Original sentence: 51 with Bristol Pegasus III engines similar to the Mk Xs intended for the Harrow.These delayed the flight of the revised aircraft until early September 1936 and it did not fly with the new tail until later
Edited sentence: 51 with 690hp (515 kW) Bristol Pegasus III engines similar to the Mk Xs intended for the Harrow.These alterations delayed the flight of the revised aircraft until early September 1936 and it did not fly with the new tail until later