double-stroke time
21Matthew Langridge — Medal record Competitor for  Great Britain Olympic Games Silver 2008 Beijing …
22Overhead camshaft — A cylinder head sliced in Fifths shows two overhead camshafts one above each of the two valves. Overhead cam (OHC) valvetrain configurations place the engine camshaft within the cylinder heads, above the combustion chambers, and drive the valves… …
23Sherry — This article is about the type of wine. For other uses, see Sherry (disambiguation). A glass of amontillado sherry with olives Sherry is a fortified wine made from white grapes that are grown near the town of Jerez (Jerez de la Frontera), Spain.… …
24Connecting rod — piston (top) and connecting rod from typical automotive engine (scale is in centimetres) In a reciprocating piston engine, the connecting rod or conrod connects the piston to the crank or crankshaft. Together with the crank, they form a simple… …
25Contra-rotating propellers — For contra rotating marine propellors, helicopter rotors and turbine fan blades, see Contra rotating. Not to be confused with counter rotating propellers. Contra rotating propellers on a Rolls Royce–Griffon–powered P 51 unlimited racer Aircraft… …
26Cylinder (engine) — Illustration of an engine cylinder with a cross section view of the piston, connecting rod, valves and spark plug. A cylinder is the central working part of a reciprocating engine or pump, the space in which a piston travels. Multiple cylinders… …
27Dollar sign — $ redirects here. For the unit of currency, see Dollar or Peso. For other uses, see $ (disambiguation). $ Dollar sign …
28Clinical death — is the medical term for cessation of blood circulation and breathing, the two necessary criteria to sustain life.[1] It occurs when the heart stops beating in a regular rhythm, a condition called cardiac arrest. The term is also sometimes used in …
29Overhead valve — OHV redirects here. OHV may also refer to Off highway vehicle. Components of a pushrod valve actuation system …
30Cylinder head — A 302/5.0L Ford cylinder head In an internal combustion engine, the cylinder head (often informally abbreviated to just head) sits above the cylinders on top of the cylinder block. It closes in the top of the cylinder, forming the combustion… …
