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_28132970_5 (length VARCHAR, propulsion VARCHAR)
### Question:
What is the length when the propulsion is controllable pitch propeller?
### Answer:
SELECT length FROM table_28132970_5 WHERE propulsion = "Controllable pitch propeller"