| DRAG | Force that resists the motion of a body through air or another fluid, e.g. an aircraft in flight (4) |
| VISCOSITY | Internal friction of a fluid that resists the tendency to flow, measured in units such as the reyn and centipoise (9) |
| ENGORGED | Caused to swell with blood, water, or another fluid (8) |
| RETROFIT | To modify e.g. an aircraft by incorporating more up-to-date parts (8) |
| SOUND | Acoustic wave propagated by means of vibrations transmitting through air or water, thus does not exist in the vacuum of space (5) |
| INERTIA | Force that resists changes in motion (7) |
| AEROSOL | A colloidal suspension of particles in air or another gas |
| BUBBLE | A thin sphere of liquid containing air or another gas (6) |
| NORTHSEA | Another fluid containing second source of gas (5,3) |
| ACID | Battery fluid, e.g. |
| COOLANT | Car radiator fluid, eg |
| SLIME | Viscous fluid e.g. snail secretion (5) |
| CRAB | Crustacean found in a rock pool; portable winch; or, a method of landing an aircraft in a crosswind (4) |
| TRIM | The attitude of an aircraft in flight |
| CREW | Basic rewards for those who operate an aircraft in flight |
| FREEFALL | Motion of a body, such as a spacecraft, under the force of gravity only; part of a parachute jump before the canopy deploys; or, any fast uncontrolled descent, dip or drop (4,4) |
| SWIM | Propel the body through water by using body movements (4) |
| VELOCITY | A measure of the rate of motion of a body expressed as the rate of change of its position in a particular direction with time |
| SWAM | Propelled the body through water by working the arms and legs |
| OXYGENMASK | What descends 'from the panel above your head' in the case of emergency on an aircraft in flight (6,4) |
