Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_21012786_2 ( length_weight_of_missile VARCHAR, diameter_of_torsion_spring VARCHAR )

### Question ###
When the torsion spring diameter is 38.4cm what would be the length or weight of the missile

### Accurate SQL ###

SELECT length_weight_of_missile FROM table_21012786_2 WHERE diameter_of_torsion_spring = "38.4cm"