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LSA FAA definition. Max gross takeoff weight = 1320 lbs Max stall speed = 45 knots Maximum speed in level flight = 120 knots. ASTM F 2245-07 guidelines. Limit load factors Ultimate load factor of safety = 1.5 Special ultimate S.F.s for hinges, bearings, pins, control components

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lsa faa definition
LSA FAA definition
  • Max gross takeoff weight = 1320 lbs
  • Max stall speed = 45 knots
  • Maximum speed in level flight = 120 knots
astm f 2245 07 guidelines
ASTM F 2245-07 guidelines
  • Limit load factors
  • Ultimate load factor of safety = 1.5
  • Special ultimate S.F.s for hinges, bearings, pins, control components
  • Flight conditions
  • Design speeds
design speeds
Design speeds
  • 45 knots = Stall speed (LSA)
  • 99.6 knots= Minimum maneuvering Speed
  • 108 knots = Minimum cruise
  • 120 knots = Maximum cruise (LSA)
  • 160 knots = Dive speed
flight envelope
Flight envelope

VA VC,max VD

Vs

total loads
Total Loads
  • Level flight 1320 lbs
  • Design Limit load = 5280 lbs
  • Ultimate load = 7920 lbs (for 3 seconds)
xflr5
XFLR5
  • Simulations
    • Various A.O.A. and Reynolds numbers
    • Wing panels
  • Data (spreadsheet)
    • Aerodynamic coefficients
    • Lift, drag, and moment forces
shear and bending
Shear and bending
  • Integrate ultimate load equations
    • From 0(root) to 8ft (airfoil switch)
      • F = -5.2139x + 318.37
    • From 8ft to tip (15ft)
      • F = -3.255x2 +54.497x + 42.791
torsion control loads
Torsion/control loads
  • 75% positive maneuvering load, plus torsion from max aileron displacement
  • Gust loads at VF with flaps extended (7.5 m/s)
gusts
Gusts
  • Symmetric vertical gusts (up and down)
    • 15 m/s at VC
    • 7.5 m/s at VD
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