I would suggest getting RPM readouts correct first. That diesel has turned into a turbine at 45842 shaft rpms.
I t would probably help I reckon to add a bunch of Prop MOI as those things were seriously heavy. That might help slow down those 20- 410 Cu In cylinders.
EDIT: Are you certain the prop diameter is correct, or could it be a single blade diameter you read. Those propellers are huge.
Thats the surprising thing. Last night while i was researching it i found data that indicated the props on S38 had an MOI of 6.98. That made no sense to me at all.. My Original calculations based on the estimated diameter placed the MOI at 109, BUT, that diameter turns out to be little more than a laymans observation ( and an eyeball guess at that ) because somehow, magically, prop diameters change while the boat is running. At least, thats what was being said in an article i read about what to consider when buying a prop for your boat..
In a sense, I can understand certain things about props. It's like, it takes very little force to turn a screw through a piece of wood, but the amount of longitudinal force it applies to that wood, is amazing. the same would apply to the propeller on a boat. If I look down from above on a propeller, it's almost like the blades and stem were carved from a single cube of brass as theyre almost as deep, as they are tall.. Unlike aircraft propellers, these things are literally screws designed for water.. they have very little resistance but they move a lot of water, and it seems that they use the waters in-compress-ability as a means to propel the boat as they move water through their blades, and push it against the water behind them. But heh. I know i've got a screw loose so i'm most likely wrong..
So the beam on the s-100 was 16.6 feet. There are three screws across that which combined cover between 75% to 80% of that breadth, so your correct. those screws were at least 4 feet wide and more likely 4.5 feet wide each.
now how much that block of brass weighs is another question. I would estimate around 450 pounds to 500 pounds each, based on that simple diameter and weight, the MOI comes out to being 71.0, unless I made some early morning before coffee mistake, which is quite possible.. that moi estimate is based on a roll coefficient of .238 with a diamets of 4.5 and a length of 4. somehow weight never seems to come into play when doing moi's for fsx.. I dont understand that. If I factor in the weight, that 71 all of a sudden turns into something more along the lines of 800, because the moi of a screw is going to be based more on weight and resistence with the resistence of the water at five feet depth being approx. 18 pounds per cubic inch and the 450 pounds of the prop all applying torque against the engine, (((627875.7764 ))) which could explain why we need 8000 cu inches of displacement to turn one screw.. Again, i'm probably wrong.. Theres nothing more dangerous than an idiot with a calculator, but hey, you may have saved me here.. Let me give that result a try..
