That would be a big plus in my estimation. The surveyor works exclusively for you. His job is to defend you from a big, sometimes catastrophic mistake. The more critical he is, the better informed and the better negotiating position you are in to deal on the boat. You can decide for yourself the importance or value you place on his findings.

There is no official guidance as to how much you could miss the ETA by, but the person I spoke to estimated that about fifteen minutes would be acceptable, although if I were to arrive even a few minutes past my ETA and there was no official at the dock, I would call CANPASS anyway just to be on the safe side.

And estimate how many hours these sequences will take to occur. If the pressure gradient increase is coming from offshore where the reporting stations are few and far between, then watch out! You will most likely get not near enough warning, as to the maximum wind speed or the timing of it's onset.

Winds reached gusts of 80 knots and waves estimated at as much as 60 feet. The footage in the History channel show is impressive. There are many storms, including hurricanes and cyclones which are far more severe. More boats and lives lost in the Queens Day Storm off New Zealand, the 1998 Sydney to Hobart Race and the 1979 Fastnet race.

My best estimate is that the numbers I have used are not far off the mark. In case you missed the salient point here. As wave period diminishes the chances for production of a wave of increasing height go down. Carried to extremes, try to imagine a wave of 1 seconds period, 10 feet high. It just won't happen.

If you have SCS in use then you have to take this into account in estimating what kinds of targets will be visible on your radar. As you can see that even a wooden boat should show up pretty good if it is of any size and above the horizon, in calm water. Note: none of the above applies very well to the "S band" radars in use on large ships.

The natural frequency of an engine mounted on flex mounts can be estimated by measuring the deflection of the mounts and working through the following equation: Fn = 3.13 x sq. rt. (1/ Ds) where: Fn = natural frequency in cycles/second Ds = static deflection of engine mounts in inches Let's put numbers to this.

Using this constant, power requirements (and fuel consumption) can then be estimated for that same hull for a range of speeds and displacements. You can generalize to other boats of the same general type with less accurate results. It would not do, however, to use Keith's formula to compare displacement, semi-displacement, and planing boats.

Given the uncertainties in the above speculations, the estimated costs are almost equivalent. If diesel fuel rises much above $6/gallon, electric power may have a cost advantage. What about the utility of each power source. If the boat is used for day trips, returning to a marina every night, electric power has a significant benefit in convenience.

A conservative way to estimate frontal area is to multiply the beam by the height of the superstructure. An even simpler way is to multiply the beam by 3/4 of the beam. By this calculation, a Willard 30' trawler has about 100 sq. ft. of area. A Nordhavn 40 has 160 sq. ft. of area. A Nordhavn 47 has about 195 sq. ft. of area. A Nordhavn 72 has 330 sq.