Rowen's HMS Scimitar

          The C.S.S. Atlanta (pictured top right) was a Confederate States casement ironclad converted in early 1862 from the hull of a British steam blockade runner named Fingal.  The Atlanta was commissioned on November 22, 1862. Measuring 204’ long with a beam of 41’ and draft of 15’9”, she displaced 1006 tons and was manned by a crew of 145. She was armed with two 7” and two 6.4” Brooke rifled cannons.

          The U.S.S. Weehawken  (picture top left) was one of 10 Passiac Class second -generation monitors built in late 1862, after the world’s first monitor, the U.S.S. Monitor, was tested in battle against the C.S.S. Merrimac (Virginia) at Hampton Roads.
          She was built by Zeno Secor & Company, launched in November of 1862 at Jersey City, New Jersey and commissioned on January 18, 1863. Measuring 200’ long with a beam of 46’ and a draft of 10’6”, she displaced 1192 tons and was manned by a crew of 75. She was armed with one 15” and one 11” Dahlgren smooth bore cannon. 

          After the end of the war the Royal Navy decided to move from gasoline powered fast launches to diesel. This was to reduce fire risks. The first diesel powered boats were the Dark class introduced in the mid 1950s. They were powered by two Napier Deltic horizontally opposed, triangular layout two stroke diesels.  

          Shortly after this class was introduced it was determined the role of the Fast Patrol boat had been superseded by helicopters and shore based aircraft. The Fast Patrol vessels were then gradually withdrawn. To retain competence in the use of fast vessels though, the RN commissioned three fast training boats (FTBs), the Scimitar class. These were essentially twin-engined Vosper Brave class hulls with two Bristol Proteus Gas turbine engines.

​Rowen's Her Majesty's Air Force Vessel "Seal" - Parts 1 & 2.

RC NAVAL SHIPS

          Doug’s newest model is the Trumpeter 1:200 plastic kit of the battleship Bismarck. It is 49½” long and weighs approx. 20lbs in sailing condition.

            The kit had 1700 pieces, and in addition Doug had the extra kit of photo-etched details, which included railings, and radar displays on the bridge, amongst others. There was also a wooden deck consisting of printed wooden veneer on a self-adhesive backing made to fit onto the plastic deck.The model is intended for static display but Doug has done a few modifications to make it a sailing model. It is powered by three 280 size motors, with propellers mounted on extra-long shafts obtained from the Prop Shop in the UK. Speed control is through a single ESC by EA Electronics and power comes from a 6V 4.5Ah SLA battery. He’s using his new 10-channel FlySky radio. The main gun turrets can be individually rotated, each one having its own servo.

          
          The forward / aft trim looks OK, although I was surprised by the draft. The model weights about 6 lbs and is already close to the waterline. I added ballast weights to see what would be needed to bring the model down to waterline. This shows that rather less that 3 lbs was available for the deck, superstructure and detail. I'm going to have to watch my weight again!
          I decided to increase the top speed by overpowering the ESCs using a 4S battery. The ESCs must have a high voltage limiter as they cut out. From a box of bits I found a voltage reducer and installed it. Providing the voltage is adjusted to below about 14 volts, the ESCs operate fine. I settled on using 13.25 v to give a slight margin. The increase in voltage gave a marked increase in performance, and I decided to use this set-up permanently. I think the model is slightly overpowered, but at least it can be quickly moved out of conflict situations!  

Member's models - Frank's USS Crockett

Click on pictures to enlarge

           I would have liked to build a Scimitar Class FTB in around 1:32 scale, again using a glassfibre hull from MTB Hulls, but that scale was not in their range. They did offer a 1::72 scale hull that worked out around 16.5” long, but thought that would be too small for a working scale model. I was in touch with a modeller in Australia who has made similar models. He also pointed out the number of successful “plastic magic” conversions of kits that are around that size. Obviously, it is achievable. It would also give me a challenge as the larger scale would have been similar to my Brave Borderer and R.A.F. RTTL.
          The Scimitar FTB was similar to the Brave in many ways, both built by Vosper so the hull lineage is evident. Rather than three Proteus gas turbines it had only two. It was also unarmed and designed to give R.N. crews experience in fast, coastal patrol boats. The hull could also be armed and converted to the three Proteus turbines if circumstances changed.
          The biggest challenge will be to keep the weight down to around 450grams. I contacted MTBHulls; they offered to mould a lighter hull at around 100grams. I placed an order and it arrived promptly. It is lovely and light, but somewhat flexible. A thorough dimensional check also showed a slight twist in the forepart. I have found that a gentle application of heat, by heat gun, to glassfibre will allow it to be worked and adjusted. I warmed the hull and twisted it in the opposite direction to straighten it. This worked and the hull became true. I was concerned that the twist might reappear over the months before I can start the build, so I added a light bulkhead and bulwark stringers to hold in position. So far this has worked.

