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Originally Posted by vanjast
I've changed the whole concept, and am looking at a wheel.
I agree with the other methods, but they require you to keep your scope up for too long, to make a measurement.
What I want to do, is pop the scope up, make a quick bow measurement, down scope and work out all the TDC stuff, punch this into the TDC and then setup the shot. It requires a bit of homework for one person, but they had about 3 or more people doing this.
Another thing, is that if target courses and speed change at the last minute, one doesn't have the time to do 'longtime' measurements.
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Ok, sliderule wheel is a perfect solution to the calculation.
But, you don't have to watch al the time. Just the time it starts to touch the line and when it's passed. You could take a peek every now an then to see how far it got (to finally pop up at the right tiime). Also, you can do it at long range. But still, what do you consider long? As an example from Sh3 (as I don't know how long the average pacific merchant is): 140m long ship (which would be 460ft or 155yds) at 7 knots takes 39 seconds to cross. If that Iowa is 270m long, at 10knots its taking 52.5 seconds.
If the target's course and speed change you've made a bad move anyhow, since you are likely detected. If not, it's a regular course change and you've got time enough to track and kill it until the next course change. But hey, if you feel like making it complicated, be my guest.
