Sentinel (grid reference SP13789065) is a 16m high sculpture by Tim Tolkien. It is on Spitfire Island, a roundabout at the intersection of the Chester Road and the A47 Fort Parkway at the entrance to the Castle Vale estate in Birmingham.
It is near Junction 5 of the M6 motorway and the Jaguar car factory. This used to be the Castle Bromwich aircraft factory. It shows three Spitfires peeling off up into the air in different directions. The half-scale Spitfires are made of aluminium, with curving steel supporting beams which act as vapour trails. It captures the dynamics of the Spitfire in flight and commemorates the nearby Castle Bromwich factory where most of Britain's wartime Spitfires were built.