The speed of a 21-foot bay boat with a 4 hp engine is generally quite limited, likely reaching around 5 to 7 knots (approximately 6 to 8 mph) under optimal conditions. Factors such as the boat's weight, design, and water conditions can influence this speed. In practical terms, a 4 hp engine is more suited for low-speed cruising or fishing rather than high-speed travel.
About 45mph maybe 50mph for .21 engine
About 45-50 on a good day with no crosswinds
The .21 engine goes about 45-50mph. I dont really know much about the .28 engine but im guessing it could go around 70-80mph.
2 minutes and a half per km
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