Steve’s Civil War monitors CSS Atlanta and USS Weehawken. 

           Frank's newest model is of the USS Crockett, an Asheville class gunboat which saw service in the Vietnam War. She was commissioned on 24th June 1967, transferred to reserve in July 1975 and decommissoned in 1976. She was 165 ft long, and 24' beam. Powered by two 725hp Cummins diesels and one 1370hp GE LM1500 gas turbine, she was capable of 50 knots. She was armed with one 3" and one 40mm guns, plus two twin 0.5" machine guns.
          The model is two Dumas kits, one comprising the parts to make the hull and superstructure, and the other the hardware and fittings. The model is 51" long, 5/16" to 1ft scale, or 1:39. This makes the scale speed for the model, corresponding to 50 knots, to be 11.5 km/hr. 
          Frank found this to be a learning  experience for him and he now has a greater appreciation and understanding of the skills required to build a boat of this size and detail. The instructions were very poor, consisting entirely of text with no diagrams or illustrations to help. Youtube and Bill M were able to provide more help. Frank built the hull and applied the fibreglass and Bill M. helped him with the finishing of the hull. The hull was too flexible with the 1/8 " thick ribs supplied and these were replaced with 1/4" ribs. The main deck was supplied as two halves in the same sheet of wood, so these were replaced with a single piece. The bridge front was too thin and flimsy and all of the bridge structure parts were replaced. The guns were poorly designed, so redesigned by Bill and built in a completely different way.  In addition, the railings were made from stainless  because the material provided in the kit was not strong enough.  On  the whole the kit was poorly designed and without Bill's help and guidance it would still be sitting on the work table. 
           The model is powered by two 12 motors from a 2.9 Ah gell cell battery, using a Viper speed control and an Attack 75MHz radio. The lights are powered from a AA battery pack.

          Dean found his model kit while browsing in a model store and was immediately attracted to it, especially since he had a couple of friends who had served in them.
       

Member's models - Flower class corvettes by Paul and Dean.

Click on pictures to enlarge

          After the shafts were correctly located, the motor mount position was established. I made up a mount using wood and aluminium plate. The motor shaft spacing is determined using the shaft centre lines. The longitudinal location can be measured from the shaft slope and height.
          Two brushed, 550 type motors were then fitted to the mount, followed by the shaft couplings. The mount location can be fine tuned by slightly sliding the mount around until the motor and shafts could be rotated with the minimum force. The mount was then glued into place.
          The shaft couplings used are steel, which tend to be noisy. I find that if a rubber or plastic sleeve is pushed over the coupling it quietens considerably. The inner coupling cavity/sleeve can also be filled with grease to ensure the joint is lubricated. I had earlier installed “oiler” fittings to the shafts for periodic lubrication.
          I decided to try the Quicrun 1060 series ESC on this model, one per motor, to improve control. So far they work well, although the installation would be eased if the wires were longer.
          I made up rudders by wrapping styrene sheet around a flattened brass rod and gluing together. The doubled over sheet was then cut to the rudder side profile and the section sanded to shape. Once compete the shafts were lubricated and inserted into the tubes. The rudder servo was fitted with a control linkage made up using old bicycle spokes and tested. I set the radio up to the “elevon” control sequence and tested the systems. Nice thing about brushed motors is everything usually works right the first time! No programming of ESCs etc needed either!

​The hull was now watertight with the powertrain fitted; time for trial tests on the local pool. This may appear awry chronologically as I wanted to get the hull sailing properly before adding the superstructure etc as a winter project. I am using 3 S Li-Po batteries and I found the performance adequate. Nice bow and wave patterns, similar to the actual vessel photographs.

         To have two club members find out by chance that they are building the same model kit and then work to complete them at the same time, must be unusual. That was the case for Paul and Dean building their models of a Flower-class corvette. The ships were known as such because those built for the Royal Navy were named after flowers. The Royal Canadian Navy chose to name them after Canadian towns.

​

         Paul built his model of the HMCS La Malbaie as a tribute to his father-in-law, Lieutenant-Commander Charles Edmonds (Chuck), who served on her from 1941 until 1944 out of Halifax and St. John’s.        

Doug's battleship Bismarck