Fwd: Hermes: Ladies, Fly Me...

-----Original Message-----
From: b <rrdd3939@aol.com>
To: rrdd3939 <rrdd3939@aol.com>
Sent: Mon, Oct 8, 2012 7:33 pm
Subject: Fwd: Hermes has More Messengers...

                                 HERMES: LADIES, FLY ME!!!

                 by Richard DePersio and Citizen Journalist

 

Hermes: "I just got back from visiting with Urania at

www.comsat-ak.blogspot.com While Bacchus graciously

supplied the wine (I often fly high with or without wine; but 

always with the nectar of the gods), I don't appreciate his

being around and competing for Urania's affections...Below

learn some of my secrets as regards flight."

 

So what keeps a plane up, you ask...When in cruise

(straight-and-level flight: not changing speed, direction or

altitude), the lift on the airplane is equal to its weight; the

 trust produced by the engine is equal to the drag, which is

caused by air friction and the work done to produce the lift.

If your engine creates more thrust or if you raise the

leading edge of the wings, the plane will move faster and

ascend; conversely, lowering power or lowing the angle

that the leading edge makes with the flight path will lower

your altitude. (Visit posts one stage down).

The myth of centrifugal force...Orbital motion is often

described as a balance between two forces, the force of

gravitation...let's say...pulling the moon toward the earth,

and the outward 'centrifugal force' that keeps the moon

from falling into the earth. This simplification is more

confusing than explanatory.

       If you whirl a stone around over your head at the end

of a string, you feel a tug in the string; the stone pulls with a

mutual force on the string (Newton's Third Law of Motion).

There is no outside force pulling the stone away from you.

If there were and the string were to break, the stone would

move racially away from you. Instead it moves in the

direction of its motion.

     As diagram illustrates, an object in orbit falls around the

more massive object (go one stage down). If the more

massive object were to disappear, the body would move at

a right angle with respect to where the body had once been

not 180 degrees.

     There is no centrifugal force (cf) in orbital motion. In the

 case of the moon, no force is pulling outward on the moon

 to balance the attraction between the moon and the earth;

if there were such a balance of forces, the moon would

either not move at all or would move in a straight line (as

predicted by Newton's First Law of Motion).

     Many writers claim the cf is a reaction force to gravity

(Newton's Third Law). This too is incorrect. The reaction to

the earth's gravitational force on the moon is the moon's

gravitational force on earth - opposite to the direction of 

fictitious cf.

Gravity-assist or fly-by or sling-shot maneuver...if a space

probe or spacecraft were to fly close to a planet, it can use

the gravitational pull of the planet to increase its speed or

change its direction or both. (The spacecraft also alters

the speed of the planet {Newton's Third Law} but this

change is imperceptibly small). The direction that the

spacecraft approaches the planet, and whether it passes

on front of or behind it, determines the amount the

spacecraft speeds up or slow down. It constitutes a tricky

maneuver in celestial mechanics. Using gravity this way,

saves both time and fuel (and $$$s) and allows the

spacecraft to carry a heavier payload.

(Take you multi-stage rocket {Hermes permitting} all

around this Vulcan-designed/built comsat).