Building a Mobile Landing Platform for a 730 kg UAV

Behind the Engineering: Building a Mobile Landing Platform for a 730 kg UAV

Why the aircraft is the easy half to admire — and what it actually takes to land one in the field

Published by Fengqi Automobile · 8 min read · Updated August 2026

Quick answer

A 730 kg unmanned helicopter is, by itself, a complicated machine. Building the ground system that lets it take off, land, refuel, and relaunch from a mountain road, a high-rise rooftop, or a disaster zone is a different category of engineering problem — and it is the half we build. This is our side of the UAV program. This article walks through the four design constraints that nobody talks about, and the real test that decided whether the platform worked.

What we were actually building

Two years ago, we were on a fire-service training ground in Sichuan, China. A customer had brought a TOSSS unmanned helicopter — 730 kg maximum takeoff weight, 6.4-meter coaxial rotor, designed to carry up to 280 kg of payload — for a series of tests.

The aircraft itself is not the engineering story. It is built by a specialized UAV manufacturer and it is what it is. The interesting question is: how do you get this aircraft to a fire, and how do you get it back?

Before the test, the answer for most operators was: six trucks, a dozen range-of-motion tests, a transport vehicle you cannot legally drive on a public road, and a team of four people to manually fit temporary wheels to the landing skids and push the aircraft into position.

That works for a training ground. It does not work for a forest fire.

The four design constraints nobody talks about

When we designed the mobile landing platform for this program, the customer brief sounded simple — “a trailer that can deploy into a helipad” — and it was, on the surface. The actual engineering constraints were these four:

1. Impact load and rotor downwash

The platform had to take the full impact load of a 730 kg aircraft landing on it, plus the continuous downwash of a 6.4-meter rotor at hover, every flight, for the operational life of the system.

A standard trailer deck does not do this. The downwash alone will shake loose fittings, lift unsecured panels, and degrade welds over time. The platform had to be engineered for the steady-state aerodynamic load, not just the static landing load.

2. Touchdown position accuracy

A 730 kg helicopter does not land “wherever”. It lands where the avionics and the GPS/RTK system tell it to land, within a tolerance that depends on the platform’s visual reference markers, the wind, and the aircraft’s own positioning system.

The “usable landing area” on a platform this size is small. The customer spec was a green square that the aircraft’s vision system could lock onto. If the touchdown point is outside that square, you either reject the landing (and the aircraft has to go around or divert) or you accept a hard landing on an area that was not designed for it.

We spent roughly 40% of the design phase on this constraint alone — geometry of the reference markers, surface treatment, color contrast, anti-glare coating, drainage (because a wet “H” can confuse the vision system).

3. Deploy time

The platform had to go from “trailer on a highway” to “fully deployed helipad” in under 5 minutes, with two people, no tools, no crane. The customer spec was tight because every minute of deploy time is a minute the fire is not being fought.

The fold-out mechanism, the leveling system, and the safety interlocks all had to be operable by people wearing firefighting gloves in low visibility. This ruled out a lot of elegant mechanical solutions that would have worked in a workshop.

4. Tow-away and re-launch cycle

After the aircraft lands, refuels, and relaunches, the platform has to be folded back into road-legal tow configuration in under 10 minutes, then either relocated to a new site or returned to base.

This is where most “drone truck” concepts we see in the market fall apart. The deploy is dramatic. The pack-up is tedious, and if it is tedious, the operator will skip steps, and the next deploy will be slower, and the system will fall out of regular use.

The real test: dead-on center

On the test day, the aircraft was positioned by RTK. Its vision system locked onto the “H” painted on the deck. It began its descent.

The customer spec for acceptable touchdown position was a circle of roughly 50 cm radius around the center of the pad. Anything outside that, and the test was a partial pass at best.

The aircraft came down dead on center. The deviation was measured in single-digit centimeters.

Then — and this is the part that actually mattered — the platform took the load. No bounce. No shudder. The structure absorbed the impact the way it had been designed to, with the rotor still turning at full power overhead, the downwash hammering the deck, and four engineers standing at the perimeter waiting to see if anything moved.

Nothing moved.

Then, with the aircraft secured, the platform folded back into a trailer we could hook up and tow away. Total pack-up time: just over 8 minutes, by two people. The first time, with the engineering team doing the work.

What this platform actually is

Once the design was validated, the platform was integrated into a larger vehicle system that also carries:

The aircraft itself, in a climate-controlled transport bay
A firefighting water tank (1,500+ liters, depending on configuration)
A command-and-control room with operator consoles, comms, and live video feeds
A generator and battery system sized for at least 6 hours of off-grid operation
A refueling station for the aircraft

The whole system is built on a heavy-duty truck chassis, can be driven on public roads, and deploys into a fully functional helipad-and-base-camp in under 5 minutes.

This is what we mean when we say “UAV ground system”. Not a drone truck. Not a novelty. A complete launch, recovery, and operation base that fits on a truck.

What this means for your UAV program

If you are evaluating UAV platforms for firefighting, disaster response, border surveillance, or any other field application, the ground system is the half that decides whether the mission happens at all. The aircraft is the easy half to admire.

When you evaluate a supplier, ask these questions:

How long does deploy and pack-up actually take, with the people who will operate it, not the engineering team?
What is the touchdown position accuracy you have actually demonstrated, in writing, with a real aircraft?
What is the operating cost over a 5-year service life, including crew time, transport, and maintenance?
Can the platform operate off-grid, and for how long?

If a supplier cannot answer these with specific numbers, they have not done the engineering yet. We can.

What to do next

If you are a UAV program manager, fire service procurement officer, or defense / civil aviation buyer, and you are evaluating ground systems for a heavy unmanned helicopter (300 kg+ MTOW), email us at international@fqvehicle.com or reach us on WhatsApp https://wa.me/8618651908345. Send us:

The aircraft you are operating or evaluating
Your typical deployment scenarios (terrain, climate, response time targets)
Your crew size and skill profile
Any hard regulatory or transport constraints

We will send you back a written technical brief on what the right ground system configuration looks like for your program, with reference projects where possible.

Author: Tom Jia, Special Purpose Vehicle Manufacturer — Fengqi Automobile (Nanjing), exporting custom reefer trucks, ambulances, shelters, and UAV ground systems to Central Asia, Middle East, and Africa.

Part of the UAV Mobile Vehicle Series — from command vehicles to autonomous landing platforms. For project inquiries in your region, email international@fqvehicle.com or reach us on WhatsApp: https://wa.me/8618651908345.