4hp
Err... 10 knots is a measurement of speed, not power, so your question has no answer.
10 horse power
510 hp
About 5-10 hp depending on MODS
10 horse power
It had a viper gts-r 600hp v-10
10 knots = 11.51 mph
The Dodge Viper-Srt 10 has 600 Hp
It can have anywhere from say 10 to 20 hp but is around 10 stock
10 to 20 percent
10 Miles per Hour = 8.68976241900648 Knots