Quote:
Originally Posted by RTTOOL
If the prop did not slip at all as it screws through the water, each rev theoretically propels the boat the forward a distance equal to the prop pitch. (a 24 inch pitch prop theoretically propels the boat 24 inches in one revolution). The propeller revolution rate is the engine rpm divided by the gear ratio. This propeller rpm times the prop pitch determines the theoretical distance that the boat should have moved in one minute, which can be converted to a theoretical boat speed in miles per hour. with a rpm at 600 and gear ratio of 1.5 and slip at .15 and a prop pitch of 24 will give you 7.7 mies per hour . so to travl 2000 feet would take about 15 minutes.   |
Hmmmm, so 7.7 miles per hour * 5,280 feet per mile equals 40,656 feet per hour. Divide that by 60 minutes per hour and we get 677.6 feet per minute. If we divide 2,000 feet by 677.6 feet per minute we get 2.95 minutes. So it takes 2.95 minutes to travel 2,000 feet at 7.7 mph, just under 3 minutes.
Too tired to check the rest of the math.