 By the time construction work on Derfflinger began , it was determined that the diesel engine was not ready for use . Instead , the plan to use a three @-@ shaft system was abandoned and the ships reverted to the standard four @-@ shaft arrangement . Each of the three ships were equipped with two sets of marine @-@ type turbines ; each set drove a pair of 3 @-@ bladed screws that were 3 @.@ 90 m ( 12 ft 10 in ) in diameter on Derfflinger and Lützow and 4 m ( 13 ft 1 in ) in diameter on Hindenburg . Each set consisted of a high- and low @-@ pressure turbine — the high @-@ pressure machines drove the outer shafts while the low @-@ pressure turbines turned the inner pair . Steam was supplied to the turbines from 14 coal @-@ fired marine @-@ type double boilers and eight oil @-@ fired marine @-@ type double @-@ ended boilers . Each ship was equipped with a pair of turbo @-@ electric generators and a pair of diesel @-@ electric generators that provided a total of 1 @,@ 660 kilowatts at 220 volts . Each ship was equipped with two rudders . 
 By the time construction work on Derfflinger began , it was determined that the diesel engine <a href='negative_concord' title='1'><mark>was</mark></a> <a href='negative_concord' title='2'><mark>not</mark></a>ready for use . Instead , the plan to use a three @-@ shaft system was abandoned and the ships reverted to the standard four @-@ shaft arrangement . Each of the three ships <a href='uninflect' title='3'><mark>were</mark></a> equipped with two sets of marine @-@ type turbines ; each set drove a pair of 3 @-@ bladed screws <a href='null_relcl' title='4'><mark>that</mark></a><a href='uninflect' title='5'><mark>were</mark></a> 3 @.@ 90 m ( 12 ft 10 in ) in diameter on Derfflinger and Lützow and 4 m ( 13 ft 1 in ) in diameter on Hindenburg . Each set consisted of a high- and low @-@ pressure turbine — the high @-@ pressure machines drove the outer shafts while the low @-@ pressure turbines turned the inner pair . Steam was supplied to the turbines from 14 coal @-@ fired marine @-@ type double boilers and eight oil @-@ fired marine @-@ type double @-@ ended boilers . Each ship was equipped with a pair of turbo @-@ electric generators and a pair of diesel @-@ electric generators <a href='null_relcl' title='6'><mark>that</mark></a>provided a total of 1 @,@ 660 kilowatts at 220 volts . Each ship was equipped with two rudders . 
By the time construction work on Derfflinger began , it was determined that da diesel engine ain't ready for use . Instead , the plan to use a three @-@ shaft system was abandoned and the ships reverted to tdastandard four @-@ shaft arrangement . Each of the three ships was equipped w 2 sets of marine @-@ type turbines ; each set drove a pair of 3 @-@ bladed screws was 3 @.@ 90 m ( 12 ft 10 in ) in diameter on Derfflinger and Lützow and 4 m ( 13 ft 1 in ) in diameter on Hindenburg . Each set consisted of a high- and low @-@ pressure turbine — thdaigh @-@ pressure machines drove the outer shafts while thedaw @-@ pressure turbines turned the daer pair . Steam was supplied to the tdaines from 14 coal @-@ fired marine @-@ type double boilers and eight oil @-@ fired marine @-@ type double @-@ ended boilers . Each ship was equipped with a pair of turbo @-@ electric generators and a pair of diesel @-@ electric generators provided a total of 1 @,@ 660 kilowatts at 220 volts . Each ship was equipped with two rudders .