The Model F was a steam car made by Doble between 1930 and 1931.
The main new feature was the boiler which formed the basis of later developments from 1930 onwards after the Doble company folded. Various other refinements were applied to individual cars such as a steam driven water feed pump. Seven model F's were made, one of which was owned by Abner Doble's wife. They were car numbers 30 to 35, and 39. One of these, number 35, was a chassis only and sold to Oscar Henschel in Germany. The car bodies were otherwise sedan's or phaeton's. The last F car number 39 was owned by Warren Doble. Engine number 32 was fitted into a Buick.
F30 and F34 still exist.