind of splitter can me made:

[aerohead]

Sorry! Got caught up with the lift aspect.
#1 has the highest drag
#2 and #3 have the same drag
---------------------------------------------------------------------------
#1 is the worst as far as lift
#5 produces the most downforce
Between #3 and #4 you'd hit neutral lift.

[orengomotors]

Originally Posted by aerohead

Sorry! Got caught up with the lift aspect.
#1 has the highest drag
#2 and #3 have the same drag
---------------------------------------------------------------------------
#1 is the worst as far as lift
#5 produces the most downforce
Between #3 and #4 you'd hit neutral lift.

woow so it's the worst shape possible?

[aerohead]

The low stagnation point,sweptback nose,called 'Stromform' by a bus company in Germany which used it,repeatedly shows the lowest drag and is the easiest to control front lift with.
It's a 'blunt instrument',but for subsonic flow,it has advantages over many other designs.

Hucho has illustrated it's benefits
Here,R.G.S.White shows it as the lowest drag nose in his MIRA research of 1968

Here's HONDA's solar racer using it.Cd 0.10

It dates to 1922,with Paul Jaray's Zeppelin-inspired 'pumpkin seed.'

It's been considered 'ideal' ever since.

[freebeard]

Except it will try to burrow under anything it runs into.

It's also important to be able to paint a shark-mouth on it.

[bikeprof]

Originally Posted by orengomotors

i have already started!

HAHAHAHA, looks like my room in college days 😳 !

[bikeprof]

1. Hard to "re-invent the wheel"
2. FISH, think like a FISH
3. Only the front can be blunt/sharp/flat BUT rest HAS to be smooth with the % of previously studied aerodynamics designs
4. Like the song; "Get Down"...
The lower, the better. So lay down/stretch the frame like Bonneville cars

Mucha suerte y gana para nosotros... ��

[bikeprof]

Originally Posted by freebeard

Quoth Google: "expressing shock and alarm, often for humorous effect."

Many TV shows on AMERICAN idiotboxes when Walt Disney was alive HAD that action term ��, YIKES...
Because shortly before or after, something was to happen! ��������������

[orengomotors]

Originally Posted by freebeard

Except it will try to burrow under anything it runs into.

It's also important to be able to paint a shark-mouth on it.

hmmm, shark-mouth

[orengomotors]

I'm Back!

I had some school work but now it's over.
Well, the foam mold project didn't work very well so i decided to do something different:









What do you think? it's better than when i posted the first picture on this forum?

I also Installed some 6 point harnesses for safety reasons.