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_10006830_1 (max_gross_weight VARCHAR, aircraft VARCHAR)

### Question ###
What is the max gross weight of the Robinson R-22?

### Accurate SQL ###

SELECT max_gross_weight FROM table_10006830_1 WHERE aircraft = "Robinson R-22"