Adjusting the contrast for the Stadimeter

jazman · 03-15-08, 02:53 PM

Quote:

Originally Posted by Platapus

Rockin Robbins

I am not sure I understand your position on the stadimeter? You were a little vague in your posting. How do you really feel about it?

I looked up, and RR's colossal hate of the stadimeter blotted out the noonday sun.

I hate it, too.

Platapus · 03-15-08, 03:32 PM

First of all, I really like learning new tricks. And this one seems pretty handy. Unfortunately this old dog has problems learning new tricks.

In any class, there is always one that simply does not get it. That someone is me

So learn me a few things about this technique.

AoB - We are not worrying about calculating AoB as we are setting AoB to 90 and positioning the boat accordingly. Check, got that

Speed - Calculating that through radar/sonar/visual and manually entering that in the TDC. Check, got that

Range to target - Missing. This old dog is stubbing his paws on this one but we will bypass this for the moment. I trust that this technique does not require range

"We've gone to periscope depth. He's very close now, on bearing 324º. Here's the procedure. We can fire any time between bearing 345º and 15º. We'll do it pretty close to zero for best accuracy. With the target unlocked we'll sight ahead of the target by about 1/3 of its length and hit the bearing/range send button (make a note to have the TDC already set with that available ahead of time). Without touching the aiming of the periscope and with target still unlocked, we'll just send a couple of friendly fish his way as juicy parts of the target pass the crosshairs. Ready??"

Ready? nope. This is where you lost me. Talk me in for a landing here.

1. "We can fire any time between bearing 345º and 15º" Why? What tells me that I can fire anytime between these two bearings. Is is just an axiom of the technique or did I miss some calculation?

2. "We'll do it pretty close to zero for best accuracy." Why? Is this just for a minimum gyro angle or is there something more I am missin?

3. "we'll sight ahead of the target by about 1/3 of its length" Why? Why 1/3 and why are we sighting ahead of the target instead of locking on to the target and waiting for it to cross the 000 bearing? If I sight ahead of the ship won't my AoB be slightly off?

This old dog is sitting here scratching his ear with his foot a thinkin what about range to target? You mean to stand there with all your shiny braid and tell me that using this technique without changing anything it will work for a ship 600 yards away up to 1600 yards away?

Say it ain't so Joe, Say it ain't so!

Rockin Robbins · 03-15-08, 06:06 PM

I received a similar request from yours to cut the entertaining crap, fill in the blanks and actually teach them how to do it. Imagine that!

I've added a completly new section to the Dick O'Kane seminar to do exactly that. It has some updates suggested by aaronblood after he raked me over the coals (him too!) on the seminar.

Check out the new step-by-step after the end of the seminar and tell me if it's any clearer.

Now to answer your question (why would Rockin do a thing like that?????) Yes, this is nothing but a right triangle. As you scale it up and down the length of the torpedo run changes proportionally to the length of the target run and yes, Virginia, you get a boom no matter what the range is! The stadimeter is dead! Long live Dick O'Kane! Hold it. He's dead..... Well at least the stadimeter is dead, too!

Platapus · 03-15-08, 07:18 PM

Muchy thanks.
I printed this up and the next time I sees a floaty thing I will try.

Thanks for sharing and for putting together a nice explanation.

If anyone needs a proofreader for handy tips they need to write to the lowest denometer, call me

If I can understand it, it is well written

jazman · 03-15-08, 11:21 PM

Quote:

Originally Posted by Platapus

Muchy thanks.
I printed this up and the next time I sees a floaty thing I will try.

Thanks for sharing and for putting together a nice explanation.

If anyone needs a proofreader for handy tips they need to write to the lowest denometer, call me

If I can understand it, it is well written

I know it's hard to believe that range doesn't matter, but if you work out the trigonometry, it's true (and then you are a true believer). If the range increases, the distance the ship travels increases in the same proportion, and the distance the torpedo travels increases in the same proportion. Since they all increase in the same proportion, it's a wash. The key is 90-degree AoB.

Platapus · 03-16-08, 08:33 AM

Well my last Trig class was in 1976. I think I remember Trig having something to do with angles (or was that art class).. I forgets.

