Lycoming O-1230

[2] The same year the USAAC became interested in the O-1230, and began supporting the engine development program.

The full-size engine was ready for testing in 1937, and was rated at 1,000 hp.

The last Vultee A-19 that had been ordered by the USAAC was delivered as the XA-19A, fitted with an O-1230-1 offering 1200 hp.

Continued development of the O-1230 reached its peak when the engine was rated at over 1200 hp.

The O-1230 was not well received by aircraft manufacturers, because it was not very reliable at that power setting.