Do winglets produce thrust?

Anyone?
Bob

"Bob Salvo" wrote in message
...
Anyone?
Bob
That's against the laws of thermodynamics. If you can make a passive device
produce thrust you should rule the world with your new perpetual motion
machine! At best it reduces losses.

Keith

Keith W wrote:

"Bob Salvo" wrote in message
...

Anyone?
Bob

That's against the laws of thermodynamics. If you can make a passive device
produce thrust you should rule the world with your new perpetual motion
machine! At best it reduces losses.

In my country, our gliders move forward because the wing produces
thrust, and our sailboats move over the water because the sail produces
thrust. Whether we should rule the world is causing much controversy.

--
-----
Replace "SPAM" with "charter" to email me directly

Eric Greenwell
Washington State
USA

Don't think so.
Gravity provides the thrust. Quite noticeably when fuselage
is pointed vertically. None at all when fuselage/wing is horizontal.




In article , Eric Greenwell
wrote:
Keith W wrote:

"Bob Salvo" wrote in message
...

Anyone?
Bob

That's against the laws of thermodynamics. If you can make a passive device
produce thrust you should rule the world with your new perpetual motion
machine! At best it reduces losses.

In my country, our gliders move forward because the wing produces
thrust, and our sailboats move over the water because the sail produces
thrust. Whether we should rule the world is causing much controversy.

On Fri, 28 Nov 2003 21:36:17 +0000, cddb wrote:

Don't think so.
Gravity provides the thrust. Quite noticeably when fuselage
is pointed vertically. None at all when fuselage/wing is horizontal.

Look at it from another point of view. If all forces are balanced and
winglets are added, drag is reduced. Then velocity increases until the
thrust/drag forces are equalized. The result of increased velocity is
additional lift. The horizontal component of the lift vector is thrust,
which increases as lift increases. Ergo, winglets produce thrust. ;)

LittleJohn
Madison, AL

LittleJohn wrote in message ogy.net...
On Fri, 28 Nov 2003 21:36:17 +0000, cddb wrote:

Don't think so.
Gravity provides the thrust. Quite noticeably when fuselage
is pointed vertically. None at all when fuselage/wing is horizontal.

Look at it from another point of view. If all forces are balanced and
winglets are added, drag is reduced. Then velocity increases until the
thrust/drag forces are equalized. The result of increased velocity is
additional lift. The horizontal component of the lift vector is thrust,
which increases as lift increases. Ergo, winglets produce thrust. ;)


Close. The horizontal component in the forward direction is thrust.
in a 90 degree bank the lift is also horizontal.

--

FF

(cddb) wrote in message hlink.net...
Don't think so.
Gravity provides the thrust. Quite noticeably when fuselage
is pointed vertically. None at all when fuselage/wing is horizontal.


Rather obviously if this were true the glider would only move in the
vertical direction, and not at all in the horizontal.

--

FF

"Eric Greenwell" wrote in message
...
Keith W wrote:

"Bob Salvo" wrote in message
...

Anyone?
Bob

That's against the laws of thermodynamics. If you can make a passive
device
produce thrust you should rule the world with your new perpetual motion
machine! At best it reduces losses.

In my country, our gliders move forward because the wing produces
thrust, and our sailboats move over the water because the sail produces
thrust. Whether we should rule the world is causing much controversy.

--
-----
Replace "SPAM" with "charter" to email me directly

Eric Greenwell
Washington State
USA

Yep - I was thinking of thrust as a primary force rather than that due to
'tobogganing' (ie a change of supporting force forward of the vertical).
Away I go to the sackcloth and ashes 8-).

As to whether the US should rule the world - I will duck out of that to
prevent a repetition of the reams of vehement verbiage which has already
filled the bit stream 8-))

Keith

I don't think it was that "US" rules the world.. but more the line that.. he
who masters the air above us.. (glider pilots) .. rule the world..

BT

"Keith W" wrote in message
...

"Eric Greenwell" wrote in message
...
Keith W wrote:

"Bob Salvo" wrote in message
...

Anyone?
Bob

That's against the laws of thermodynamics. If you can make a passive
device
produce thrust you should rule the world with your new perpetual
motion
machine! At best it reduces losses.

In my country, our gliders move forward because the wing produces
thrust, and our sailboats move over the water because the sail produces
thrust. Whether we should rule the world is causing much controversy.

--
-----
Replace "SPAM" with "charter" to email me directly

Eric Greenwell
Washington State
USA

Yep - I was thinking of thrust as a primary force rather than that due to
'tobogganing' (ie a change of supporting force forward of the vertical).
Away I go to the sackcloth and ashes 8-).

As to whether the US should rule the world - I will duck out of that to
prevent a repetition of the reams of vehement verbiage which has already
filled the bit stream 8-))

Keith

Winglets produce lift, with a vector. The vector direction
can be perpendicular to the winglet surface, fwd or aft.
That is dependant on how it is shaped and mounted.
A lift vector facing the nose (fwd) being called thrust
might be a mishmash of terms, but it happens.
I usually think of thrust as a motive force acting on the vehicle.
Winglet vectors are recovery of lost energy by reshaping flow
to our advantage. Good idea, yes, thrust...... probably not
a really good description of what is happening........

Scott.