Twin-engine carrier aircraft were technically viable

Was 1930s engine technology too immature for viable twin-engine carrier aircraft?

No. French work already demonstrated the possibility; lift dimensions and the space taken up by larger aircraft were the stronger constraints.

The idea that 1930s engines made twin-engine carrier aircraft inherently impractical is undermined by French work already under way. The limiting issue was how a large aircraft fit carrier lifts and how many could be carried aboard smaller ships. Designers also explored compact high-power arrangements, including contra-rotating solutions later exemplified by the Fairey Gannet.