Lesson 5. Stalling

Date: 24/9/2016
Flight purpose: Stalling
Flight time (hrs): 1.0
Aircraft: VH-TOI, Tobago

14369888_10154659048505815_3012668412787912222_n

Airport: Hervey Bay Aerodrome
Instructor: BS , Briefing time (hr): 1
Time to take off: 12:15 Runway: 29 YHBA
Time to land: 13:15 Runway: 29 YHBA
Total Engine time: ___ Approx. Fuel ____
Wx: Wx at aerodrome: Cloud None, Temp: 21.8, Wind Direction 200, Wind Strength 5 , Dewpoint: 9, Rainfall 0, Wind types steady, Visibility >10km, Humidity 59%, QNH 1012, Changes in Wx Conditions, BOM daily Wx obs: Temps Min (°C) 9.3, Max (°C) 26.9, Rain (mm) 0, Evap -, Sun -, [[Max daily wind gust: Dir __, Spd (km/h) __, Time (local) __]] [[9:00am record: Temp (°C) 21.8, RH (%) 41, Cloud – , Dir SSW, Spd (km/h) 7, MSLP (hPA) 1013.4]], [[3:00pm record: Temp (°C) 24.5, RH (%) 50, Cloud – , Dir N, Spd (km/h) 19, MSLP (hPa) 1008.4]] http://www.bom.gov.au/climate/dwo/IDCJDW4056.latest.shtmlTAF YHBA 232107Z 2400/241231008KT CAVOK

FM240400 01012KT 9999 FEW040

FM241100 34006KT 9999 SCT015 SCT025

RMK

T 23 25 24 20 Q 1013 1010 1009 1009

METAR YHBA 240400Z AUTO 36011KT 9999 // NCD 24/12 Q1009

RMK RF00.0/000.0
Goals: Set up a stall and recover from a pre-stall, stall and wing-stall safely

Briefing discussion: A stall is essentially when the wing fails to generate lift because it exceeds the critical angle of attack… this is a theoretical concept of AoA… there is a critical angle at which lift is not longer generated… before reaching the critical angle lift is increased, after the critical angle lift decreases. At the ritical angle the transition point is reached on the wing and drag becomes significant (feeling a buffet)… Discussed symptoms of a stall (sloppy controls, shaking, high angle of attack, low airspeed, stall warning device)… set stalling speed is influenced by several factors… stalling speed is INCREASED if there is icing, increased drag from configuration, increased load factor (i.e. G-Force), and increases in weight… stalling speed is DECREAED if flap is engaged and with any increase in power. Load factor at 60 degrees of bank in a light aircraft is ~2 g… Vs(new) = Vs(old)xsqrt.(load.factor)… .’, if turning at 60 degrees and Vs(old) = 60 kts then Vs(new) = 72 kts. Prior to stall do a safety check (HASSELL) – Height (>3000), Airframe (flaps, landing gear), Safety & Security  (loose objects, harnesses, hatches) , Engine (oil pressure and temperature), Location (orientated to area, check for any built up areas) and Lookout do 2x 180 deg turns left and right to clear the area… this can be abbreviated to HELL after 1-2 checks (as the ASS components don’t change)… Routine; Carb-heat on, power off, hold attitude and altitude, experience stall speed and recover (in the Tobago also note the CSU needs to be controlled to account for pitch). Recovery; Reduce AoA (only slightly) – lower nose, power up to full throttle, use rudder to counter the wing drop (opposite to the wing), turn carb-heat off… note one wing can stall, don’t use aileron to correct, use the yaw pedals.
Tasks: pre-flight checks, oil administration, start-up procedures and checks, radios, take-off, climbing, descent, turns, managing the CSU, stalling.
Notes:  Stalls were demonstrated, and practiced. Symptoms of a stall were experienced – it was particularly interesting to note how long it takes to get the aircraft to stall, and how bad the plane feels when one is about to stall. Initial attempts to stall were very poor, loosing 600-700 ft in one go. This was practiced to improve to within 100 ft. Be careful not to pull too far back on the elevator to gain altitude before entering the stall when demonstrating ability… the purpose is to remain disciplined, if being asked to stall at 3,800 ft, stall at 3,800 ft. Coordinating power and elevator control at the same time is important. Don’t let the nose drop down below the horizon too far otherwise one risks loosing a lot of altitude in a dive and risks a G-loaded stall on pulling out too quick. With extra time  60 degree turns were demonstrated. Radios to communicate with another pilot on approach to airfield, very difficult seeing low planes around the bay (even against water)…
Radios: YHBA AWIS 134.9, general

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