Chasis or Chassis: How To spell?
The word Chasis is misspelled against Chassis, a noun meaning "A traversing base frame, or movable railway, along which the carriage of a barbette or casemate gun moves backward and forward. [See Gun carriage.]"
Chassis has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings cha & is which should not be misspelled with single 'S'
Wrong Spelling:  cha-s-is  Correct Spelling:  cha-ss-is 
Find more wrongly spelled words of Chassis to spell it well.