Hobo Jungle

[Rufus T. Firefly]

TThe small "a" in L=ma stands for acceleration, which is a function of air speed in a wind tunnel or aircraft speed in the real world.

Hmmm...... Here I thought that acceleration was the rate of change of velocity.....

[rogruth]

Rufus,
Best watch out for that bottom one. It's planning something.

[Rufus T. Firefly]

Rufus,
Best watch out for that bottom one. It's planning something.

One of Sarge's in his library........... It's a creepy conspiracy from a cabal of conniving cats considering cruel and complete conquest...........

[rogruth]

If animals can connive cats probably will.
No way I am going to best your alliteration.

[MurphOnMillerAve]

...
No way I am going to best your alliteration.

Me either!

[rogruth]

Those cats are something that bears watching. They added to that alliteration when Rufus wasn't watching.

[webenda]

TThe small "a" in L=ma stands for acceleration, which is a function of air speed in a wind tunnel or aircraft speed in the real world.

Hmmm...... Here I thought that acceleration was the rate of change of velocity.....

Kinematic physics has not changed just because the old theories of flight were wrong. Acceleration equals change in velocity with respect to change in time or acceleration = F(v) = dv/dt or F(t) = dv/dt or F(v, t) = dv/dt, depending which factor(s) you are interested in.

The velocity Sarge keeps bringing up is the Velocity of the wing. I understand that lift is a function of aircraft speed and a few other things, I won't leave it out.

[webenda]

Those cats are something that bears watching. They added to that alliteration when Rufus wasn't watching.

Yes, bears need to watch out for cats. https://youtu.be/QLX6h4Z2q18

[rex desilets]

TThe small "a" in L=ma stands for acceleration, which is a function of air speed in a wind tunnel or aircraft speed in the real world.

Hmmm...... Here I thought that acceleration was the rate of change of velocity.....

Kinematic physics has not changed just because the old theories of flight were wrong. Acceleration equals change in velocity with respect to change in time or acceleration = F(v) = dv/dt or F(t) = dv/dt or F(v, t) = dv/dt, depending which factor(s) you are interested in.

The velocity Sarge keeps bringing up is the Velocity of the wing. I understand that lift is a function of aircraft speed and a few other things, I won't leave it out.

This ain't Einsteinian physics.

Force in a fluid medium is expressed as the product of a term (lift coefficient, drag coefficient, e.g.) times a reference area (coefficient and the reference area are interrelated) times a term called dynamic pressure. qinf, as it's called, is density of the medium times the square of the velocity through the medium divided by 2. As I recall qinf was derived to relate wind tunnel results to flight. Anyway, force is clearly a function of velocity in this case.

webenda wins again.

PS: sorry for the long form. Haven't gone to the trouble of figuring out to write equations in MTJ

[Rufus T. Firefly]

This ain't Einsteinian physics.

Could be, could be. Nod. Nod.

Say no more!

Wait! How about you express it as a Feynman diagram?

[rogruth]

I think it was in the 1940s that some real smart guys proved that aerodynamically the bee can't fly.
However the bee said "Nuts" and went on flying anyway.

I feel sure that Wayne, Sarge and a few others are really enjoying the above discussion.
I don't understand much of it but that is OK. This is the jungle and it is being used as
intended, I think. I will still probably learn something from it.

[webenda]

PS: sorry for the long form. Haven't gone to the trouble of figuring out to write equations in MTJ

Me either Rex. Sometimes I will simplify by writing the Newtonian portion of lift like this: L = ma, but that is not quite correct, as lift is a vector force and the equation should be written in vector format.



Equation of Lift


Coefficient of Lift


Coefficient of Drag

[robert.]

early theories of human flight.

[rex desilets]

Wait! How about you express it as a Feynman diagram?

See? there you go again, trying to make the whole thing non-Newtonian

[rex desilets]

webenda-
You are correct about the vector representation; however as a practical matter we define Drag as force parallel to the fluid flow and Lift as force perpendicular. Does away with all that messy sophistication.