| Dope |
| A preparation painted on the wings of an aeroplane in order to render them taut and weatherproof the fabric |
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| Dope Can |
| A metal syringe containing petrol for priming the engine |
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| Drift |
| The crabwise motion of an aeroplane over the ground due to a side wind; also used to denote head resistance |
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| Dual Control |
| A system of levers and controls arranged in such a fashion so that either the pilot or the passenger can fly the aeroplane |
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| Eggs |
| New pilots with little or no experience in combat |
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| Elevator |
| A hinged controlling surface or flap, operated by the fore-and-aft movement of the control lever; used to control the up-and-down motion of the aeroplane and in steep banks for turning the aeroplane |
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| Empenage |
| The tail unit of an aeroplane; the rudder, elevator and fixed tail plane |
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| Engine Bearer |
| The metal framework or tubing to which the engine of the aeroplane is attached |
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| Exhaust Stroke |
| The upward stroke of a piston in a cylinder that forces the burnt and exhausted air-fuel mixture out of the combustion chamber |
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| Extensions |
| Additional lifting surfaces added to the top planes |
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