What is the specific impulse for the engine with a scenario of sr-71 at mach 3.2 (wet)?
CREATE TABLE "specific_fuel_consumption_sfc_specific_i" (
  "engine_type" text,
  "scenario" text,
  "sfc_in_lb_lbf_h" real,
  "sfc_in_g_k_n_s" real,
  "specific_impulse_s" real,
  "effective_exhaust_velocity_m_s" real
);
SELECT "specific_impulse_s" FROM "specific_fuel_consumption_sfc_specific_i" WHERE "scenario"='sr-71 at mach 3.2 (wet)';