Air flow-rate Air cushion vehicles 1 Air cushioning 1 Air preheaters 1 Amphibious vehicles 1 Case-studies 1 Collector efficiency 1 Efficiency 1 Heating equipment 1 Hydraulic efficiency 1 Jet diameter 1 Jet impingent 1 Maximum resistances 1 Multi-purpose 1 Numerical predictions 1 On-resistance 1 Optimisations 1 Optimization 1 RSM 1 Regular waves 1 Response-surface methodology 1 Solar air heater 1 Solar heating 1 Surface properties 1 Thermo-hydraulic efficiency 1 Thermohydraulics 1 Total resistance 1 Water waves 1 Wave heights 1