CDR_Ret

Actually, there's another ship modeling forum on the internet that's infamous for ignoring intellectual property rights. Let's not go there. Keep it real.  

Rock-Away fighting chair.
Whilst scratching my head about the barrel build, thought I'd have a bash at the chair. It's a tricky little job; at 1:20 it's about 2 1/2" (65mm) high.
Pity Quint didn't sit on a box like other anglers...
 

 

 

 

 

 
Getting there...
 

 

 

 
Still have some tapered machined rod holders either side to do..  but that will do for now.

RADARS
 
The ship carried a collection of radars. I have data sheets and drawings for most of them, and the service manual for the AN/SPS-10. Each antenna was a model unto itself.
 
AN/SPS-10 Surface Search Radar
 

 
The SPS-10 was the primary surface search radar, used to detect ships and low flying aircraft and missiles. On the OK City the horizon was about 13 miles at the height of the SPS-10 antenna. The radar could track targets above the horizon out to about 100 miles. It was very sensitive when tuned properly. On one occasion we tracked flocks of birds a mile or two away. On another occasion when we had excellent atmospheric "tunneling" over the horizon I tracked an aircraft carrier at Yankee Station in the Gulf of Tonkin at a distance of 65 miles. The SPS-10 operated at 5.42 to 5.825 GHz with a 285 kW peak power.
 
The antenna carried a AN/UPX-27 Identification Friend or Foe (IFF) dipole on the "spider" arm that held the feed horn. This is the rod with the square kink in it, and the surrounding reflector rods. 
 
 
Pathfinder Navigation Radar

 
 
 
We had a Raytheon Pathfinder radar for navigation in harbors and channels. The SPS-10 had a minimum range of about a mile or so, and couldn't detect close in objects. The Pathfinder was good down to very short distances.
 
This is a very sketchy illustration. I have no data sheets or drawings and only a few fuzzy photos to work from. Some day I will have better information and will be able to make a more accurate model.
 
 
 
 
AN/SPS-43 Air Search Radar
 
The SPS-43 was the primary air search radar. It had an effective range out to 300 miles for high flying planes and missiles. The minimum range for low flying planes was limited by the horizon. In Vietnam I used the 43 to track B-52 flights from Thailand to targets in North Vietnam. The huge slab sides of the B-52 were "anti-stealth" - they showed up as large bright blips on the radar screen. They were called "Arc Light" missions for good reason!


The "bed spring" reflector had a "W" shape cross section behind an array of  ten pairs of dipole antennas fed by a complex coaxial transmission line system with power dividers to feed each pair of dipoles the same amount of radiated power. The SPS-43 operated in the VHF band at 200 MHz with 180 kW peak output.
 
I finally found a few high resolution photos to allow me to work out the details of the antenna and support pedestal.
 
The short rectangular antenna at the top is an AT-352/UPA-22 IFF Interrogator antenna.
 
 
 
 
AN/SPS-30 3D Height Finder Radar
 
The SPS-30 was an air search radar that had altitude detection capabilities. Altitude information from the 30 was fed into the missile guidance computers for intercept calculations. The SPS-30 also served as a secondary air search radar. An AS-791/UPA-43 IFF Interrogator antenna located on the aft radar tower platform was slaved to the SPS-30.


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The SPS-30 had a large oval parabolic dish reflector. In front of the reflector, at the end of the long support arm, was an "organ pipe" scanner. A waveguide connection in the scanner rotating at 240 to 2400 RPM fed the RF energy into twenty parallel vertically stacked waveguides leading to the feedhorns. Each feedhorn radiated RF energy at a slightly different angle to the reflector, resulting in 20 different beams reflected at different elevations. Returning signals from a target reflected off the dish into the respective feed horn, allowing the system to determine the vertical angle from the antenna to the target. From this angle and the range to the target the elevation was calculated.
 
The antenna could be rotated for air search operation or it could be aimed to track a single target. The entire rotating antenna dish and support arm could be elevated to track targets through a wide range of elevations. The mechanisms of the antenna were supported on a pedestal that had a gimbal system to compensate for roll and pitch of the ship to keep the antenna aimed at the target being tracked. Dual electric motors positioned the antenna for roll and pitch compensation. The SPS-30 operated in the S band from 3.4 to 3.6 GHz with a peak output power of 2.5 megawatts. It had an effective range of 240 miles.
 
