Aero forces

Pooh might have a greater mass than Minnie. It will then have a greater inertia (which varies directly with mass and acceleration). This happens to be Newton's second law.
 
Minnie, being black in color, heats up more inside and so, like a hot air balloon, has more buoyancy than Pooh.




Told by the boat "skipper" on the Jungle Cruise: Why does no one like Piglet?


'Cause he likes to play with pooh.
 
Update:

Minnie weighs 0.037 oz

Pooh weighs 0.035 oz

Minnie was turned sideward and backward relative to the airstream...no change.

Minnie's ears were incrementally reduced in surface area...no change.

Minnie's ears were completely removed...no change.

Car traveled exactly at 45 mph indicated, in two directions 180 degrees opposite direction.
 
Richard said:
Update:

Minnie weighs 0.037 oz

Pooh weighs 0.035 oz

Minnie was turned sideward and backward relative to the airstream...no change.

Minnie's ears were incrementally reduced in surface area...no change.

Minnie's ears were completely removed...no change.

Car traveled exactly at 45 mph indicated, in two directions 180 degrees opposite direction.
Click to expand...
Are they made of the exact same material?
 
pooh was on the top of the antenna. therefore his head would hit the roof, but minnie who was below pooh couldn't touch the car.
 
What is the comparative surface texture. Does Minnie have rougher skin than Pooh? I can't tell from the picture. If she does, the boundary layer separates from the surface later making her more aerodynamic with less turbulent airflow acting on her backside.

There is a wind tunnel experiment testing drag of a smooth sphere vs. drag of an identical sphere with a circular spot of sand glued to the front of it that demonstrates a reduction in drag with the rough surface. Possibly the same effect a dimples on a golf ball.

Always made me wonder if gluing a strip of sandpaper to the leading edge of the wing would reduce drag on the wing.
 
Last edited:
Graueradler said:
Always made me wonder if gluing a strip of sandpaper to the leading edge of the wing would reduce drag on the wing.
Click to expand...

not necessarily on the leading edge, but at the point where the flow transitions from laminar to turbulent. this guy was at the SSA convention last year and had a fairly interesting presentation:
http://www.sinhatech.com/

regular turbulators have been used for years in high performance gliders to get a little bit more performance
 
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