Elco 80′ Patrol Torpedo Boat

An important weapon that is the very definition of a low value asset, the PT boat manages to be one of the better known weapons of the Second World War.

Let’s take a look at, what will probably be, the only true naval combatant that will ever appear at this site.

Most navies in World War II had some sort of small, fast torpedo boat. Going back to the 1870s such vessels were appearing in the World’s steam-powered steel navies. Every major Navy responded with some sort of high speed escort for their heavy ships, commonly known as Torpedo Boat Destroyers. It soon became clear that these escorts were actually better torpedo platforms than the smaller torpedo boats, and when they were equipped with torpedoes themselves they became broadly known as “Destroyers”. During World War I Destroyers added anti-submarine and anti-aircraft roles to their duties. By World War II the Destroyer was THE indispensable all-purpose escort.
But with the increase in roles came an increase in size and cost. It could take years to design, build and train a destroyer force. In the mid-1930s the Royal Navy started to take seriously the idea of a small, fast torpedo boat that could be built quickly and en masse. Such boats were classified as MTBs, or “Motor, Torpedo Boats” (like there could ever be any confusion that a 40+ knot boat didn’t have a motor).

Bow weapons. The forward gun is a 37 mm auto cannon from a P-39. On boats built prior to 1945 that was literally from a damaged P-39. It provided some armor piercing capability against enemy gunboats or even shore-line bunkers. The 20 mm cannon just behind was initially provided for some anti-aircraft firepower, but obviously had utility against a range of targets. Both weapons have ammunition lockers right behind them. The rocket launchers are shown swung out for firing, they can rotate back over the deck for reloading.
Midship we see the torpedoes most prominent. By 1944 the Mark 14 torpedo had become a capable enough weapon, but PT Boats were not great platforms for them. They saw some success against coastal shipping, but PT Boats only rarely encountered worthy targets. Some even deleted the torpedoes and became pure gunboats. The twin .50 machine guns are up in the superstructure, surrounded by rings to restrict them from firing into their own boat.
The exhaust is interesting, these boats most often exhaust straight back; but they also have a sort of “silent running” mode. The exhaust can be routed through the large mufflers that let out into the water. I would think this would be like blowing on a straw in your soda! But apparently it worked well enough attenuate a lot of engine noise.

The US Navy took notice and took interest in 1937 and by 1940 had eight prototypes (appropriately PT 1 – 8) from three different builders. None of these was particularly acceptable. Before this testing was even fully underway the Electric Boat Company (later known as “Elco”) purchased a 70′ Vosper MTB from Britain. It was unusual in Britain’s desperate situation at the time to sell such a weapon to a private interest, but Electric Boat Company was well known to the Royal Navy having built 550 80′ launches for them in just over a year during the First World War. This boat was modified by Elco as their own design that became PT – 9. They won a contract for ten follow on 70′ boats.
Nomenclature for these boats was always a bit odd; the Navy seemed to consider the British term MTB an umbrella term for all such craft. Accordingly they were then organized into groups called MTB Squadrons (or MTBrons). Yet the US Navy’s specific boats were PT Boats.

Most prominent on the stern is the 40 mm Bofors. Meant for more serious anti-air. No doubt it was a capable gun and could dish out a lot of high explosive fire. Notice the fire restrictor to protect the forward part of the boat also has a barrel rest to take some load off the gun’s transport mechanism when bouncing around at sea.

The 70′ boat came to be considered too small and fragile for needs, but an improved 77′ boat was much more acceptable. 25 of these were built, and in the early Philippines Campaign they were the first PT Boats to see combat; including, famously spiriting Douglass MacArthur out of Corregidor for an airfield on Mindanao where he flew to Australia.
Size was however, still a critical concern with these 77′ boats. Elco and the Navy concluded a slightly longer boat would offer better sea keeping and make the boat a better weapons platform. The resulting 80′ Elco was slightly slower at 40 knots, but a great improvement in every other way. It displaced 56 tons and was powered by three 1200 hp Packard marine engines. Its basic armament started with four torpedo tubes; depth charges; two, twin .50 machine gun mounts; and a 20 mm cannon for anti-aircraft fire on the stern. It was fully expected the broad decks could support additional pedestal mounted machine guns or 20 mm cannon.
These are the boats that fought extensively around Guadalcanal and through the extended Solomons Campaign. Not only for patrolling the congested, contested waters but especially as barge busters. The Japanese were constantly moving troops and supplies between bases and islands with armed barges and amphibious vessels, PT Boats slugged it out with these little flotillas. They also saw extensive use as guides and protectors for a range of light Allied shipping. A popular upgrade proved to be 37 mm cannon pilfered from damaged Airacobras. In fact, this upgrade became so popular due to high rate of fire and actual armor piercing ability, that it was virtually standard by the end of 1942. PT-109 was the most famous of these early 80′ boats.

