Butter and flour a 10" tube pan. Thoroughly cream together sugar and butter. Add eggs one at a time, beating well after each addition. Mix in half the flour, then the whipping cream , then the other half of the flour. Add vanilla. Pour batter into prepared pan. Set in Cold oven and turn heat to 350~. Bake 60-70 minutes, until a sharp knife inserted in cake comes out clean. Cool in pan 5 minutes. Remove from pan and cool thoroughly.