FLAPS and SLATS (swift air bridge class) #B737!
I'll start the furry ball rolling - to me, a Fixed Slat is a slat mounted on extensions from the leading edge whereas a Slotted Wing has slots 'built in' to difference between leading edge flaps slots and slats section.
Memory fails me but I believe Handley Page had a machine with a slot built into the section - anyone recall?
Over to the dogs.
Is there a difference between these two?
In my experience, both terms are used pretty well interchangeably.
As you will see there were lots of slots!!
As you can see here section 4the 'slot' can be at any point in the section, its function primarily is to re-energise the upper surface boundary layer with 'high pressure' difference between leading edge flaps slots and slats to improve attachment, in this case just in front of the flaps.
Southampton University cover it well at page 93 of doc Memory fails me but I believe Handley Page had a machine with a slot built into the section - anyone recall?
Handley Page invented the slotted slat at the wing leading edge which postpones stalling to a higher angle of attack.
I am still searching for an aircraft I recall from the dim and distant past which had a spanwise slot about 1 foot back from the L Edge - I thought it was HP but so far no sign of it.
It was either a single or difference between leading edge flaps slots and slats engined machine The remarkable Me163 rocket plane had fixed slotted outer wing sections.
Some versions of F4 had a fixed slat on their anhedral tailplanes.
I think the only likely 'candidate' so far there is the 163.
I cannot find a planform of the Turbulent but I'm pretty sure like the 2 from FD those are 'fixed slats', not slots.
From an aerodynamic standpoint, they both do the same thing.
From a conceptual standpoint, I'd say a fixed slat is something separate bolted onto a given airfoil, whereas a slotted wing is an air channel cut within that airfoil.
Take it off, and you are back to your original airfoil.
Conversely, take a given airfoil and cut a slot through it, and the overall external profile of the airfoil is still the same.
Remove the slot and the portion of airfoil ahead of it and you no longer have the original airfoil.
BOAC: the best I could find is this link: Slot quite clear on the wing outer section.
Did not also the G91 not have a wing slot?
From the "lite" peanut gallery.
Slats seemed to be like those on the F-100.
They didn't pop out until the AoA was above "x".
Or were manually controlled.
Some really old planes had those like the Stinson and others.
Possibly some of the ME-109 variants.
Then we had basic leading edge flaps like the A-7 and F-16 had.
The A-7 ones came down with teh flaps.
The Viper ones worked full time acoording to AoA and mach, but were fixed down at "x" degrees when gear handle was lowered.
The DC-8 has slots inboard of each engine pylon that open and close with flap movement closed when flaps up and open when flaps extended.
Slats, to me, are something different.
The DC-8 has slots inboard of each engine pylon that open and close with flap movement closed when flaps up and open when flaps extended Thank you all for your answers.
Definitely they are similar in operation, but I couldn't find a clear photo of a slotted wing.
Like many terms use in aviation "slots" and "slats" can mean more than one thing according to applicability and historical pedigree!
I'll stick to the common understanding of the terms as I've come to know them.
While I have simplified my explanations somewhat, it's my hope that I've not strayed so far away from the objectively academic so as to promote any misunderstanding.
Most commonly, a slot is a gap through which higher pressure air can flow from the lower airfoil surface to the upper surface.
bonus machines slot spins and poker with free the air passes through the slot it increases in velocity and is added to the airflow over the upper airfoil surface.
This adds energy to the boundary layer airflow over the upper surface, thus increasing the critical angle of attack in the area behind the slot.
By delaying the onset of airflow separation to a higher AOA, slots increase the maximum coefficient of lift attainable across a particular airfoil section.
Slots may be found placed slightly aft of a wing leading edge fixed slotbetween a leading edge slat and the wing leading edge or between trailing edge flap segments on a multi-segment trailing edge flap system such as Fowler flaps.
The fixed slot is typically placed along the outboard section of a wing leading edge.
Placed as such, the critical AOA is higher in the outboard portion of the wing than the inboard portion, thus promoting inboard to outboard stall progression and maintaining aileron effectiveness to a higher AOA.
This is especially useful in reducing the roll moment produced by asymmetrical stalls.
Wing washout and https://riobec.info/and-slots/rome-and-egypt-slot-online-free.html stall strips are two other methods available to accomplish similar results on a constant chord wing, though perhaps somewhat less effectively.
A slat extends forward and downward into the airstream.
If fixed, it is sometimes referred to as a leading edge "cuff".
If moveable, slats may be actuated by a powered aircraft system such as hydraulic or electrical.
Slat rails are placed at intervals along the wing span and oriented longitudinally difference between leading edge flaps slots and slats guide the slat along it's travel path.
A slat is to a droop leading edge as a Fowler flap is to a plain flap.
DLEs and plain flaps simply hinge down, increasing wing camber, while Fowler flaps and slats extend downward AND transit along the chord line.
Both the Fowler flap and the slat increase the wing surface area in addition to increasing the airfoil camber as they extend.
Alternatively, slats may be actuated aerodynamically when high AOA causes an air pressure difference which acts to pull the slot machine store chandler az slat out on it's rails to the extended position.
Dynamic pressure pushes them back to the stowed position when the AOA is reduced enough.
I hope that's helpful, westhawk The DC-8 has slots inboard of each engine pylon that open and close with flap difference between leading edge flaps slots and slats closed when flaps up and open when flaps extended.
The slots on the DC8 were an early modification for the DC8-12 model.
Initial operations must have shown there was some issue which they overcame.
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