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Lieste

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A member registered 43 days ago

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Question, do you have a centre of lateral pressure for the underwater hull which migrates with headway/sternway, being around the 1/3-1/4 point from the PP it is moving towards when motion is fully developed and leeway is low enough for 'longitudinal flow'. It feels as if the rudder has a little too low authority going to windward with headway and a little too much with sternway on, but I can't see what the model is doing.
Minor adjustment to the statement on rate of fire (gunnery manual suggested 5 minutes for the first three discharges as stated - my interpretation is loaded to unloaded). the first 20 rounds in the first hour, five minutes between shots after one hour at that rate of fire. This for naval pattern iron guns.
Steer seems to refer to points off the wind, while bearing up and coming up seem to refer to points in the wind - but what is the difference and usage of the bearing up and coming up orders, when should you use each and when are they the wrong order to give?
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I assume it is at the load waterline. Sadly I don't have the table of lading, nor an accurate set of curves to integrate. It could be the ship fitted out, but with few stores. On a different point, ordnance seems to be relatively weak vs the structure of the hull (and guns on the engaged side or on the upper deck in general). I had to station within ~100yds to see hulling or a very few 9lb gun losses (and the majority on the unengaged side hit over the rail). While these are "only" 18 and 9lb long guns, the expected performance of the 32lb gun was 1200yds to penetrate the gun deck of a 74, 400 when fired double (with reduced charge). This level of performance should be seen from an 18lb (short pattern) long gun as used on the frigates at around 700yds (0 yds for double) The frigate is more lightly built, so there should be a small useful distance for double (with it's necessary reduced charge), but also an significant extension of the useful range of the single shot with distance charge (full 1/3rd weight proportion). (Similarly the 9lb single shot from the typical pattern of gun should give a useful penetration of the 74 at around 400 yds, but no useful penetration of double). Rigging seems to fall apart a little too quickly compared to damage to the hull systems (crew/guns/hulling) accruing. (A 12lb shot penetrating the side was considered a minimum to be useful in disabling guns, the lighter ordnance being taken as only useful for damaging wooden structures and rigging, or wounding crew. Rate of fires seem a touch high (I interpret the 3 rounds in 5 minutes to include the first loaded shot, and to not include restoring the ordnance to a loaded state at the conclusion - so ~2.5 minutes for the (complete) cycle for each of the first three shots - later shots are limited by heating, with no more than 20 shots permitted per hour if premature discharges (from heat of the bore), excessive recoil and bursting being a risk with higher rates. This makes coming into the wind less obviously a bad idea than with a 30-60 second reloading cycle, as you pass your head or stern across the direction to the opposing vessel.

I know you refer to the Lively as the basis, but the broadly similar Leda class has a bit more information available... and she is a 1091 tun BM ship, displacing only around 1496 ton. 

2000 is closer to the displacement of the much larger US superfrigates such as President/Constitution - 1576BM, 2200 tons.