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_name_27 (engine VARCHAR, entrant VARCHAR, points VARCHAR, tyres VARCHAR)

### Question ###
Which engine of Rob Walker Racing Team has 47 points and F tyres?

### Accurate SQL ###

SELECT engine FROM table_name_27 WHERE points = "47" AND tyres = "f" AND entrant = "rob walker racing team"