AN/SPG-49 Missile Tracking Radar
 
The ship carried two SPG-49 tracking radars. The SPG-49 was a 19 feet high, 17 feet wide, 22 ton monster. The 49s had C band monopulse tracking radars and continuous wave (CW) illumination radars combined into the one antenna. The system performed three functions. During target acquisition the antenna radiated 3 megawatt pulsed bearing and azimuth sweeps to determine range, bearing and altitude of a target. After the target had been acquired the antenna switched to a pulsed 3 megawatt narrow beam tracking radar. When a missile closed range to a target the antenna also radiated a 5 kilowatt CW illumination beam that carried target identification information for the missile to home on.  All of the transmitters and receivers were housed inside the antenna shell.

 
The mechanism consisted of four assemblies. The truncated cone base was mounted on the ship with an accuracy of +/- 0.035 inch vertical relative to the axis of the missile launching system. The base contained a hydraulic drive to rotate the "U" shaped yoke around the vertical axis on the base. The yoke carried dual electric motors to drive the gimbal that rotated around the horizontal axis. The antenna housing rotated around the vertical relative to the gimbal by two sets of dual electric drive motors. A coarse bearing was maintained by the rotation of the yoke, but the motors on the gimbal allowed the antenna housing to be rotated side to side quickly and with better precision.
 

 
 
 
The antenna carried a closed circuit television camera that was used for antenna alignment. It could also be used to track short range targets visually. The Talos missile had a range of 130 nmi and the SPG-49 had a maximum range of 150 nmi. Tracking information from the 49s fed the missile guidance computer for calculation of the intercept position. For more details of the SPG-49 construction and operation use this link: https://www.okieboat.com/SPG-49 description.html
 
AN/SPW-2 Missile Guidance Radar
 
The ship carried two SPW-2 "radars." The SPW-2 wasn't exactly a radar. It transmitted a narrow guidance beam that the beam riding Talos missile followed. The missile guidance computer calculated an intercept point ahead of the target position and used the SPW-2 to drive the missile to the intercept point. The missile transmitted position and identification signals that the SPW-2 received. The received signals from the missile fed the guidance computer to track the missile.

 
The SPW-2 had a small optical telescope that was used for alignment. It also had a platform on top that could carry a closed circuit television camera, but we didn't have the TV cameras on the SPW-2s while I was aboard. The television camera could be used for alignment and to visually track the missile in flight at close range.
 
Mk 25 Gun Fire Control Radar
 
The Mk 25 electronics were housed in the Mk 37 gun director, with the antenna on top. It was used to determine bearing, elevation and range to targets that were engaged with gunfire. For direct fire missions with visible targets it tracked the target. For indirect fire missions with targets hidden behind hills it tracked a known point on land for reference in calculating the range and bearing to the target.

The Mk 25 operated from 5.2 to 10.9 GHz with a peak power output of 50 KW. It could track targets out to 50 nmi.
 
Phil
 
 

MIDSHIPS RADAR TOWER
 
This tower originally carried a radar antenna, but it was removed to reduce topside weight. The basic structure was similar to the forward radar tower.
 


 
The tower rested upon the top of the O3 level radar room. Well, it was a radar room while the 3D radar antenna was on the tower, but after the antenna and associated radar equipment were removed the compartment became an office with very good heating and air conditioning. The large vent stack on the starboard side of the compartment was Charlie Noble. The arms extending from the deck house sides were the rests for the stowed boat booms.
 

 
The platform at the top of the tower carried four 35 foot whip antennas and a few other smaller antennas. A short stub mast carried the ship's Tactical Air Navigation (TACAN) antenna in the dome. It was used by helicopters to determine the range and bearing to the ship. It was also used by other ships to facilitate rendezvous. Another mast at the forward edge of the platform carried a few more antennas and the ship's AN/URD-4 radio direction finder at the top that was used for search and rescue operations. This mast was hinged about half way up so it could be folded sideways. There were a few bridges the ship might have to pass under that were lower than the raised mast.
 
Phil

I need longer fingernails...

Roger, the CO of my first submarine described the nuclear propulsion plant as "just a sophisticated way of boiling water." 🙄

Roger, the CO of my first submarine described the nuclear propulsion plant as "just a sophisticated way of boiling water." 🙄

Nuclear submarines are steamboats (with a low carbon footprint) after all

Roger, the CO of my first submarine described the nuclear propulsion plant as "just a sophisticated way of boiling water." 🙄

Roger, the CO of my first submarine described the nuclear propulsion plant as "just a sophisticated way of boiling water." 🙄

Roger, the CO of my first submarine described the nuclear propulsion plant as "just a sophisticated way of boiling water." 🙄

Roger, the CO of my first submarine described the nuclear propulsion plant as "just a sophisticated way of boiling water." 🙄

Roger,
 
Quite the career you had there. Thank you for sharing and thank you for your service in the Navy. I am prior Air Force, but for some odd reason I have always had more interest in ships than planes. Never been able to figure that one out. 🤷‍♂️

-Brian
 

Brian,
 
No I was not a pipefitter, but like you I have great respect for their abilities. IMHO, they are the aristocrats of the building trades.  Few people probably realize that they are graduates of a demanding four year work study apprentice program.  Much of what they do requires an advanced knowledge of trigonometry.
 
