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vanjast · 12-22-09, 09:55 AM

I think I inadvertantly use DK's method without knowing it

.

My method of obtaining target speed is :
1) ship AOB + scope bearing = 90 :- adjust sub course so this is so.
2) pick a target at scope bearing of 60, 45, or 30.
3) adjust sub speed to either 1, 2 knots when submerged, higher speeds when on the surface.
4) without locking the scope monitor the ships relative bearing.
Simple mental trigonometry can be applied here to give you a ball park speed.

So we have speed, next is to setup the TDC so torps strike at about 5Degs.
Easy as pie, turn scope to bearing of 10-15 degrees off dead ahead and punch in the numbers - Wait for ship to cross-the-line.

12-22-09, 09:55 AM	#2
vanjast Sea Lord Join Date: Jun 2006 Location: Somewhere else now Posts: 1,740 Downloads: 825 Uploads: 4	I think I inadvertantly use DK's method without knowing it . My method of obtaining target speed is : 1) ship AOB + scope bearing = 90 :- adjust sub course so this is so. 2) pick a target at scope bearing of 60, 45, or 30. 3) adjust sub speed to either 1, 2 knots when submerged, higher speeds when on the surface. 4) without locking the scope monitor the ships relative bearing. Simple mental trigonometry can be applied here to give you a ball park speed. So we have speed, next is to setup the TDC so torps strike at about 5Degs. Easy as pie, turn scope to bearing of 10-15 degrees off dead ahead and punch in the numbers - Wait for ship to cross-the-line.