Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
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?
### Answer:
SELECT engine FROM table_name_27 WHERE points = "47" AND tyres = "f" AND entrant = "rob walker racing team"