Dumas 1:20 scale PT Boat Upgrades

Looking for upgrade weapons for your Dumas PT-109 kit? The 48 inch-long 1:20 scale model? Something more than wood dowels for machine guns? And you’re bummed that neither HR Products nor Mosquito Boat Hobbies’ aftermarket offerings are available anymore?

Well, I have a number of detailed weapons available as 3D-printed kits at Shapeways, in my Matthews Model Marine shop:

Each has a detailed instruction document, available to download from my store.

The weapons are also available in 1:24 and 1:16 scale, and can be further scaled up and down as required… except, I usually can’t offer 1:48 or 1:35 and smaller, as many details on these models are already at their smallest printable size in 1:24.

The material used for most of these parts is Shapeways’ “Frosted Detail”, which is a UV-cured acrylic plastic. Please see my document Working with Shapeways’ “Frosted Detail”, posted at my Shapeways shop.



Breech door assembly for Mk 18 torpedo tube.


50 caliber Browning machine gun sets, available with ammo belts.


Cowl vent hoods… make the rest of the vent with tubing, easy.


20mm Oerlikon, also available on the new lighter tripod mount.


The famous 37mm cannon liberated from Army P-39 fighters.


40mm Bofors single


Filed under Model Ship Building

2 responses to “Dumas 1:20 scale PT Boat Upgrades

  1. Ken

    Hi trying to find a 1/20 model of pt 109, do you have any place I could buy this , assemble or not, would also like to buy your upgrades,thanks

    • matthewsmodelmarine

      Dumas discontinued the 48″ 1:20 PT kit some time ago. Your best hope is to keep watching ebay, they sometimes come up. Or scratch build from plans. PM

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