I came into the piping industry via the back door.  I am an engineer with a degree in Naval Architecture and Marine Engineering, and a commission as an Ensign in the naval reserve.  Upon graduation I was ordered by the Navy to report to Admiral Rickover’s Nuclear Engineering organization where for the next four years I worked on nuclear submarine piping systems.
 
When I left the Navy, I was hired by a large engineering company, that was building piping systems for civilian nuclear power plants, as their quality assurance manager.  I went on to other engineering and management roles, all involving high pressure piping.  It is a small but fascinating industry with its own technology.
 
Roger

We are all hazarding a guess!

Mustafa,
 
Thinking that you might not be able to run DELFTship, I created the nine stations you would need to hand draft the plywood planks in my 2D program. This is what I came up with:
 

A couple of issues are evident. The main problem is that the body plan is not consistent with the profile and plan views. So you will be able to use that view only for general reference. I think you can get all the important details from the other views. Also, the image is slightly tilted (less than half a degree), but that can be enough to throw off some dimensions. I corrected the tilt in this image.
 
Even with a lower-resolution background image, you should be able to adjust the the chines to create fair edges for your plywood planks. If you view the surfaces using the Developable tool——you should be able to adjust the crease edges to create a completely fair surface.
What you are looking for is a solid green color indicating the surface curves in only one direction or is perfectly flat. This means you can cut the plank out of a flat piece of plywood stock. Usually the program will show red shading near the edges, especially if the edges themselves curve in more than one direction. This is how my brigantine's cylindrical transom looks because of this effect:
 
 
As far as sizing the background images and other considerations for starting a DELFTship project, see my tutorial available at this page here in this forum.
 
Again, contact me if you need some assistance getting started.
 
Cheers!
 
Terry

Mustafa,
 
Thinking that you might not be able to run DELFTship, I created the nine stations you would need to hand draft the plywood planks in my 2D program. This is what I came up with:
 

A couple of issues are evident. The main problem is that the body plan is not consistent with the profile and plan views. So you will be able to use that view only for general reference. I think you can get all the important details from the other views. Also, the image is slightly tilted (less than half a degree), but that can be enough to throw off some dimensions. I corrected the tilt in this image.
 
Even with a lower-resolution background image, you should be able to adjust the the chines to create fair edges for your plywood planks. If you view the surfaces using the Developable tool——you should be able to adjust the crease edges to create a completely fair surface.
What you are looking for is a solid green color indicating the surface curves in only one direction or is perfectly flat. This means you can cut the plank out of a flat piece of plywood stock. Usually the program will show red shading near the edges, especially if the edges themselves curve in more than one direction. This is how my brigantine's cylindrical transom looks because of this effect:
 
 
As far as sizing the background images and other considerations for starting a DELFTship project, see my tutorial available at this page here in this forum.
 
Again, contact me if you need some assistance getting started.
 
Cheers!
 
Terry

Late 2012 Mac running Mojave 10.14.6
 
Using Wine/Winebottler I have Delftship v5 working, but can't get v10 or 13 to work.
v5 is 32bit as is Freeship v3.4 which I also have working.
The new Delftship v13 is 64bit, as is Freeship V5 which I can't get working either.
There are problems getting some 64bit programs to work as Wine is a 32 bit program. There is no 64bit Wine version for Mac, so it will only work properly in Mjoave (10.14) or lower, as Catalina is pure 64bit and won't even run OSX 32bit apps.
Also it appears OSX deprecated OpenGL3 in Mojave and above for Metal.
If you want to try either on a Mac you really need an older 32bit version.
 
It looks like either dual booting or a virtual Windows environment (Virtualbox, Crossover - who say they've got it running, Parallels) is the only viable solution for some programs.
 
Hope this helps a little.
Bob
 
A small update.  Using Virtualbox and Win7 64bit installing delftship 1330_334 on a Mac Mojave 14.6 it won't run.  However, putting the file opengl32.dll into the same directory as delftship.exe it starts and runs. Tweaking the Vm settings for RAM and Video RAM will get it to work at least usable.

