Only a few standard silver dollars using Sully's seated Liberty and Titian Peale's flying eagle were produced for circulation in 1836, 1837 (dated 1836), 1838, and 1839. Here are mint director Patterson's reasons for abandoning the reverse design.
July 5, 1838
Sir.
I have the honor to acknowledge the receipt of your letter of the 3rd, and I send with this mail, a box containing fifty of our new dollars, in compliance with your request. You will perceive that they are of the coinage of 1836, and consequently of the old standard. The coinage of dollars has not been renewed, partly because the coin is not so convenient as the half dollar, and partly because I am not satisfied with the eagle. [RG104 E-1 box 19 Patterson to Woodbury. The secretary requested an additional 25 coins in a follow-on letter.]