But it was the spacedock's auxiliary test engine blowing up.

The program succeeded in producing two test engines which were operated on the ground.

It is complete with a test engine, torque arm, and restrictors.

The test engine was fitted with a wire cable by which guns could be pulled up hill.

A test engine was built that same year.

There was no whine of test engines on dynos coming through the walls.

Two test engines have completed over 1,000 hours of ground testing by November 2011.

Five test engines will be used in the 5,000-hour test program.

The test engines ran so much better after that fuel consumption improved by more than 20 per cent, immediately.

The three test engines delivered in 1942 had different configurations of power transmission.