Mustafa,
 
Thinking that you might not be able to run DELFTship, I created the nine stations you would need to hand draft the plywood planks in my 2D program. This is what I came up with:
 

A couple of issues are evident. The main problem is that the body plan is not consistent with the profile and plan views. So you will be able to use that view only for general reference. I think you can get all the important details from the other views. Also, the image is slightly tilted (less than half a degree), but that can be enough to throw off some dimensions. I corrected the tilt in this image.
 
Even with a lower-resolution background image, you should be able to adjust the the chines to create fair edges for your plywood planks. If you view the surfaces using the Developable tool——you should be able to adjust the crease edges to create a completely fair surface.
What you are looking for is a solid green color indicating the surface curves in only one direction or is perfectly flat. This means you can cut the plank out of a flat piece of plywood stock. Usually the program will show red shading near the edges, especially if the edges themselves curve in more than one direction. This is how my brigantine's cylindrical transom looks because of this effect:
 
 
As far as sizing the background images and other considerations for starting a DELFTship project, see my tutorial available at this page here in this forum.
 
Again, contact me if you need some assistance getting started.
 
Cheers!
 
Terry

Mustafa,
 
I think DELFTship is a Windows-only platform, sadly.
 
But like Roger said, you can create stations along the length of the hull in both profile and top views. Then pick off heights and breadths of the "chine" lines at each station and plot them in the body plan view. When you connect the dots with with straight lines at each station, you have your third view.
 
The harder part will be generating the true shapes of the plywood planks. I think this can be done by drawing diagonals in the body plan view for each plank, then picking off the distances from the associated diagonal of the top and bottom edges (chines) at each station. This sounds more complicated than it actually is. [Edit: If there is a twist to the plank, I'm not sure this will actually work.]
 
Terry

Hello Mustafa,
 
I think it may be doable. The interrupted lines in the plan and profile views represent edges of developable sheets of plywood. The body plan view can provide the true widths of the sheets at the dead flat point. So your software should be able to create the necessary pieces in 3D.
 
Does your software "unwrap" surfaces to create the plywood templates? If not, I recommend DELFTship Free. This program also allows you to create truly developable parts using visual cues such as solid colors.
 
Let me know if I can be of further help.
 
Terry

Mustafa,
 
Thinking that you might not be able to run DELFTship, I created the nine stations you would need to hand draft the plywood planks in my 2D program. This is what I came up with:
 

A couple of issues are evident. The main problem is that the body plan is not consistent with the profile and plan views. So you will be able to use that view only for general reference. I think you can get all the important details from the other views. Also, the image is slightly tilted (less than half a degree), but that can be enough to throw off some dimensions. I corrected the tilt in this image.
 
Even with a lower-resolution background image, you should be able to adjust the the chines to create fair edges for your plywood planks. If you view the surfaces using the Developable tool——you should be able to adjust the crease edges to create a completely fair surface.
What you are looking for is a solid green color indicating the surface curves in only one direction or is perfectly flat. This means you can cut the plank out of a flat piece of plywood stock. Usually the program will show red shading near the edges, especially if the edges themselves curve in more than one direction. This is how my brigantine's cylindrical transom looks because of this effect:
 
 
As far as sizing the background images and other considerations for starting a DELFTship project, see my tutorial available at this page here in this forum.
 
Again, contact me if you need some assistance getting started.
 
Cheers!
 
Terry

Mustafa,
 
I think DELFTship is a Windows-only platform, sadly.
 
But like Roger said, you can create stations along the length of the hull in both profile and top views. Then pick off heights and breadths of the "chine" lines at each station and plot them in the body plan view. When you connect the dots with with straight lines at each station, you have your third view.
 
The harder part will be generating the true shapes of the plywood planks. I think this can be done by drawing diagonals in the body plan view for each plank, then picking off the distances from the associated diagonal of the top and bottom edges (chines) at each station. This sounds more complicated than it actually is. [Edit: If there is a twist to the plank, I'm not sure this will actually work.]
 
Terry

Hello Mustafa,
 
I think it may be doable. The interrupted lines in the plan and profile views represent edges of developable sheets of plywood. The body plan view can provide the true widths of the sheets at the dead flat point. So your software should be able to create the necessary pieces in 3D.
 
Does your software "unwrap" surfaces to create the plywood templates? If not, I recommend DELFTship Free. This program also allows you to create truly developable parts using visual cues such as solid colors.
 
Let me know if I can be of further help.
 
Terry

This would not be hard to do as this is a “hard chine” boat.  The dotted lines represent the chines in each view.  For each section simply measure distances from the centerline in the plan view and above and below from the waterline, plot, and connect the points with straight lines.  No CADD program is needed.
 
Roger