Another view of the rear quarter. The large tank starboard of the Bofors is a chemical smoke generator. It could spew out a pretty dense cloud for half an hour or so.

Elco would ultimately build 326 80′ boats. Although the major architecture never changed their were improvements. The most significant being more power from the Packard engine. Another 150 hp from each. This could add several knots to the top speed, but that was mostly offset by more armament. Especially since the boats were used more as small gunboats than actual torpedo boats. A major upgrade was replacing the stern mounted 20 mm cannon with a 40 mm Bofors. The 20 mm was moved forward, at centerline or offset. In the Pacific they never stayed front and center as this was the prefered location for the 37 mm cannon. Rocket launchers were added, eight tubes per side. This could unleash firepower equal to a destroyer’s broadside, at least for one salvo. Reloads were carried but couldn’t be accessed during combat.
Radar and improved radios were added, greatly enhancing the boats as scouts and for night operations. All these changes made weight an issue; so a new, much lighter, torpedo drop rack replaced the old style torpedo tubes. These could also carry depth charges, but this became an either/or proposition. Finally, in early 1945, the always popular 37 mm cannon became a standard factory fitting.

The 80′ Elco was THE boat for Pacific operations. Apart from the Solomons they were heavily involved around New Guinea. In these campaigns they caught the attention of the American Press and became known as “Mosquito Boats” or “Plywood Battleships”.
They were also scattered in little bases all across the Pacific, any place trouble was expected. There were also numerous temporary bases used, anywhere a tender might drop anchor. But the Philippines became the biggest campaign for PT Boats. With thousands of islands and hundreds of thousands of Japanese looking to delay and cause harm at every opportunity the little boats waged battle from October 1944 to the end of the War.

This particular boat, PT-491, was a fairly late build Elco that served throughout the Philippines Campaign. It’s most intense encounter came early in The Battle of Surigao Strait. Admiral Nishimura’s task force with two battleships came under attack from several groups of PT Boats. The most violent clash was with “Section 9”, three boats; PT-490 (“Little Butch”), PT-491 (“Devil’s Daughter”) and PT-493 (“Carole Baby”) [PT Boats almost never carried their name anywhere on the Boat, it was a crew familiarity only sort of thing]. The night of October 24/25, 1944 was a dark and stormy night (no really! It was!); Section 9 approached the Japanese via radar navigating through intense rain. They broke into the clear at 700 yards and immediately started their torpedo runs. They launched at 500 yards and promptly came under accurate fire. “Little Butch” was damaged and “Carole Baby” was badly smashed with two dead and a direct hit to the engine room. They scored no torpedo hits, only one torpedo boat might have scored a hit that night. As I said earlier, torpedo boats were actually not great torpedo platforms, way too unsteady at launch. But they contributed a lot to the confusion of the Japanese by coming at them, launching torpedoes and automatic weapons fire for over an hour, that badly fragmented the Japanese force prior to the destroyer attacks causing more meaningful damage.
Meanwhile badly wounded “Carole Baby” crept towards shore where its crew beached it. “Devil’s Daughter” was able to get the crew off before the wreckage was swamped by the rising tide. This made “Carole Baby”, officially, the last ship to sink in that epic Battle. For a more complete treatment of the battle see my review of “Battle of Surigao Strait” by Anthony P Tully; or even better, read the book!
I didn’t have any specific photos of PT-491 (or any boats in Section 9) so I simply went with a normal Measure 31 camouflage scheme. Having never built a boat before I realize I made a couple mistakes. The biggest just being that apparently the usual patterns of Measure 31 were all depicted on charts, whereas mine here is more random, oops. Secondly, although I found right away that the disruptive colors (Dark Navy Green and Black) were only applied to the vertical surfaces, I found out too late that the base color (Ocean Green) was also only applied to the vertical surfaces; the deck should be a slightly different Deck Green color. I was using three different sources (an older and newer Squadron/Signal book called “PT Boats in Action” and an Osprey book called “US Patrol Torpedo Boats”) only one of them mentioned this Deck Green color. Its not a noticeably different shade in black and white photos.

