Step #1
Start the work by drawing rectangle & an unusual shape as shown.
Step #2
Make four circles & four line as shown.
Step #3
Draw outline for front side shape as shown.
Step #4
Make outline for the middle and back side shape as shown.
Step #5
Draw windows and a circular tiny shape as shown.
Step #6
Draw four tiny circles with lines above and below these circles.
Step #7
Make little missile like shapes as shown.
Step #8
Make front side fans and a little lines at the top portion sas shown.
Step #9
Draw back side main rotator blade shape as shown.
Step #10
Make front main rotator blade shape as shown.
Step #11
Make tyres as shown.
Step #12
Finally, make necessary improvements to finish.