Description: Description: Description: Description: Description: Description: Description: Port Polar Bear

- Yamato -

 

IJN Yamato – Tyler (2021)

84.0 units, 24 seconds, Japanese Super Battleship launched 1940

 

The Yamato class battleships were the heaviest, widest, and most heavily armed battleship ever made. It was the only ship class to ever mount 18 inch guns. It was considered the pinnacle of achievement designed for ship to ship large gun combat. In reality however, due to fire control and other technological advantages, as well as numerical advantages of the American battleship fleet, the two Yamato Class ships and the several older modified battleships of the Japanese navy would have likely struggled significantly in this type of an engagement. Additionally, due to the dominance of air based combat in controlling naval engagements during WW2 which became the strategic centerpiece of the pacific war, supply and fuel limitations, and hesitation to commit the main Japanese battleship fleet, the “decisive battle” for which the ships were designed never happened and instead both the Yamto and Musashi were sunk by overwhelming air attacks.

 

Like most battlers, when I was first becoming interested in the hobby I wanted the biggest and baddest ship possible, so the Yamato was on my radar. Like most new battlers I had no idea what I would have actually been getting into at the time (tons of patching and limited fun due to inexperience and a huge ship) and luckily the veterans were able to talk me out of building a BFT (big floating target). However, after roughly 12 years in the hobby I believe that I have acquired sufficient battling and building experience to attempt this very advanced build. This ship should not be built by almost all battlers.

 

 

Even lying out the plans is intimidating. The ship is roughly 71.5 inches long and 10.6 inches wide.

 

 

I will try to document the baseboard technique I used for the ship which I used in combination with the upside-down build. Except for the far bow and stern I opted to only use the outer edge of the ribs as the center would be cut out any way, and it would save a ton of wood. Each of these ½ ribs were inset into the baseboard. 1/4 inch 5 ply birch plywood is used.

 

 

This picture shows the upside-down build technique used in the far bow and stern. The sub-deck is notched to accept the ribs which are not yet cut through the middle in this picture.

 

 

The ribs and sub deck sections are laid out. Due to stringers which hold the shape of the armor belt, the middle section of the ship gets 1/8 inch subdeck and far bow/stern get 1/4 inch sub deck.

 

 

Here is the baseboard for the middle section with accepting notches cut. The subdeck is next to it.

 

 

This is with the ribs glued in. It is in the process of getting things to line up correctly with the subdeck.

 

 

Here the 3 sections of the sub deck (bow and stern most 1/4 inch, middle section 1/8 inch) are glued together. The ribs are glued to the baseboard. I’m opting for 3 main deck sections and as such the cross braces will be between the turrets. Generally I like to have the middle section with superstructure be the main access point for routine changing of CO2 and batteries for most battle operations. If done correctly this makes stacking the ship on a boat rack without the middle superstructure much easier as well. The bow and stern deck pieces keep the turrets/guns in place for routine battle prep but are removed when necessary for maintenance.

 

 

The deck pieces are laid on top with the outer most edges cut off and glued to the sub deck. The far bow of the ship is not removable and with a ship so large will not really need to house any internal components. The far stern will need to be accessible to get to the rudder and as such I made a small 4th deck section where the step occurs. The stern most large deck section houses the stern most turret. There are slight overhanging sections of the ship which served as an aircraft deck. I built the overhanging section from ABS plastic rather than wood so it can take more of a beating and not chip away like wood might.

 

 

The bulge and stern/bow most water channeling is made from a big slug of balsa.

 

 

Balsa glued in and sanded smooth. The 1/4 inch subdeck is also sanded to follow the contour of the ribs. This angle looks awesome. The far bow and stern are done with multiple pieces of ¼ inch plywood rather than balsa as these areas are prone to getting shot to shreds and need the structural integrity that balsa doesn’t always offer.

 

 

Similar angle but from the side. You can appreciate the “swoop” in the deck that occurs near the bow turrets.

 

 

The stringers are made from 1/8 inch thick aluminum. It is very strong against bb fire but very workable especially when notched to fit into the ribs, but does take some patients when bending to get it in place.

 

 

The barbettes are amazingly huge. I actually had a hard time handling and cutting the huge ABS pipe evenly.

 

 

Close up of the deck planking. I love this effect. So pretty but fairly unrealistic, the boards would scale to 3 foot wide.

 

 

Overlayed the entire thing with 5oz cloth and west systems epoxy. I did 2 layers of fiberglass and sand/smooth re-finish with epoxy 4 total times (2 with the fiberglass and 2 as finishing).

 

 

Shafts going in. 2 inch props. Drag shafts not installed yet.

 

 

Epoxied everything to its final state, superstructure is a work in progress. I like circular inner barbette rings that are glued to the deck to hold the outer layer of ABS plastic pipe in place.

 

 

I took strips of 1/32 ply wood and laid out the aircraft rails, should give it a little texture.

 

 

Superstructure continues to come together. The two secondary turrets are in place.

 

 

Closer look at the ABS superstructure. I could add tiny bits endlessly. The secondaries are yet to be added.

 

 

More mid size secondary turrets added.

 

 

Internals layout starting to take shape. Radio box way in the bow with a mess of wires from there, this is borrowed from the Barham. 4 solenoids in the bow for those 4 guns. Then the batteries and bottles will sit in the middle section. Black pump mounts under the other cross brace. Motor mounts are to the sides of the stern most pump mount, the guns/solenoids will be right under the stern turret. The rudder torque requirements are anticipated to be massive, I will use 2 waterproof servos to push one gear. Internal armor is added.

 

 

The bow portion is seen, a keen eye will see that there are 2 separate air systems divided into 3 guns each (one goes to each of the left/right guns in each turret).

 

 

Its much bigger than the table.

 

 

Another profile shot.

 

 

Sides on and painted. The bow guns are loaded via the B turret. The other guns are loaded with the center superstructure piece removed. All magazines are straight.

 

 

Float tested after sheeting and painting. I didn’t have the main turrets yet. This is about 1 week before the first battle with her over Memorial Weened in 2021. At her first battle in MN she made it 2 battles but really only performed well for 1 of them. The solenoids were not able to reliably fire with the standard 6v main battery so I had to add a 9.6v separate battery after the battle to fire the solenoids which worked well. Overall I was very pleased with how nimble it is for such a massive ship. The damage control was also excellent, I took 190 above, 8on, and 74 below and didn’t really feel like it was anywhere near the edge.

 

 

Pictures of internals coming soon.

The ship runs on 60 amp-hours of 6volt NiMH. I use two 7 oz bottles with separate regulators which each feed one of the guns in each turret. The massive rudder is turned with 2 servos that work together.

 

 

 

Picture from Nats 2021. The guns were not quite high functioning at this point but the mobility and damage taking ability was very high. I won the Most Feared Axis award and was the highest damage with a sink/Swiss Cheese Award (214 above, 39 on, 67 below) and highest damage without a sink/Alien Award (181 above, 37 on, 43 below).

 

Port Polar Bear Home Page