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Landing speeds slower than stall speeds in guide.

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In the Specs guide, some of the planes show an slower indicated landing speed than the stall speed.

In this case G14, but there are more.

 

Indicated stall speed in flight configuration: 164..181 km/h
Indicated stall speed in takeoff/landing configuration: 156..172 km/h
Dive speed limit: 850 km/h
Maximum load factor: 10.5 G
Stall angle of attack in flight configuration: 19.8 °
Stall angle of attack in landing configuration: 17 °


Maximum true air speed at sea level, engine mode - Emergency: 576 km/h
Maximum true air speed at 5500 m,, engine mode - Emergency: 668 km/h
Maximum true air speed at sea level, engine mode - Combat: 505 km/h
Maximum true air speed at 2000 m, engine mode - Combat: 545 km/h
Maximum true air speed at 7000 m, engine mode - Combat: 619 km/h


Service ceiling: 11500 m
Climb rate at sea level: 19.2 m/s
Climb rate at 3000 m: 17.5 m/s
Climb rate at 6000 m: 13.1 m/s


Maximum performance turn at sea level: 23.0 s, at 270 km/h IAS.
Maximum performance turn at 3000 m: 31.5 s, at 270 km/h IAS.


Flight endurance at 3000 m: 2.15 h, at 350 km/h IAS.


Takeoff speed: 155..180 km/h
Glideslope speed: 195..205 km/h
Landing speed: 150..155 km/h
Landing angle: 13.7 °

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Thats correct as you are not landed until after the wing has stalled and stopped flying. 

if you have a wing that with flaps down stall at 100mph then you cannot be "landed" at 105mph.
your wheel might be on the ground but the wing is still flying and you have not really landed.

155kph stall speed with flaps n gear down while empty and low fuel. 
so it would be right to consider 150kph the point where plane is no longer flying and wing has fully stalled,
all weight on wheels.

Ideally you should be landing with stall horn blaring and plane near buffeting with a little energy left as possible so it cant bounce.



 

Edited by =TBAS=Sschatten14

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This seems confusing to me also. To me, "landing speed" should be equivalent to Vref which is always above stall speed.

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Really don't understand the confusion. 

 

It has nothing to do with approach speed, speed at touchdown, whatever. It is simply the speed at which the wing will reach critical AoA in that specified configuration.

 

In clean configuration that will be higher than in landing configuration, because in landing configuration you should have flaps fully deployed and one of the primary reasons to deploy flaps is to decrease your stall speed. 

 

Re-read and better understood the initial post.

 

Answer: Ground effect. The Landing Configuration stall speed is probably given for dirty config at altitude. Once at an altitude within approx. 1x wingspan of your a/c you will experience Ground Effect, which boosts lift/reduces stall speed.

 

 

Edited by DD_Fenrir

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Perhaps it's just semantics in the specs. I understood "landing speed" to be the speed when you cross the runway threshold, not Vs0 or Vs1.

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There is no flight manual that shows a slower landing speed than the stall speed in any airplane , (I fly real planes including a warbird) its wrong the way is displayed for some planes.

 

Now even if that is right, then how about all the others planes are they 50% of them wrong ,50% right ?

 

P51

Indicated stall speed in flight configuration: 159..196 km/h (99..122 mph)
Indicated stall speed in takeoff/landing configuration: 147..181 km/h (91..112 mph)

Dive speed limit: 812 km/h (505 mph)
Maximum load factor: 10.0 G
Stall angle of attack in flight configuration: 19.1 °
Stall angle of attack in landing configuration: 16.3 °

Maximum true air speed at sea level, engine mode - WEP: 592 km/h (368 mph)
Maximum true air speed at 8000 m (26250 feet), engine mode - WEP: 717 km/h (446 mph)

Maximum true air speed at sea level, engine mode - WEP, with 150 grade fuel: 607 km/h (377 mph)
Maximum true air speed at 7000 m (22960 feet), engine mode - WEP, with 150 grade fuel: 718 km/h (446 mph)

Maximum true air speed at sea level, engine mode - Combat: 578 km/h (359 mph)
Maximum true air speed at 8500 m (28000 feet), engine mode - Combat: 711 km/h (442 mph)

Maximum true air speed at sea level, engine mode - Cruise: 513 km/h (319 mph)
Maximum true air speed at 8500 m (28000 feet), engine mode - Cruise: 646 km/h (401 mph)

Service ceiling: 12680 m (41600 feet)

Climb at engine mode - WEP
Climb rate at sea level: 18.1 m/s (3567 feet/min)
Climb rate at 3000 m (9843 feet): 15.7 m/s (3083 feet/min)
Climb rate at 6000 m (19685 feet): 12.4 m/s (2433 feet/min)

Maximum performance turn at sea level: 20.0 s, at 290 km/h (180 mph) IAS.
Maximum performance turn at 3000 m (9843 feet): 29.5 s, at 295 km/h (183 mph) IAS.

Flight endurance at 3000 m (9843 feet): 4.3 h, at 350 km/h (217 mph) IAS.

Takeoff speed: 185..200 km/h (115..125 mph)
Glideslope speed: 185..210 km/h (115..130 mph)
Landing speed: 175..195 km/h (110..120 mph)
Landing angle: 12.9 °
 

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SCG_motoadve, so from a pilot's point of view, "landing speed" should be Vref? I also can't understand any useful airspeed below stall speed.

 

I think the specs guide simply needs to be corrected.

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2 hours ago, Canvas25 said:

 I also can't understand any useful airspeed below stall speed.

 

 

retired-marine-pilot-purchases-his-very-

Edited by bzc3lk
  • Haha 1

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