leading edge flaps

From: Ed Rasimus

snip

Not sure what "roll steering" is.

snip

Ed Rasimus
Fighter Pilot (USAF-Ret)
"When Thunder Rolled"
Smithsonian Institution Press
ISBN #1-58834-103-8


The only place I have ever seen the terms "roll steering" and "pitch steering"
was in reference to the bars on an ADI.

Dan, U.S. Air Force, retired

From: "John R Weiss"
Date: 1/10/2004 2:05 PM Central Standard Time
Message-id: 9WYLb.15782$na.12393@attbi_s04

"Ed Rasimus" wrote...

Slats are typically UN-powered devices on the leading edge that extend
simply by the reduced dynamic pressure against them as airspeed slows.
Example would be the leading edge extensions of the F-86 and F-100.

There are powered examples as well, such as the A-6 and EA-6B.


Some leading and trailing edge flaps are "slotted" meaning they create
a gap in the airfoil when extended.

There are all sorts of variations including Krueger flaps, Fowler
flaps, "BLC" (boundary layer control) blown flaps, flaperons that
combine both flap and aileron functions, and spoilers which disrupt
airflow across the top of the wing to reduce lift/increase drag.

Just so there is no confusion, flaperons and spoilers are not [normally] used
as
leading edge devices.

It may be a matter of semantics on different airplanes types, but "flaperons"
as
used by Grumman on the A-6 and EA-6B serve as spoilers and ailerons, but NOT
as
flaps. There ARE several aircraft such as the F-4 that used drooped ailerons
as
flaps, but I have not heard or seen them called "flaperons."

Splaperons?

OK, maybe I could have resisted

Dan, U. S. Air Force, retired

"B2431" wrote...

The only place I have ever seen the terms "roll steering" and "pitch steering"
was in reference to the bars on an ADI.

To those you can add "roll-summed steering," which is how Grumman described the
steering commands on the ADI in the A-6.

"B2431" wrote...

Splaperons?

Only in Tehachipi...


OK, maybe I could have resisted

But why?

Ed Rasimus wrote:
On Sat, 10 Jan 2004 17:46:52 +0000, John Mullen
wrote:


Not to mention 'splaps', but that's getting a bit technical...

John


I wondered how long it would take. Mere minutes...

Heh heh!

Of all the lift devices the Krueger flap is in my opinion the oddest
one. Its hinged at the front and pivots forward into 'lift' position.
Stick out your hand, palm down, fingers folded back flat. Now
straighten your hand so that your fingers are bent down about 30
degrees from the plane of your palm. You have imitated a Kruger flap.
FWIW the L1011 had a neat mode of spoiler operation - with the
trailing edge flaps in land (33 degrees) position the wing spoilers
were positioned up 8 degrees. Slight movement of the yoke fore or aft
from the trimmed position raised or lowered the spoilers effecting a
useful change in lift with minimal change in AOA. Made it very easy to
stay on a glideslope or maintain a set rate of descent.
Walt BJ

"WaltBJ" wrote in message
om...
Of all the lift devices the Krueger flap is in my opinion the oddest
one. Its hinged at the front and pivots forward into 'lift' position.
Stick out your hand, palm down, fingers folded back flat. Now
straighten your hand so that your fingers are bent down about 30
degrees from the plane of your palm. You have imitated a Kruger flap.
FWIW the L1011 had a neat mode of spoiler operation - with the
trailing edge flaps in land (33 degrees) position the wing spoilers
were positioned up 8 degrees. Slight movement of the yoke fore or aft
from the trimmed position raised or lowered the spoilers effecting a
useful change in lift with minimal change in AOA. Made it very easy to
stay on a glideslope or maintain a set rate of descent.

The L-1011 lives on as a launch platform and offers performance superior in
both rate of climb and payload, over the B-52.

"John Mullen" wrote in message
...
Ed Rasimus wrote:
On Sat, 10 Jan 2004 17:46:52 +0000, John Mullen
wrote:


Not to mention 'splaps', but that's getting a bit technical...

John


I wondered how long it would take. Mere minutes...

Heh heh!

And yet, all Mullen did was demonstrate his own ignorance.

You have to love the irony.

"John R Weiss" wrote in message
news:mO0Mb.19013$I06.137495@attbi_s01...
"Tarver Engineering" wrote...

I have never read about "a spoiler flap in a speedbrake
configuration"
in any textbook. Anyone else?

You might want to look at the recorded parameters for the DFDR on your
747-400.

Sorry, but they don't let me bring home a DFDR. Exactly where would I
find a
reference to "a spoiler flap in a speedbrake configuration," and in what
context?

Look it up in CFR14, it is a required data element for digital flight data
recorders.

"John R Weiss" wrote in message
news:d51Mb.18790$8H.49642@attbi_s03...
"John R Weiss" wrote...
I have never read about "a spoiler flap in a speedbrake configuration"
in any textbook. Anyone else?

You might want to look at the recorded parameters for the DFDR on your
747-400.

Sorry, but they don't let me bring home a DFDR. Exactly where would I
find a
reference to "a spoiler flap in a speedbrake configuration," and in what
context?


Also, I just looked through 14CFR Part 121 -- including 121.343, 121.344,
and
Appendices B and M (the FAA standards for Flight Recorder and DFDR
operational
parameters) -- and found absolutely no reference to "spoiler flaps" in
ANY
configuration.

Or even "spoiler". Although, anyone familiar with aerodynamic surfaces
could use the full nomenclature for the fixed spoiler, or the spoiler flap.