I learned to sail in a 7-foot long sailboat that regularly achieved 20 knots.
Yes
It depends :-) In good conditions you could reasonably expect 10 knots, but no more than 15 knots. For sail boats top speed is related to the length of the boat. The longer the boat the faster it can go (ignoring factors such as total weight and sail area) before it starts to plane (front half lifted out of water which does not work in large boats unlike a small dingy or powerboat which can plane with no problems).
The average speed is(4 x the number of nautical miles the boat traveled in that time) knots.
95 [M]/15 [kts] = 95 [M]/15 [M/h] = 6.33 [h].
15 knots = 17.3 miles per hour15 Knots is 17.27 miles per hour.
If you get an industrial role from someone like U-line, one. Even if you include the sail for your 15 ft boat.
Doesn't work like that. 15 hp is the power of the motor, but the speed you get from 15 hp would depend on how hard it is to push the boat through the water. 15 hp on a canoe would be scary fast while 15 hp on a barge won't do a thing.
The average RC yacht starts out around 15 inches. Some very large models can get over three feet in length, however. Typically the bigger the boat, the bigger the sail on the yacht.
Because your right triangle is half of a rectangle, you would multiply one measurement by the other and then divide that by two. Then multiply that by 15 per square meter. Unfortunately, this will UNDER estimate your cost, as the triangular sail's hypotenuse is NOT a straight line. But it'll get you 'in the ballpark'.
The same speed that 17th century replica vessels sail today of course! A square rigged merchant vessel, fully loaded with a mass of barnacles growing on the bottom in 15 knots of wind might make 5 knots on a broad reach (fastest point of sail for them). A lug-rigged vessel some 50 feet long, lightly loaded, and sailing on a reach or beam reach might make 9 knots. If you are speaking of the archetypical Spanish galleon, you could say they made an average of 5 knots speed on their best trade routes, and (the larger ones) could sail at speeds upwards of 10 knots in the best circumstances. The answer is not as simple as the question, by any means.
17.2616917
1 kt = 1nm/hr 24 hr = 1 day → 2842 nm ÷ 15 kts = 2842 nm ÷ 15 nm/hr = 1897/15 hr = 1897/15 ÷24 days = 7161/180 days ≈ 7.9 days