HELICOPTER AERODYNAMICS CARs

ADVANCED HELICOPTER AERODYNAMICS SIMULATION
Full Mod Description for Arma Reforger (shortened to ~4800 chars)
OVERVIEW
Adds realistic aerodynamic simulation for all helicopters in Arma Reforger. Each helicopter gets a unique profile based on real specs. Flight physics use aviation formulas for effects like ground effect, ETL, VRS, etc.
SUPPORTED HELICOPTERS
UH-1H Huey — rotor radius 7.32 m, 2 blades, mass 3629 kg, power 1100 kW
Mi-8MT Hip — rotor radius 10.65 m, 5 blades, mass 11100 kg, power 3280 kW
Mi-24 Hind — rotor radius 8.65 m, 5 blades, mass 10500 kg, power 3240 kW
Unknown helicopters get auto-generated profiles from rotor radius and RPM.
KEY AERODYNAMIC EFFECTS
Ground Effect
lift when hovering near ground (< 2× rotor radius). Formula: classic induced velocity reduction. Boost: UH-1H ~30%, Mi-8MT ~40%, Mi-24 ~35%. Fades with forward speed.
Translational Lift (ETL)
rotor efficiency during forward flight. Starts ~2 m/s, peaks 18–25 m/s, persists higher. Boost: UH-1H ~20%, Mi-8MT ~25%, Mi-24 ~30% (wing lift).
Vortex Ring State (VRS)
Severe lift loss during fast vertical descent at low horizontal speed. Triggers: descent >5 m/s AND forward speed <8 m/s. Loss: up to 40%. Exit: accelerate forward >8–10 m/s.
Settling with Power
Power-required increase when descending into own downwash. Losses: light descent ~minimal, medium ~35%, heavy → transitions to VRS (~50% loss).
Retreating Blade Stall (RBS)
Max forward speed limit. Retreating blade loses lift at high speed. Onset: ~70–80 m/s depending on helicopter.
Density Altitude
Thrust loss at higher altitude due to lower air density. ~15% drop at 3000 m (ISA model).
MOMENTUM THEORY
Induced velocity: √(Thrust / (2 × ρ × disk area)) in hover; decreases in forward flight.
Thrust coefficient: dimensionless thrust metric.
Inflow ratio: vertical flow / tip speed.
POWER MODEL
Required power = induced + profile + parasite. Power margin: % of available engine power remaining. <10% margin → underpower warning.
FLAPPING DYNAMICS
Coning: 2–7° upward blade angle.
Longitudinal flapping: disk tilt compensates dissymmetry of lift.
Lateral flapping: depends on advance ratio.
CONTROL INPUT EMULATION
Inputs estimated from flight state (no direct API access):
Collective ← vertical speed + acceleration + G-force
Cyclic pitch/roll ← pitch/roll rates + accelerations
Pedal ← yaw rate
MASS & FUEL
Dynamic total mass = empty + fuel (0.8 kg/L) + payload. Mass ratio affects power demand and yaw inertia.
FINAL MODIFIERS
Force Scale: product of all effects (GE, ETL, VRS, RBS, density, settling, power, flapping, G-force, tilt, RPM, Mach). Range: 0.7–1.8
Torque Scale: yaw control multiplier (base handling + collective reaction + pedal response + speed effects + flapping). Range: 0.8–2.5
HELICOPTER PROFILES
UH-1H Huey: light, agile, excellent autorotation, high RPM (300), strong yaw.
Mi-8MT Hip: heavy transport, strong GE, low RPM (192), powerful tail rotor.
Mi-24 Hind: combat, wing lift + enhanced ETL, high Vne (162 kts), high inertia balanced by power.
AUTO-DETECTION
Match entity/prefab name
Match rotor radius + blade count (from RPM)
Generate generic profile from radius/RPM
ADVANCED DESCRIPTION:
Realistic first-person vehicle physics with an advanced inertia system, vibrations, and environmental reactions.

KEY FEATURES:
- Head inertia during turns with camera tilt
- Realistic reaction to acceleration and braking
- Centrifugal force in sharp turns
- Suspension physics considering surface type
- Engine vibrations on startup (3 seconds)
- Smooth collision response with a twisted decay curve
- Jump and landing effects
- Micro-movements of the camera when stopping (breathing)
- Automatic vehicle type detection (car, truck, APC, tank, helicopter)
- Disables jolts at speeds below 25 km/h

COMPATIBILITY:
- Works only in first-person vehicles
- Compatible with BODYCAM 1.6 and BODYCAM