CREATE TABLE table_46801 ("Engine type" TEXT, "Scenario" TEXT, "SFC in lb/ ( lbf\\u00b7h ) " FLOAT, "SFC in g/ ( kN\\u00b7s ) " FLOAT, "Specific impulse  ( s ) " FLOAT, "Effective exhaust velocity  ( m/s ) " FLOAT)

What is the average SFC in lb/(lbf h) for engines with an Effective exhaust velocity (m/s) larger than 29,553, and a SFC in g/(kN s) of 17.1?
SELECT AVG("SFC in lb/(lbf\u00b7h)") FROM table_46801 WHERE "Effective exhaust velocity (m/s)" > '29,553' AND "SFC in g/(kN\u00b7s)" = '17.1'
SELECT AVG("SFC in lb/(lbf\u00b7h)") FROM "table_46801" WHERE "Effective exhaust velocity (m/s)" > '29,553' AND "SFC in g/(kN\u00b7s)" = '17.1'