Back in my day we only had Right Triangles and only had one so we had to share!

I may have been obtuse in my Trig class but I did make notice of the proportions of this acute girl in my class. I tried bringing up an complementary angle to her but got no sin of encouragement.

We could not see eye to eye. She insisted that "pi r squared" and I insisted the Pies are round but Cornbread are square.

The relationship would not have worked. I should have paid more attention in class.

Probably would have sunked more floaty things

Sailor Steve · 03-16-08, 11:17 AM

Oh, man, that's awful!:p

Awful funny, that is!:rotfl:

Munchausen · 03-16-08, 12:03 PM

Quote:

Originally Posted by jazman

The key is 90-degree AoB.

Remembering that AoB is relative to the bow of your submarine. Not to the gyro (lead) angle of your fish.

Platapus · 03-16-08, 12:40 PM

It really should be written Angle of the Bow

So you telling me that my AoB is not just the reciprocal of my bearing?

<ducking and hiding>

I actually did that when I started in sub sims. I can't remember which one first introduced AoB but I quickly found out the error is my ways

Nisgeis · 03-17-08, 03:29 AM

Quote:

Originally Posted by Munchausen

Quote:

Originally Posted by jazman

The key is 90-degree AoB.

Remembering that AoB is relative to the bow of your submarine. Not to the gyro (lead) angle of your fish.

AoB is a bit of a tough one to get your head around. I struggled for a while with it, mainly due to all the examples having a ship sailing directly towards or away from you, so the AoB doesn't change. AoB is relative to the bow of your target. If you were standing on the target ship, looking dead ahead at the bow, then however many degrees you would have to turn left or right to see your submarine is the AoB.

The reciprocal of your own bearing is the bearing from the target to you.

If you were sat stationary, pointing north and your target were directly ahead of you on a relative bearing of 000 and sailing NE, then the AoB would be 135 degrees to starboard. If the ship were due west of you and was sailing south, the relative bearing would be 270 and the AoB would be 90 degrees to port.

If you have two of the three pieces of info, target true bearing, target AobB and target course then you can work out the missing one.

Munchausen · 03-17-08, 01:53 PM

Quote:

Originally Posted by Munchausen

Quote:

Originally Posted by jazman

The key is 90-degree AoB.

Remembering that AoB is relative to the bow of your submarine. Not to the gyro (lead) angle of your fish.

What I meant to say was, using the O'Kane attack method, your 90-degree AoB is relative to the bow of your sub. If you make an input to the TDC with your crosshairs offset from the sub's bow, make sure you also adjust AoB to compensate ... otherwise your 90-degree AoB will be relative to your offset bearing. And your attack geometry will be skewed.

03-15-08, 03:32 PM	#2
Platapus Fleet Admiral Join Date: Oct 2006 Posts: 19,381 Downloads: 63 Uploads: 0	Doin it Dicks way First of all, I really like learning new tricks. And this one seems pretty handy. Unfortunately this old dog has problems learning new tricks. In any class, there is always one that simply does not get it. That someone is me So learn me a few things about this technique. AoB - We are not worrying about calculating AoB as we are setting AoB to 90 and positioning the boat accordingly. Check, got that Speed - Calculating that through radar/sonar/visual and manually entering that in the TDC. Check, got that Range to target - Missing. This old dog is stubbing his paws on this one but we will bypass this for the moment. I trust that this technique does not require range "We've gone to periscope depth. He's very close now, on bearing 324º. Here's the procedure. We can fire any time between bearing 345º and 15º. We'll do it pretty close to zero for best accuracy. With the target unlocked we'll sight ahead of the target by about 1/3 of its length and hit the bearing/range send button (make a note to have the TDC already set with that available ahead of time). Without touching the aiming of the periscope and with target still unlocked, we'll just send a couple of friendly fish his way as juicy parts of the target pass the crosshairs. Ready??" Ready? nope. This is where you lost me. Talk me in for a landing here. 1. "We can fire any time between bearing 345º and 15º" Why? What tells me that I can fire anytime between these two bearings. Is is just an axiom of the technique or did I miss some calculation? 2. "We'll do it pretty close to zero for best accuracy." Why? Is this just for a minimum gyro angle or is there something more I am missin? 3. "we'll sight ahead of the target by about 1/3 of its length" Why? Why 1/3 and why are we sighting ahead of the target instead of locking on to the target and waiting for it to cross the 000 bearing? If I sight ahead of the ship won't my AoB be slightly off? This old dog is sitting here scratching his ear with his foot a thinkin what about range to target? You mean to stand there with all your shiny braid and tell me that using this technique without changing anything it will work for a ship 600 yards away up to 1600 yards away? Say it ain't so Joe, Say it ain't so! __________________ abusus non tollit usum - A right should NOT be withheld from people on the basis that some tend to abuse that right.

