Submarine Attack Course Finder (a.k.a. Is-Was / Banjo)

Able72 · 05-28-17, 06:05 PM

Sorry for the Thread Necro, but I was looking for the .pdf files to make on of these for myself and the links seem to be down. Does anyone have the files for this?

razark · 05-28-17, 08:43 PM

Quote:

Originally Posted by Able72

Sorry for the Thread Necro

Don't be sorry. This is a thread everyone should see.

Quote:

Originally Posted by Able72

Does anyone have the files for this?

You can find the files needed here, along with the manual for using it:
http://archive.hnsa.org/doc/attackfinder/index.htm

Note:
If you make one, consider adding an extra cursor to the is-was side. It comes in very useful.

Able72 · 05-28-17, 09:38 PM

Thank you.

Quote:

Originally Posted by razark

Don't be sorry. This is a thread everyone should see.
Note:
If you make one, consider adding an extra cursor to the is-was side. It comes in very useful.

Please explain what you mean? Why, how is this useful? Multiple targets?

razark · 05-29-17, 09:40 AM

It comes in useful if you're needing to keep a temporary result while doing your calculations. It also helps in lining up the inner time dial with the outer speed/range dial. There are also a couple methods you can use the wheel for that involve such things as comparing angles at different ranges. This becomes easier when you have the cursor to track and line up on one of the values, while you use the built in one for the other.

It's not strictly necessary, but it's so useful that I wonder why it wasn't built in.

saintkas · 06-25-17, 07:30 PM

As I looked through the description of how to assemble one of the Submarine Attack Course Finder devices from the SubSim site I noticed a variance between what was described for the homemade version versus what is described in the SACF Mk I Mod 3 Manual.

In the manual in the section titled “Description, Course Finder on page 3 it reads:
"A" - Azimuth circle (base disc) represents own ship, for reading relative bearing with periscope pointer.
"B" Compass rose (middle disc) for reading compass course of own and enemy ship.
"C" - Enemy Card (top disc) represents enemy ship, for reading relative bearing on enemy bow and track angle.
Periscope pointers (placed between "B" and "C") represents line of sight, for reading bearings and courses.

According to this, the “P” disc of the SACF is placed between the “B” ring and the “C” ring.

In the description of how to assemble the rings on the SubSim site it says to put the “P” ring on top.
The issue is that putting it on top creates the necessity of adding a handle to the “C” ring so that it can be easily rotated. If the “P” ring is placed beneath the “C” ring as is described in the manual, the handle on the “P” ring protrudes out beyond the “C” ring which eliminates the need for modification to the “C” ring.

If you look closely at the photograph of the front of the SACF you can just tell that the “P” ring is indeed underneath the “C” ring.

Just thought it might be helpful to point this out.

If there are enough people interested in having these made, there are several companies that make all sorts of circular decision and reference devices who could be engaged to make them for us.

Fair winds and following seas!

05-28-17, 06:05 PM	#1
Able72 Captain Join Date: Mar 2008 Location: Somewhere in the North Atlantic Posts: 343 Downloads: 299 Uploads: 0	Sorry for the Thread Necro, but I was looking for the .pdf files to make on of these for myself and the links seem to be down. Does anyone have the files for this? __________________ "Some ships are designed to sink, others require our assistance." Nathan Zelk

05-29-17, 09:40 AM	#4
razark Ocean Warrior Join Date: Mar 2007 Location: Houston, TX Posts: 2,731 Downloads: 393 Uploads: 12	It comes in useful if you're needing to keep a temporary result while doing your calculations. It also helps in lining up the inner time dial with the outer speed/range dial. There are also a couple methods you can use the wheel for that involve such things as comparing angles at different ranges. This becomes easier when you have the cursor to track and line up on one of the values, while you use the built in one for the other. It's not strictly necessary, but it's so useful that I wonder why it wasn't built in. __________________ "Never ask a World War II history buff for a 'final solution' to your problem!"

06-25-17, 07:30 PM	#5
saintkas Swabbie Join Date: Jun 2017 Location: Auburn, Maine Posts: 5 Downloads: 73 Uploads: 0	Construction detail correction As I looked through the description of how to assemble one of the Submarine Attack Course Finder devices from the SubSim site I noticed a variance between what was described for the homemade version versus what is described in the SACF Mk I Mod 3 Manual. In the manual in the section titled “Description, Course Finder on page 3 it reads: "A" - Azimuth circle (base disc) represents own ship, for reading relative bearing with periscope pointer. "B" Compass rose (middle disc) for reading compass course of own and enemy ship. "C" - Enemy Card (top disc) represents enemy ship, for reading relative bearing on enemy bow and track angle. Periscope pointers (placed between "B" and "C") represents line of sight, for reading bearings and courses. According to this, the “P” disc of the SACF is placed between the “B” ring and the “C” ring. In the description of how to assemble the rings on the SubSim site it says to put the “P” ring on top. The issue is that putting it on top creates the necessity of adding a handle to the “C” ring so that it can be easily rotated. If the “P” ring is placed beneath the “C” ring as is described in the manual, the handle on the “P” ring protrudes out beyond the “C” ring which eliminates the need for modification to the “C” ring. If you look closely at the photograph of the front of the SACF you can just tell that the “P” ring is indeed underneath the “C” ring. Just thought it might be helpful to point this out. If there are enough people interested in having these made, there are several companies that make all sorts of circular decision and reference devices who could be engaged to make them for us. Fair winds and following seas!