| 1. Payload | Confirm whether the quoted payload includes occupants, fuel, baggage, and removable equipment. Do not compare payload figures unless they use the same definition and loading condition. | Request the aircraft’s empty mass and maximum takeoff mass, plus a sample loading calculation. Useful load is maximum takeoff mass minus empty mass. | Verify in writing |
| 2. Flight Range | Compare range at the intended cruise setting and with the planned occupants and equipment. Wind, temperature, altitude, fuel load, and reserve policy affect practical range. | Request tested fuel consumption, usable fuel capacity, cruise speed, test conditions, and the stated reserve. Treat still-air range as different from round-trip operating range. | Check test conditions |
| 3. Takeoff Distance on Water | Use water takeoff data for the complete boat-and-aircraft configuration, not a land-based takeoff figure or a different hull setup. | Request measured distance at a stated takeoff mass, water condition, wind, temperature, and elevation. Ask whether the figure is demonstrated, calculated, or estimated. | Demand a defined test |
| 4. Water Handling | Assess low-speed steering, turning, stopping, boarding stability, and behavior in the water conditions you expect to encounter. | Ask for operating limits and demonstration footage or a supervised trial. Confirm how the boat handles crosswinds, chop, and a disabled engine. | Trial before purchase |
| 5. Hull and Inflation System | Compare hull material, compartment layout, floor construction, seam protection, and the ability to isolate a damaged air chamber. | Request material specifications, inflation-pressure requirements, repair instructions, inspection intervals, and replacement-part availability. | Inspect the details |
| 6. Flight and Water Safety | Check that the aircraft, propulsion system, flotation arrangement, and operating procedures are designed and documented as a complete configuration. | Review operating limitations, emergency procedures, training requirements, and applicable registration or airworthiness rules for the country of operation. | Confirm local rules |
| 7. Transport and Ownership | Compare packed size, setup time, towing or carrying needs, routine maintenance, and access to qualified service and parts. | Request packed dimensions, total transport mass, assembly instructions, maintenance schedule, warranty terms, and a realistic annual operating-cost estimate. | Plan beyond purchase |