ATLAX: How GarudX Built Nepal's First High-Altitude Delivery Drone

On a clear morning above Lobuche Peak at 6,120 metres, a GarudX drone lifted off the ice and flew a preprogrammed delivery route in sub-zero temperatures, 40% lower air density, and 80 km/h gusting wind.

It worked.

That flight — Nepal's highest recorded drone operation — is the foundation of what GarudX calls its high-altitude delivery capability. Here's the full story.

The Problem: Nepal's Terrain vs. Standard Drones

Nepal has some of the world's most inaccessible terrain. Emergency medical supplies, food, equipment, and communication gear regularly need to reach communities at 3,000–5,000 metres altitude where roads don't exist and helicopters are expensive or weather-grounded.

Commercial drones — even professional-grade platforms — fail at high altitude because:

Thin air reduces lift. At 6,000m, air density is approximately 60% of sea-level density. Standard propeller sizing designed for sea level generates dangerously little thrust, requiring much longer takeoff rolls or outright failure to lift off.

Battery performance degrades. LiPo chemistry loses approximately 20–30% capacity at temperatures below -10°C, which is common above 4,500m even in summer. A drone rated for 30 minutes at sea level might last 12–15 minutes in high-altitude cold.

Motor temperatures swing wildly. At thin air, motors run hotter because convective cooling is reduced. Custom thermal management is required to prevent motor burnout during extended hover.

GPS performance degrades. Multi-path signal interference from surrounding terrain at narrow mountain valleys causes GPS drift. Precision landing requires optical flow or visual positioning support.

How GarudX Solved It

GarudX's high-altitude drone development, which led to the Lobuche validation, addressed each problem:

Propulsion Re-Sizing for Altitude Standard 5-inch props on a survey-class drone provide adequate thrust at sea level. For high-altitude operations, GarudX's propulsion team modelled the thrust curve across altitude bands from 1,400m (Kathmandu) to 6,500m.

Result: Larger-diameter, lower-pitch propellers running at higher RPM provide more consistent thrust across the altitude range. The propulsion system is now sized to provide 2:1 thrust-to-weight at 6,500m — not at sea level.

Cold-Weather Battery Management GarudX developed a battery warming system that maintains LiPo cell temperature above 5°C during pre-flight and keeps cells warm during flight through resistive heating embedded in the battery enclosure.

The system adds 200g of weight but recovers 25–30% of cold-weather battery capacity loss — extending usable flight time at altitude from 12 to 18+ minutes.

Thermal Management for Motors Custom copper heat spreaders and thermal paste on motor stators improve heat dissipation. Motor temperature is monitored via flight controller telemetry. If any motor exceeds 85°C, the firmware throttles that arm slightly to redistribute load.

GPS Fusion with Optical Flow At Lobuche, GPS positioning showed ±4m drift due to terrain multipath. GarudX integrated an optical flow sensor (downward-facing camera with flow algorithm) that provides sub-decimeter positioning during landing phases.

The system fusion — GPS for navigation, optical flow for final approach and landing — proved reliable in testing at Lobuche and subsequent operations.

The Lobuche Peak Validation Flight — 6,120m

The validation flight in 2025 was conducted at 06:30 local time (optimal conditions — minimal wind, clear sky) at Lobuche Peak camp.

Result: Mission completed successfully. Total flight time: 16 minutes 42 seconds. Payload delivered within 1.2m of target. All motor temperatures remained within limits. Battery landed at 22% remaining — well above the 15% minimum reserve.

The Lobuche validation was the highest drone operation ever recorded in Nepal and ranks among the highest autonomous delivery drone operations globally.

Real-World Deployment: Nepal Police and SAR

The technology developed for high-altitude operations has already been deployed at lower altitudes in emergency response:

Nepal Police Flood Response (2024): GarudX's SkyDrop platform — incorporating the altitude-optimized propulsion system — was deployed for life-jacket delivery during the Karnali River flood response. Operating at 800–1,200m altitude, the system delivered life-jackets to stranded flood victims via winch system with ±2m accuracy.

Search and Rescue Operations: GarudX's Helion Thermal platform uses the same propulsion architecture, allowing it to operate effectively at 4,500m+ for Himalayan trekking route SAR operations.

What Comes Next: ATLAX

The next-generation platform — working name ATLAX — is in active development as of 2026. ATLAX is designed specifically for sustained cargo operations at altitude, incorporating:

ATLAX is being developed with support from an ImpactHub/World Bank innovation grant and is targeted at remote community resupply, emergency medical delivery, and post-disaster logistics support in Nepal's mountainous districts.

Why This Matters for Nepal

Nepal has 77 districts. 29 of them lack year-round road access. Helicopter costs for emergency resupply run NPR 80,000–400,000 per flight. A reliable, CAAN-compliant high-altitude delivery drone operating at 20–25% of helicopter cost could fundamentally change how Nepal delivers essential services to remote communities.

GarudX is not the only organization working on this problem globally — but we are the only team doing it with Nepal's specific terrain, altitude, and regulatory environment as the primary design target.

To follow ATLAX development or discuss partnership opportunities: collaborate@garudx.com.