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Author Topic: Balao length  (Read 2530 times)
drew
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« on: April 12, 2016, 09:50:48 PM »

311 9+1/16

Thanx to having the plans on line I can see
http://www.hnsa.org/wp-content/uploads/2014/08/ss298.pdf

Let's make it a Balao :-) - Jim
« Last Edit: April 18, 2016, 03:01:13 PM by Jim » Logged
drew
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« Reply #1 on: April 12, 2016, 10:07:39 PM »

Hmmm, hitting tab strangley sent my previous message before I was done, and all I wanted to do was indent a line.

So, the plan drawings list the length as 311ft, 9+1/16 inches.
Then the length between perpendiculars is listed, no clue what that refers too.
There is a scale on the drawing, where the boat looks about 139 scale units. Strangely the bow doesn't line up with zero on the scale, but hangs out before the scale starts.
If the scale units are yards, the the boat is 3*139=417 feet long. Which is a big difference compared to about 312 feet.

I wanted to use the drawing to figure out what the length was from the crews berth head to the bow or stern. I guess it would be safer to use a tape measure.

The actual blueprint (if it was correct size) wold give me good answers becaus the scale is listed as 1/8" to the foot.

http://www.hnsa.org/wp-content/uploads/2014/08/ss298.pdf
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Gil Bohannon
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« Reply #2 on: April 18, 2016, 08:59:23 AM »

The numbers on the drawings you are referring to as "scale units" are actually frame numbers, denoting the hull frames.

Gil
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drew
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« Reply #3 on: April 18, 2016, 09:06:49 PM »

Hi Gil,

I don't think I would have ever connected the numbers on the drawing with the frame numbers. That is very useful to know.
I have noticed frame numbers on a few bulkheads but never thought the would be of any use to me.

Thanx for helping me out.
Drew
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Ctwilley
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« Reply #4 on: August 21, 2017, 10:35:45 PM »

One thing to keep in mind is that every boat was a smidge different. The SS310 (Batfish) was 311' 9-9/16".

Thankfully, I have an original General Information Book for our boat.
Here are our specs.

Length: 311' 9-9/16"
Length Between Perpendiculars: 311' 1-9/16"
Length of LWL (Condition N): 307'
Beam, Extreme (12 feet AB): 27' 3-1/4"
Beam, Molded (12 feet AB): 27' 1-3/4"
Depth, Molded Amidships, FR 69: 22' 11-3/8"
Freeboard at Bow (Condition N): 12' 6"
Freeboard at Stern (Condition N): 6' 8-5/8"
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pekelney
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« Reply #5 on: August 24, 2017, 08:43:44 PM »

Note that the frames are not all the same distance apart.

If you are modeling and want more info than a booklet of general plans, see also:
https://maritime.org/tech/drawings/#lines

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