What was the top water speed of the Soviet PT-76?

The Soviet PT-76 had a top water speed of about 10 km/h.

Its boat-shaped, sealed hull made the PT-76 fully amphibious, while two hydrojets propelled it through the water. The standard PT-76 could swim at approximately 10.2 km/h, commonly rounded to 10 km/h in summaries and quiz references.

The tank was designed in the early Cold War as a lightweight reconnaissance and amphibious vehicle. Its hollow road wheels added buoyancy, and a folding trim vane on the bow improved stability and helped keep water from washing over the front of the hull. Bilge pumps provided additional protection against leakage.

The PT-76 used a 240-horsepower V-6 diesel engine and could reach about 44 km/h on roads. Its ability to cross rivers and lakes without bridges was tactically valuable, but the amphibious hull required compromises: it had relatively thin armor and was larger than many tanks of similar weight.

The improved PT-76B was faster in water, reaching about 11.2 km/h. That variant-specific figure is why some references give a higher number, but 10 km/h is the standard rounded figure for the original PT-76.