In pictures I’ve often seen the anchor line coiled in the open area at the bow. I chose to wrap it around the forward cleat because it looked cool that way… I probably just violated some boating code I know nothing about!

Which brings me to the kit. This is the Merit kit. It is modern, well engineered and well molded. Some parts, like the twin .50 mounts, are very fiddly and difficult. But overall there were no major problems apart from noting I’d never built a boat before. So I mostly followed the kit directions pretty closely. I deviated a couple times when I saw potential trouble; like the kit directions would have you attaching propellers and rudders in step 3. I knew those would get broken several times if I did that, so I left them off for last. I’m glad I did it, but it is fair to mention attaching them last was a minor headache; you can’t flip the boat over anymore with everything built up on top! So I wound up on the floor using a flashlight to look up for locating holes with the stern hanging off the edge of my model workbench. All things considered I’d call this a normal sort of modeling issue to overcome, it just emphasizes that building a boat was different!
I’d also comment the directions had no color call outs, just the one big color diagram of the finished model and a list of colors. So a lot more breaks for research (“now what color is that thing!”). Fortunately my new supplier of enamel paints (“True North”, wonderful paints) actually specializes in naval colors so my confidence level in major camo colors is very high, well apart from the Ocean Green/Deck Green thing. There was also no mention of the anchor line in the directions! Even though the anchor is beautifully molded with a line opening, the ship has the opening at the tip of bow for the line AND the ring on the steel bow plate for the line mount. This is a lot more obvious than antennae wires many modelers feel the need to put on airplanes! Its a rope cable! Not a big deal to borrow some fine twine from my wife’s craft supplies, just a funny thing for the directions overlook.

My previous experience with boats consists of the Schwimmwagon… Obviously not the same thing.
This might count better as previous boat experience…

Before concluding, and knowing I may never revisit any kind of boat, I should mention a few other things about the US PT Boat story. Although Elco boats were the most produced sort and the only sort in the Pacific (Elco boats could found at other worldwide bases too), the Navy concluded Elco could not meet all their needs. So Higgens Industries of New Orleans provided a second source with a unique proprietary design. Higgens was sure they could do better than any competitor so their 78′ boat owed little to any other design. It was comparatively more sturdy and maneuverable than the Elco boats but its overall seakeeping was inferior and Higgens crews could expect to be wetter most of the time. 209 Higgens PT Boats were built and they went through a similar progression with power and armament. Higgens Boats served in the Mediterranean, England and later Europe. In addition most bases in the Americas were patrolled by Higgens boats. And yes, this is the same Higgens Industries that is so well known for Amphtracs and a number of amphibious assault boats. Ironically, today most surviving PT Boats are Higgens boats; that may be because so many served in US coastal areas. Elco boats in the Pacific were mostly burned when the War ended; 121 of them in the Philippines.
But wait there’s more! Huckins Yacht Company of Jacksonville Florida also built 18 78′ boats to their own design. These were apparently the fastest and most maneuverable PT Boats, but also the most fragile. They served in Rhode Island, the Canal Zone and Hawaii (so no combat).
I’m not clear on the details, but apparently 70′ (or 71′) Vosper MTBs were also produced in the US for Soviet lend-lease. One such, that was finished after the War (and thus after lend-lease had ended) became “PT-73” for the TV show McHale’s Navy.

What the PT Boat and Airacobra have in common, the same gun in the most forward position!

Such small, fast boats have been used ever since too. Not with torpedoes anymore, but as gun and rocket platforms. They are typically conflict only type vessels, plywood boats are hard to mothball but cheap to build. And that last is the whole point.

How big is a PT Boat compared to a real ship like an aircraft carrier? Well, its a little hard to imagine 16 B-25s parked on its deck. Consider this the graphic for 56 tons vs 24000 tons.

About atcDave

I'm 5o-something years old and live in Ypsilanti, Michigan. I'm happily married to Jodie. I was an air traffic controller for 33 years and recently retired; grew up in the Chicago area, and am still a fanatic for pizza and the Chicago Bears. My main interest is military history, and my related hobbies include scale model building and strategy games.
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14 Responses to Elco 80′ Patrol Torpedo Boat

  1. Ernie Davis says:

    As you know I’ve been looking forward to seeing this build, and it doesn’t disappoint, despite your admitted mistakes (though I am pretty sure the anchor line around a cleat is a nautical no-no). I’ve always had a fascination for these boats, employing stealth and speed rather than slugging it out as so many other ships seemed to do. Oddly to the best of my knowledge the first real use of fast torpedo boats was the Japanese attack on Port Arthur at the start of the Russo-Japanese War, where oddly, the Japanese found their torpedoes to be less than reliable. Perhaps an early lesson.

