Expermiting with Scope SH4

[Captain_AJ]

In sh4 no matter the angle you can hit your target from 270, 180, 90, 0, using the bow tubes. the solution for firing of fish at 270 for example optimal track is to have the target ship at 6 knots and AOB from 90-98 when shooting from the bow tubes and your boat is heading east , you will need to aligin the scope at 270 and set your paramitters .. AOB at 98 , speed at 6knts , the range at 1300 -- you will than align your scope at 260. your torpedo settings , will be contact and speed set at high . you can only allow the Sub speed at 1 knt , once the bow of the ship hits the 260 mark fire at points as the ship passes , the bow , amidships , stern .. this also can be used for the stern tubes ,, I have found out that a 10 degree lead will hit the ship at the 0 spot from were you have aimed , reading Old Is US Navy manuels and practising formulas I have found this works effectivly . Using Manuel targeting is so much more fun .. Since the scope in Sh4 different than SH5 . I had to figure out a way to measure the ships speed using the scope ... Look at fig 1 below.
fig 1

I found out using sh4 scope that if you count the gradients from the stern of the ship to bow of the ship by 5 (scope has to be in the close up view )

you count the stern from the centerline of the scope to the lenght of the ship , multply that by how many marks .. thus if you see 7 mark's, 7 x 5 = 45, 45 x2 = 90 ft you than take the bow of the ship and start your clock and count how many seconds it takes for the centerline to reach the stern. if it took 45 secs than muliply .45x 90 = 40.5 divide that by 3 than you will get your speed 13.5 knts , take this and divide that by 2 and you will get your true speed of 6.75 knts

So far this has been working .. Any suggestions of caculating legnth and speed withSH4 besides the plotting map method would help .. Thanks , happy hunting

[Rockin Robbins]

Originally Posted by kimuraijn

In sh4 no matter the angle you can hit your target from 270, 180, 90, 0, using the bow tubes. the solution for firing of fish at 270 for example optimal track is to have the target ship at 6 knots and AOB from 90-98 when shooting from the bow tubes and your boat is heading east , you will need to aligin the scope at 270 and set your paramitters .. AOB at 98 , speed at 6knts , the range at 1300 -- you will than align your scope at 260. your torpedo settings , will be contact and speed set at high . you can only allow the Sub speed at 1 knt , once the bow of the ship hits the 260 mark fire at points as the ship passes , the bow , amidships , stern .. this also can be used for the stern tubes ,, I have found out that a 10 degree lead will hit the ship at the 0 spot from were you have aimed , reading Old Is US Navy manuels and practising formulas I have found this works effectivly . Using Manuel targeting is so much more fun .. Since the scope in Sh4 different than SH5 . I had to figure out a way to measure the ships speed using the scope ... Look at fig 1 below.
fig 1

I found out using sh4 scope that if you count the gradients from the stern of the ship to bow of the ship by 5 (scope has to be in the close up view )

you count the stern from the centerline of the scope to the lenght of the ship , multply that by how many marks .. thus if you see 7 mark's, 7 x 5 = 45, 45 x2 = 90 ft you than take the bow of the ship and start your clock and count how many seconds it takes for the centerline to reach the stern. if it took 45 secs than muliply .45x 90 = 40.5 divide that by 3 than you will get your speed 13.5 knts , take this and divide that by 2 and you will get your true speed of 6.75 knts

So far this has been working .. Any suggestions of caculating legnth and speed withSH4 besides the plotting map method would help .. Thanks , happy hunting

Looks elegant but 7x5=35 not 45 so your solution depends on you making an error in calculation. I would suggest this is not a method that works because errors are random. Why do you arbitrarily change a unit of time, 45 seconds, into a fractional parameter, .45, for your calculation? You don't establish any logic to the method. And why divide by 3? Why then divide again by 2? And why not just divide by 6? And where does the 6 come from and why is it used?

I don't see math, I see black magic. I don't see method, I see superstition. Personally I use my shoe size.

How about deriving your numbers and explaining why your method works? Start with how your speed has anything to do with the length of the ship you are measuring with your telemeter marks. Then I'll bring in CapnScurvy to explain how and why you can't use the telemeter marks in stock SH4.

[yubba]

A mod wish,, a way to adjust range, angle on bow and speed,, in the attack map screen ,, I've gotten the input into the torpedo solution close with about 4 trips back en forth to the periscope to get where I can fire.. or is that to much of a cheat

[Rockin Robbins]

Adjusting parameters on the attack map screen is a kludge from SH3. It isn't realistic there either. The attack map simulates the check that was made between actual target position and the position in the TDC, which was made before every shot. If they were not in agreement the sub didn't shoot.

But the man responsible for that check did not set AoB, target speed, range or bearing into the TDC. He was the independent observer that kept the TDC team honest. This was true on US and German boats.

I have no idea where the SH3 kludge came from. But it's wrong. We shouldn't imitate it in SH4.

[gumbeauregard]

You can estimate speed if you know the range by measuring the time to traverse 10 degrees (or any other number of degrees).

However, this method requires some trigonometry so a prepared table of values is the best way to employ this method.

[Rockin Robbins]

Originally Posted by gumbeauregard

You can estimate speed if you know the range by measuring the time to traverse 10 degrees (or any other number of degrees).

However, this method requires some trigonometry so a prepared table of values is the best way to employ this method.

Good luck with that....