intercept target solutions ? geometrical method ?

[Pisces]

Originally Posted by sENoZ

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But, how do you figure out how much you want to lead the target by? The posts I've seen usually give simple rules of thumb, like "10 degrees for a slow target, 20 degrees for a fast one", or "about 1/3 of the target's length", but I'm anal and like to know exactly.

The lead angle is a function of two things: the speed of the target (Vtarget), and the speed of the torpedo (Vtorp), and it's simply equal to atan(Vtarget, Vtorp). for example it will show you that if the target is going 10 knots, and your torpedoes go 36 knots, the optimal lead angle is 16 degrees:




now ... you should understand better then i tryed to explain you ^^

Ok, I understand now that your rule is not to be taken literally in a mathematical sense. With the + you mean both target speed and torpedo speed needs to be taken into account. The + does not mean adding in a numerical sense. But without further explanation in message # 7 this is how everyone interprets this. Be careful of this.

Ok, so then you have a method to calculate shooting angle from target speed (and torpedo speed). I understand that you are using this table attached in message #22. That is great. That was the unanswered question. Problem solved.

How I calculate shooting angle (lead angle)? Basically using the same formula. (mathematical Sine law: sin(lead angle)*torpedo speed=target speed* sin(AOB) ; or lead angle = asin (target speed*sin( AOB)/torpedo speed) )


Mostly I use the TDC as it is supposed to be used to make it steer the torpedo gyro angle by itself, but manually setting the dials. Not using the notepad method in any way. Sometimes I use a handheld calculator to calculate the above formula to check the leadangle, but if I am feeling nostalgic I calculate it with a handheld slideruler. The really old fashioned way. (And mess it up 9 times out of 10! )

The 'normal' german TDC procedure:
Set the periscope to 0,
Flip the TDC update switch, (I think it is that red button in between the TDC dials, but I am not sure with your GUI mod)
Set AOB to 90 (or whatever angle I am crossing the target path),
Set the target speed to the right value,
Set range as needed if I don't shoot straight ahead,
Flip the TDC update switch back,
point the periscope wherever I want,
the gyro angle follows correctly wherever I point the periscope.