    I believe the German E-boats were a bit larger with a fairly large (for the size) crew. Though I admit I don’t really know how large the American crews were (though I doubt they included a captured Japanese cook). I don’t recall a Japanese version in WWII, but I’m sure there must have been.

    • atcDave says:

      Crew size varied some, weapon fit makes a big difference. but 15 seems normal. E-Boats, which the Germans actually called S-Boats, were about twice the size with twice the crew. It’s not really a good one-to-one comparison. But I think that extra size was exactly what was needed to make the torpedoes more effective.
      I don’t know of anything similar NEW built by the Japanese, but they certainly had a lot of older torpedo boats. Many were converted into coastal patrol boats. And they built a lot of light gunboats for protecting inter-island and barge traffic. A lot of those are what duked it out with PT Boats. They were often heavily armed and even armored. Very different philosophy than their aircraft!

      • atcDave says:

        I did some double checking on order of battle stuff, and it does look like the Japanese just had a few dozen older torpedo boats. The sort that could rarely top 30 knots, carried two (older model) torpedoes, and had two or three machine guns. Obviously an area of major neglect for them. It is interesting considering the excellent next-gen sort of torpedoes they had.
        But they had a lot of armed and armored barges (Daihatsus)! 8 – 10 knot things that were built for shooting it out. Barge busting could be very dangerous work.

      • Ernie Davis says:

        I’d always wondered why you never seem to hear about Japanese torpedo boats, other than the actual piloted kamikaze torpedos. It does seem a bit odd given their apparent philosophy of the first quick devastating strike being both strategically and tactically important.

      • atcDave says:

        Especially since the torpedo boats were a big part of their victory over the Russians in 1905. They may have drawn their own conclusions though about smaller boats and torpedo accuracy. But they did put torpedoes on a lot of their bigger warships, even Heavy Cruisers. They converted a couple of Light Cruisers into ridiculously big torpedo boats. The Kitikami and Oi had all but 4 guns removed, and had 40 (!) torpedo tubes on deck. With reloads! Like destroyers on steroids.
        I think their barge gunboats were a sort of cheap expediency, but yeah it does seem unlike their normal way of doing things.

  2. Pierre Lagacé says:

    Very informative Dave and well researched. Thanks for having taken the time to write it all down as these boats have always fascinated me when I was watching WWII movies as a kid. Such courageous men!

  3. A very interesting write up Dave. These were remarkable little boats and could be quite devastating in their effect. One famous ‘pilot’ was of course John Kennedy on PT 109 (I had to look the precise details up https://www.jfklibrary.org/learn/about-jfk/jfk-in-history/john-f-kennedy-and-pt-109 ) which I’m sure you are more than aware of. I was more aware of the British used MTB through my own Airfix model from many years ago, and always had a liking of them as a result. The image of you on the floor with a torch is quite amusing!

    • atcDave says:

      It is funny how well known PT-109 is, anytime I mentioned I was building a PT Boat the immediate assumption was “you’re building PT-109”. Oh, and it would be grey!
      It wouldn’t shock me if a British MTB was released in 1/48 someday, obviously a very similar boat. That’s about the only way I could see building another boat! Even an E-Boat would be enough bigger to be unlikely.
      It was funny to be reduced to crawling on the floor! I’ve already bled for my hobby, now I’m floored by it!

      • Ernie Davis says:

        Those X-Acto knives are sharp. Fortunately Crazy Glue was originally developed for medical purposes.

      • atcDave says:

        Oh yeah X-Actos are sharp! Crazy Glue is kind of scary. I’ve had a few bad experiences with it, even wondering if was safe to cut fingers apart. Funny I’ve always decided no!

      • I can imagine it’s often said and assumed, so it’s nice you’ve built something else and included its history too.

      • Ernie Davis says:

        Nail polish remover works. Fortunately I have both older and younger sisters so I was covered.

      • atcDave says:

        I did want to do something a little different, and green.

        Yes I’ve learned about the miracle of nail polish remover!

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