Jump to content

Scaling Down From The Original Specs Can Be Fun


Julie Mo

Recommended Posts

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 :o

Sail area - 7,651 ft2 / 35 = 219 ft2  :o 

 

I'm going to need a lot of lead and a whole lot more canvas! :rolleyes:

 

How does your model size up?

Julie

 

First and only build: Endeavour - 1934 American's Cup, UK Challenger, J-Class - Amati 1:35

Link to comment
Share on other sites

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

 

====================================

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!

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...