Julie Mo Posted November 28, 2015 #1 Posted November 28, 2015 I'm working on a 1934 J-Class sailboat at 1:35 scale. I already knew the LOA and beam of the model were scaled correctly but watching a RC video of J-Class racing, I noticed an unnatural movement of the boats. So for grins, I decided to take the original specs on the 1934 Endeavour and divide them by 35. LOA - 129' 6" / 35 = 44.4" Beam - 22' / 35 = 7.5" Displacement - 143 tons / 35 = 8,171 pounds Sail area - 7,651 ft2 / 35 = 219 ft2 I'm going to need a lot of lead and a whole lot more canvas! How does your model size up? Julie First and only build: Endeavour - 1934 American's Cup, UK Challenger, J-Class - Amati 1:35
justsayrow Posted November 28, 2015 #2 Posted November 28, 2015 Julie, I have good news for you - you won't need 4 tons of lead! The scale factor is only linear for linear dimensions (length, beam, depth, draft). For volume dimensions, you cube it (35x35x35) for a value of 42,875. 143 long tons is 320,320 pounds. 320,320 / 42,875 about 7 1/2 pounds of displacement. For reference, 8,171 pounds of seawater requires displacement of 127 cubic feet, or a box roughly 5 x 5 x 5 feet square to be neutrally buoyant. Similar for the area measurement, you square the factor. 35x35 is 1,225. 7,651 ft2 / 1,225 is 6 1/4 ft2. Much more do-able! R/ Jerry Canute, avsjerome2003, Julie Mo and 1 other 4 ==================================== Currently building: Model Expo AMERICA, A/L KING OF THE MISSISSIPPI Completed: Mamoli Victory cross-section, Revell LSM (Plastic, in memory of Dad), A/L SANSON tug, MS Longboat (awesome model Chuck!), Dumas 1949 Chris-Craft 19' Racing runabout, A/L SWIFT, MS ELSIE, Constructo ELIDIR (now LOUISE), Midwest Muscongus Bay Lobster Smack, Amati 1:80 Yacht ENDEAVOUR, Mamoli CONSTITUTION cross section, Revell VIIc U-boat (1:72 plastic), lotsa other plastic ships Next up: who knows - there are too many to choose from!
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