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Patrick Matthews


Product designer

R/C Model Boater!

1:24 scale 20mm Oerlikon Pedestal, Late
patmat2350 @1walt Sorry, I don't have the design tools to do "soft" items... look up my buddy Holden8702. Pedestal- this one is 1-5/16" tall in 1:24... and very close to 1-1/16" diameter (not counting the foot rests). It looks right to me, while another 9/16" height would seem like too much. Until I get to touch and measure a real one in person, I'll remain dubious of all drawings.
Mk18 Torp Tube Breech Set 1:20
patmat2350 @mechwerkandi No, the tube is not much bigger, it is thin wall steel... about 1/4" [6.3mm]. Your reference is a secondary source... I have the original Elco torpedo tube drawings. The actual inside diameter of the breech collar is machined to 21.41 inch... 27.2mm in 1:20 scale... actually slightly smaller than the (approximate) tube outside diameter I mentioned below. Regardless, these parts are sized to fit 3/4" PVC pipe, which is commonly used by modelers for 1:20 scale PT boats.
patmat2350 @mechwerkandi Yes really. The actual tube outside diameter was 21.75 inch; /20 = 1.088 in = 27.6mm. 3/4 inch PVC pipe is used in the Dumas 1:20 kit; it has an OD (outside diameter) of 1.055" = 26.8mm. For R/C use, I highly recommend using thinner material, as the PVC pipe is quite heavy. I used a lathe to bore out the PVC pipe, and removed about 1 kg. with four tubes.
Check out my latest big propeller! - Propeller 3.33" RH, for 1:6 scale Monterey Clipper


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