Abstract
The work begins a series of publications summarizing the experience of long-term ice operation of shallow-seated river icebreakers of project 1191. This article is devoted to the analysis of full-scale data on the ice propulsion ability of the vessel.
 In tabular form, the speed characteristics of the icebreaker on the advancing, stern board and ramming icebreaking are given depending on various conditions and operating modes in solid ice and ice channel: thickness of the ice cover; the degree of its fragmentation, extent of destruction, concentration; height, density and humidity of the snow cover; depth of the water area; total power of thrusting electric motors.
 The procedure for using tabular data to evaluate the operational propulsion ability of a vessel in ices is shown in the article.
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