HELICOPTER AERODYNAMICS CARs Arma Reforger Mod

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