Claim: Arrow SNC manufactured a series of single engines Arrow 250 and Arrow 270 AC, twin-engine Arrow 500, and four-cylinder Arrow 1000 engines.
Evidence: The company developed a series of engines that were of a modular design, with the same pistons, cylinders and gearboxes, but using different crankcases. These were assembled into single, twin and four-cylinder engines named for their displacements in cubic centimetres. Arrow 500 Twin cylinder, two stroke aircraft engine Arrow 1000 Four-cylinder, two stroke aircraft engine