03-15-08, 06:06 PM	#3
Rockin Robbins Navy Seal Join Date: Mar 2007 Location: DeLand, FL Posts: 8,900 Downloads: 135 Uploads: 52	check again! I received a similar request from yours to cut the entertaining crap, fill in the blanks and actually teach them how to do it. Imagine that! I've added a completly new section to the Dick O'Kane seminar to do exactly that. It has some updates suggested by aaronblood after he raked me over the coals (him too!) on the seminar. Check out the new step-by-step after the end of the seminar and tell me if it's any clearer. Now to answer your question (why would Rockin do a thing like that?????) Yes, this is nothing but a right triangle. As you scale it up and down the length of the torpedo run changes proportionally to the length of the target run and yes, Virginia, you get a boom no matter what the range is! The stadimeter is dead! Long live Dick O'Kane! Hold it. He's dead..... Well at least the stadimeter is dead, too! __________________ Sub Skipper's Bag of Tricks, Slightly Subnuclear Mk 14 & Cutie, Slightly Subnuclear Deck Gun, EZPlot 2.0, TMOPlot, TMOKeys, SH4CMS

03-15-08, 07:18 PM	#4
Platapus Fleet Admiral Join Date: Oct 2006 Posts: 19,381 Downloads: 63 Uploads: 0	Muchy thanks. I printed this up and the next time I sees a floaty thing I will try. Thanks for sharing and for putting together a nice explanation. If anyone needs a proofreader for handy tips they need to write to the lowest denometer, call me If I can understand it, it is well written __________________ abusus non tollit usum - A right should NOT be withheld from people on the basis that some tend to abuse that right.

03-16-08, 08:33 AM	#6
Platapus Fleet Admiral Join Date: Oct 2006 Posts: 19,381 Downloads: 63 Uploads: 0	Well my last Trig class was in 1976. I think I remember Trig having something to do with angles (or was that art class).. I forgets. Back in my day we only had Right Triangles and only had one so we had to share! I may have been obtuse in my Trig class but I did make notice of the proportions of this acute girl in my class. I tried bringing up an complementary angle to her but got no sin of encouragement. We could not see eye to eye. She insisted that "pi r squared" and I insisted the Pies are round but Cornbread are square. The relationship would not have worked. I should have paid more attention in class. Probably would have sunked more floaty things __________________ abusus non tollit usum - A right should NOT be withheld from people on the basis that some tend to abuse that right.

03-16-08, 11:17 AM	#7
Sailor Steve Eternal Patrol Join Date: Nov 2002 Location: High in the mountains of Utah Posts: 50,369 Downloads: 745 Uploads: 249	Oh, man, that's awful!:p Awful funny, that is!:rotfl: __________________ “Never do anything you can't take back.” —Rocky Russo

03-16-08, 12:40 PM	#9
Platapus Fleet Admiral Join Date: Oct 2006 Posts: 19,381 Downloads: 63 Uploads: 0	It really should be written Angle of the Bow So you telling me that my AoB is not just the reciprocal of my bearing? <ducking and hiding> I actually did that when I started in sub sims. I can't remember which one first introduced AoB but I quickly found out the error is my ways __________________ abusus non tollit usum - A right should NOT be withheld from people on the basis that some tend to abuse that right.